r/G37 Jan 31 '22

G37 common issue thread

446 Upvotes

Edit3: Sunroof drain leak info overhaul. Thanks u/p3dal.

Edit2: Update to v2. Fixed formatting. Updates include difficulty level, service intervals, electric steering lock issue.

Edit1: Format fixes

Hello everyone! I figured I'd compile this thread for anyone thinking of buying a g37 or anyone that already has one and wants to know more about their car. If anyone has any input or catches any typos please let me know!

Technicals Service Bulletins (TSBs)

Refer to this pdf for a list of TSBs. If you're having an issue, you may just find it here. https://infinitig37.com/Infiniti-G37-Technical-Support-Bullitins.html

Service Intervals

Please refer to the Infiniti Service and Maintenance Guide and Factory Service Manual (FSM). I'll drop my recommendations here, which fall between the severe service schedule and the less severe service schedule.

  • Every 5000 miles/8000 Km or 6 months
    • Engine Oil(5w30) and Engine Oil Filter
  • 10,000-15,000 miles/16,000-25,000 Km or yearly
    • Cabin Air Filter
    • Engine Air Filters
  • 30,000-40,000 miles/48,000-64,000 Km or 3 years
    • Manual transmission(GL4 75w85)
    • 5 speed auto(matic J or matic S ONLY)
    • Brake/Clutch fluid(DOT 3 is the minimum but I would use DOT 4 or DOT 5.1 especially for the clutch. Do not use DOT 5)
    • Differential(GL5 75w90 or GL5 80w90. SAE 90 can be used in temps above 32 degrees)
  • 50,000-60,000 miles/80,000-96,000 Km or 5 years
    • Transfer case fluid(matic J or matic S ONLY)
    • Coolant
    • Replace Radiator Cap
    • Serpentine Belt and inspect tensioner and idler pulleys and idler pulley bearings. I found my tensioner went around 100k miles. Idler pulley bearings are still good though at 120k.
    • 7 speed auto(matic J or matic S ONLY and note this is "lifetime fill" and a bit of a pain to do at home)
    • Power Steering(DEXRON VI)
  • 80,000 miles/130,000 Km
    • Replace Spark Plugs(Denso FXE24HR11 or NGK DILKAR7B11)

Common Issues

Priority Levels:

  • High: will leave you stranded
  • Medium: will eventually leave you stranded
  • Low: will not leave you stranded

Repair Difficulty Levels(note this is completely subjective):

  • 0-1: You can do this job easily with basic hand tools and the car on the ground
  • 2-3: This job may take a little bit longer and you most likely will need to lift the car. No specialized tools needed.
  • 4-5: This job is a pain and I recommend a shop. Still accomplishable in your garage but may need better tools than you have and you'll want a lift

Slave cylinder failure(manual transmission only)

Priority Level: High

Difficulty: 4(alot has to come off and the transmission is quite heavy)

What? - The slave cylinder for the 6mt G37 and 370z is a concentric slave cylinder(CSC) meaning the release bearing and slave cylinder are the same part and located inside the bell housing. This part has a plastic housing that leaves it susceptible to failure leading to sudden loss of clutch pressure.

When? - Failure tends to happen rather suddenly, usually somewhere at or past 80,000 miles/130,000 Km, but not unheard of as early as 40,000 miles/64,000 Km.

How do I check? - If clutch fluid is being lost, the CSC is likely to blame. If clutch fluid is excessively dirty(it should be light, transparent yellow in color) expect problems sooner rather than later. If the reservoir is empty and there is no leak from the master cylinder(which would likely show up as clutch fluid on the driver side carpet), the CSC has likely failed.

Preventative Maintenance - Regular clutch fluid changes. - RJM's clutch pedal claims to help.

Upgrade Options - ZSpeed's CMAK is the best conversion kit on the market that moves the slave cylinder outside the transmission into a slave cylinder, fork and release bearing setup. Z1 makes a similar kit but it requires frequent adjustments and is overall inferior. - Pretty much every Nissan performance storefront sells an upgraded CSC including but probably not limited to Z1, Zspeed, and ConceptZPerformance. I have no experience with these and overall recommend the CMAK.

Important Notes - If the slave cylinder fails it's likely to take your clutch disc with it. - If the slave cylinder is changed, the master cylinder should be changed as well.

Differential(Diff) stud bushing failure

Priority Level: Low

Difficulty: 3(quite a bit has to come off, getting the bushing out is tough)

What? - The differential bushing for the G37 and 370z is a partially fluid filled bushing. While this is exceptional for preventing NVH(Noise, Vibration, and Harshness), it has a tendency to pop and allow excess movement of the differential.

When? - Incredibly early, as early as 20,000 miles/32,000 Km. Tends to blow out quicker on vehicles with the manual transmission

How do I check? - Brownish-Black fluid leaking form the bushing, on the diff, on your exhaust. It's pretty messy. Alternatively, jack the car up by the diff and if the diff moves freely up and and back down, the bushing is blown

Preventative maintenance - Not much you can do other than drive like a grandma. A differential brace could help, see notes.

Upgrade options - The OEM does not sell an individual replacement, though you could buy the whole rear subframe with the bushing pressed in. This is not recommended. - Poly bushings from whiteline, z1, energy suspension, gktech, superpro, etc. - Solid bushings from SPL, z1, gktech, etc. - It's possible to refill the bushing with silicone. While this maybe isn't the best route to go, it's been proven to work just fine by motorvate(video) and is probably the best option if you're looking to be as close as possible to OEM NVH. Important Notes - A diff brace will keep the diff still but shouldn't be fully relied on. They may help prevent bushing failure too. Multiple options from z1, Bell, or gktech.

Heater hose connector/splice/coupler failure

Priority Level: High

Difficulty: 2(requires tools, small space)

What? - A plastic hose splice is used to connect to the heater core on the G37 and 370z, it is located close to the firewall on the passenger side. With age, this plastic coupler can fall apart and leak significant amounts of coolant.

When? - Sometime around or after 100,000 miles/161,000 Km is most likely. Most G37s sold today should probably have this replaced right away.

How do I check? - Check for low coolant level in reservoir, look for crusty coolant at the coupler(Green or blue). Look at this coupler first if you've lost most of your coolant or you're smelling coolant(sickly sweet smell)

Preventative Maintenance - replace with upgrade.

Upgrade Options - Any 3/4" ID(inner diameter) hose splice/coupler should work just fine. I recommend switching to a metal one like this or if you want to pay out the nose the Z1 option. - OEM plastic part(not recommended)

Important Notes - If you're replacing this, you should do the hoses too. This hose and this hose. Z1 does offer nice silicone hoses for this application.

Rear Timing Cover Oil Gallery Gasket Failure(Pre 2012 models)

Priority Level: Medium

Difficulty: 5(you'll need drain the A/C, getting the crank pulley off may require an air tool, may have to reset timing)

What? - Behind the timing chains on the 370z and G37 there are two oil galleries that have gaskets poorly torqued from the factory. This causes the gaskets to blow out and instead of oil going where it should it will seep back into the oil pan.

When? - It's been a really mixed bag. Mine blew sometime before 80,000 miles/130,000 Km. Most of what I've read is the problem will reach high priority by about 125,000 miles/200,000 Km.

How do I check? - Check oil pressure: At warm idle, oil pressure should be greater than 14 PSI; At warm 2000 RPMs, oil pressure should be greater than 43 PSI. Engine Codes # P0011/P0021 usually point to gallery gasket failure. Finally, gasket material in the oil pan is a certain failure.

Preventative Maintenance - It probably helps to keep revs down when oil is cold as pressure is highest when oil is cold, but really there's not a ton you can do.

Upgrade options - Replace with OEM(Check this myG37 thread for more info) - EPS has a kit that I've heard has the best fasteners of the bunch. z1 has a kit but I've heard mixed things about the fasteners. ConceptZPerformance has a kit that looks about the same as z1s - Important Notes - This job needs a bunch of seals to do right. z1 and conceptzperformance have kits that bundle the OEM seals. - Replace water pump and inspect timing chains/tensioners are part of this job as well.

Sunroof Drain Leak

Priority Level: LowVery High

Difficulty: 0(no tools required)2-3(depends on action taken)

What? - Sometimes the sunroof drains on the G37 will get clogged, or the plug leading out of the car will leak from it's gasket. This will cause damp floor mats/carpet or pillars/headliner and can seriously damage electrical components such as the fuses box and the BCM

When? - No specific mileage, heavily dependent on when you drive and where you park.

How do I check? - On either side of the vehicle, if you pull the vents out you can see the hoses and plugs that lead out of the car, check for dampness. Additionally, if clogged, it's possible the leak comes directly from the sunroof because the hose pops off. If anything smells or looks wet take action immediately

Preventative Maintenance - Park in garage, blow out sunroof drains, check occasionally for dampness.

Upgrade Options - Add clamps to upper sunroof hoses(they are not clamped to sunroof barbs from the factory). - Replace [firewall] plugs](https://parts.infinitiusa.com/p/INFINITI__/Plug-Side~-Trim/89790203/74816-JU40B.html) if the gaskets are worn and leaking.

Important Notes - If left unattended this issue could cause serious water damage to the floor plan as well as, more importantly, soaking the BCM or driver side fuse box.;

Per u/p3dal;

I don't agree on this one. The priority is pretty high, as left unattended it can result in mold, or damage to the engine computer (passenger side) or fuse box (driver's side) , which the sunroof drain frequently drips on when it is clogged or leaking. The damp floor mats are the right symptom, but they're not what you should be concerned about. By the time your floor mats are damp, you might have 2" of water in a channel/compartment under the passenger side floor carpet.

Also, there are two popular solutions to fixing it, which are not the same as above. The firewall drain plug is defective by design, and replacing it will often result in the same issue showing up again a few years later. Replacing the sunroof drain firewall plug is extremely difficult and often requires removing either the dash or the windshield. I've heard dealerships charge $800-$1200 to replace this $4 part. Though some people can pull it out with 16" plyers, plenty more cannot reach it at all. These alternative fixes are much better solutions:

  1. This solution involves extending the drain to drip on the other side of the firewall. I've not tried this solution, but some people seem to like it: https://www.reddit.com/r/G37/comments/teej1l/fixed_my_damn_sunroof_leak_finally/
  2. In my opinion, the sunroof drain bypass is the better fix, and removes the firewall, grommet, and plug from the equation entirely. https://www.myg37.com/forums/body-interior-exterior-lighting/280987-passenger-side-dashboard-leak-4.html However, I've only done this on the passenger side, and I'm concerned the driver's side drain might not be as simple. Option 1 might be better for the driver's side. Reminder, I will always make my best effort to ensure the accuracy of this post so please comment about anything you disagree with or have better suggestions for

Dirty throttle bodies

Priority Level: Low

Difficulty: 1(requires tools)

What? - This is more of a tune-up item but G37s and 370zs seem particularly sensitive to dirty throttle bodies. This often presents by allowing the car to start then immediately shutting off.

When? - The general consensus around the forums seems to be at around 30,000 miles/50,000 Km

How do I check? - If you're having idle issues or the engine shuts off right after starting when warm, it may be the throttle bodies

Preventative Maintenance - Clean the throttle bodies of carbon every once and a while and perform an idle relearn.

Upgrade Options - catch cans with filter media should help but legality varies by location

Electric Steering Lock(applies primarily to 2009/2010 models)

Priority Level: Medium

Difficulty: 2(may need tools you don't have)

What? - The electric steering wheel locks on G37s and 370zs can lock up and not let go, making the car unable to start. Specific TSB here under NHTSA Reference #10051829

When? - No specific mileage

How do I check? - Your car randomly will not start but otherwise was just fine before

Preventative Maintenance - See upgrade options

Upgrade Options - Replace with OEM part - Replace with Dorman 601-037 , which is supposed to fix this entirely. - Pull fuse to ESCL - Bypass wire to ESCL

Important Notes - If your car is actively having this issue, you probably can get it to start by wailing on the bottom of the part with a mallet and getting the car started. Immediately bypass when car is started.

Other issues worth mentioning

  • The rear end links break relatively quickly if you're dropped or run stiffer sway bars, or both. Adjustable end links are available from whiteline and SPL. HOWEVER, online discussions appear to point to white lines being lower quality than OE and susceptible to failure. With what we know now, I would truly only recommend SPL or OEM.
  • The rack and pinions tend to seep a bit earlier than other cars in my experience. Also worth noting, the rack preload bolt WILL usually be a bit leaky. This is normal. Seeping does NOT mean replace, refer to the TSB on the rack and pinions if you are not sure. Stay on top of fluid. Replace ONLY with OEM/Hitachi or reputable rebuild (such as having yours rebuilt). Most remans are junk.
  • The wire bundle going between the trunk and trunk lid gets fatigued after a while and wires will eventually fray and break.
  • Multiple nissans have issues with the fuel tank senders. It isn't a big deal but your fuel level on the dash won't be accurate. Can also give you check engine lights for fuel level issues. Unfortunately, our cars have a level sender in both the driver side and fuel pump on the passenger side. You can test the resistance with a multimeter and sweeping the fuel arm but it's pretty moot and may be hard to see. Cleaning the contacts of the wiper can fix it and is worth a shot if you can't afford parts.

r/G37 Aug 24 '24

Stop posting your license plates and pictures of your addresses.

81 Upvotes

If you don't want to be like the other people here screaming "buy a killswitch!" and "get a tracker!", stop posting pictures of where you live with your car and how to find you. Thieves aren't dumb, they're looking for you!


r/G37 18h ago

I hate these cupholders so much

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38 Upvotes

So I stupidly let may parents use my car and they decided to close my cupholder for some reason. Anyone with the insert know how to fix this without having the take the whole middle console apart? It wont open all the way, but it does close


r/G37 11h ago

trying to move on from the clapped out black painted stocks, what are some rims you guys think would look good?

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7 Upvotes

r/G37 11h ago

Aftermarket Taillights recommendations and pictures ?

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6 Upvotes

As yall can see one of my taillights isn’t working fully, and I’ve been told it’s the whole taillight that needs to be replaced since it’s going out , but I’ve been thinking about getting aftermarket’s or keeping OEM, can yall show me some of yalls and what they’re called


r/G37 2h ago

Christmas tree dash , any help?

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1 Upvotes

Just yesterday and today, 2 more lights came on my dash. The traction light, like when it’s slipping (but it’s solid illuminated) and a flashing airbag light. When I do a pull, the BRAKE light comes on too but then goes off when I stop accelerating. I’m in florida, and it’s been raining a lot. Could this be my BCM? i had issues with it last year. I haven’t had a chance to run the codes yet. Any help would be appreciated! Thank you!!

2012 g37 journey


r/G37 10h ago

Would it be a fuel issue or something else?

2 Upvotes

I fixed the gallery gaskets, replaced the timing chain, valve cover gaskets, thermostat, water pump, and after all that it’s still cutting out on acceleration. It was just running perfectly fine until I put gas (91) in and then the engine light came on and it started sputtering like it would if a MAF sensor went out. Has anyone else had this issue? Or would it be a wiring issue? It’s the 2nd time that has happened after I put gas in, I fill it up and it cuts out like sputters on acceleration. Please someone help if they can.


r/G37 1d ago

A few recent pictures

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131 Upvotes

r/G37 11h ago

I Need Help fixing my G37

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2 Upvotes

2013 Infiniti G37 Sedan – Intermittent Electrical Issue. Gauges, Cooling Fan, and Wiring Harness? Need Help Diagnosing
I’ve been chasing an electrical issue on my 2013 Infiniti G37 sedan and I’m hoping someone has seen this before.
The biggest clue is that if I move a certain wiring harness/wire around, everything suddenly starts working again. If I let it move back, the problem comes right back.
Symptoms:
Gauge cluster will randomly stop working.
Cooling fan won’t come on when the issue is happening.
As soon as I move the wire into the right position, the gauges immediately come back to life and the cooling fan turns on.
I’ve literally driven while holding the wire in a certain position just to keep everything working.
The problem is 100% repeatable depending on the position of the wire.
I’ve attached pictures of the exact wire/harness I’m talking about.
At this point I’m trying to figure out if this is:
A broken wire inside the insulation.
A loose or damaged connector.
A bad ground.
A common G37 wiring harness issue.
Or something else entirely.
I don’t have a lot of experience with automotive electrical diagnostics, so if anyone recognizes this harness or has dealt with the same issue on a G37 or 370Z, I’d really appreciate any advice.
What would be the proper way to diagnose this? Is there a common failure point I should inspect first, or should I start by checking continuity on each wire in the harness?
Thanks in advance for any help

(THIS IS THE BACK BEING THE PASSENGER SIDE)


r/G37 22h ago

Pic of mine from the wildfire smoke

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14 Upvotes

r/G37 8h ago

2009 G37 hard top convertible won’t close

1 Upvotes

I inherited a beautiful 2009 Infiniti G37 hard top convertible, 2 door, with only about 70,000 miles on it. The previous owner told me that the hard top didn’t work but when I tried it, it worked flawlessly (after I removed the crap in the trunk preventing the flippers from popping out properly). I’ve had it up and down a couple of times since then.

I had to replace the battery last week, and then took it into the dealership for some repairs (alignment, rear brake replacement, oil change) and before parking at home I took the top down to make it easier to back into the garage. It got stuck on the way down (I wasn’t completely level when I hit the button) but once in the garage I was able to get it to complete the down cycle.

I am getting no response on trying to close it. No movement from the hydraulics, no acknowledgment on the dash that I have requested to close the top. I’ve turned it off and on, driven it for a bit, tried again. Nothing.

Any suggestions?


r/G37 9h ago

Any quick fix to busted door lock/handle?

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1 Upvotes

Some idiot tried to break in my car. The lock and handle still works but the window will get jammed going down time to time. Don’t want to keep spending too much money on this car so anyone got some cheap ideas to fix or hide it?


r/G37 1d ago

What would be a fair price for this g

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18 Upvotes

I'm looking at a 2015 Infiniti Q60 with about 105k miles. It's a one-owner, completely stock car with a clean title, and the interior looks extremely clean from the photos. The seller has it listed on Facebook Marketplace for $14,500, which seems expensive to me.

Assuming everything checks out mechanically and the Carfax is clean, what would you guys consider a fair price for this car? Is $14.5k anywhere close to reasonable, or is it overpriced? I'd appreciate hearing what you think it's actually worth in today's market.


r/G37 18h ago

I hate these cupholders so much

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3 Upvotes

So I stupidly let may parents use my car and they decided to close my cupholder for some reason. Anyone with the insert know how to fix this without having the take the whole middle console apart? It wont open all the way, but it does close


r/G37 21h ago

Can someone guide me to the right direction! Gallery gasket !!

2 Upvotes

I just want to save some time and stress of removing the crank bolt, best tools to do it? Any budget, can do a fuel impact wrench, whatever, I hear about a heavy 19 mm socket and stuff, can someone that already suffered that can guide me !! Im using the EPS tuning kit for the gasket and hardware


r/G37 21h ago

DIY alignments for lowered vehicles

2 Upvotes

I’m finding that normal shops can’t do alignments and I once tried a Gyraline tool but I wasn’t too confident in its results and how it was changing numbers constantly. Does anybody have a good DIY alignment solution?


r/G37 17h ago

G37x awd tire setup.

1 Upvotes

Currently running 255/40/19 in rear and 245/40/19 up front but I keep having the issue where my awd light keeps popping up after a couple miles of driving it was fine for about a week….I’m wondering if I have to run a squared setup on awd to fix my issue…..I’m currently have the sport 19s off a coupe if that matters


r/G37 18h ago

Exhaust opinions on noise

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1 Upvotes

So i have a coupe with 4was system, so my options are very very limited. keeping stock cats, I think im going to go with the z1 resonated single exit with resonated y pipe. Is this setup way too loud? way to raspy? or way to drony? all people talk about is un resonated isr single exits


r/G37 18h ago

I’ve had this p0420 code and no p0430 code when i slapped on my test pipes but now over the course of a 3 years i’ve got a p2098 code come up has anyone had this same issue

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1 Upvotes

r/G37 1d ago

Hex Retrofit Headlights

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5 Upvotes

Hey, does anyone know what size these hex halos are and where to get them? Everything is overpriced so I’ve just accepted my faith and decided to retrofit my headlights myself.


r/G37 1d ago

G37 oil pressure in spec, but oil gallery gasket has failed! w/pics

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71 Upvotes

On my 2011 G37 at 224,000 Km / 140,000 miles I noticed my engine oil pressure was lower than usual.

At the beginning of June it was 19 psi at hot idle (80C / 176F)

By the end of June it dropped to 15 psi.

The only reason I could think of was the oil gallery gaskets failing, so I decided to have a look, even with the car running perfectly and didn't have any codes.

As it turned out, they had failed and I'm happy I caught this before bearing damage.

If you don't have an oil pressure gauge, you may want to get one - it just may save your engine!


r/G37 1d ago

2010 G37 Bluetooth choppy connection

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2 Upvotes

I think I have found the solution…I’m not saying this will fix the chop for all your cars (hopefully) but I recently upgraded my cell phone from a IPhone 14 Pro Max to a IPhone 17 pro max after the switch and I connected my new phone to the car the choppy connection hasn’t came back. IDK what technology Apple implemented into the 17 but aye ✊🏽it helped….when I start my car it connects no issue and plays where i left off!!!


r/G37 1d ago

Am i cooked? 2013 G37x Sedan

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4 Upvotes

I was driving normally and suddenly felt a vibration in the motor when accelerating, Service engine came on n off flashing then went off completely for a bit then decided to return again. Waiting to borrow a scan tool from a buddy but has anybody had this problem?


r/G37 1d ago

Can someone please tell me what this leak is?

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6 Upvotes

This is located below the valve cover gasket and above the cylinder head. I have no idea what this gasket would be called. It’s leaking oil bad. Thank you.
(This is on driver side)

UPDATE: after an hour of research it is called the VVEL ladder. It’s a layer of RTV. Unfortunately this will be a costly job. I’ll update on the exact dealer quote tomorrow or when I get it.


r/G37 1d ago

Anyone know this noise

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0 Upvotes

Drove a while and after I came back from driving whenever I was just moving, not even accelerating, it was making this noise, I believe it would be a wheel bearing hub, but let me know