I have a 2000 Dodge Ram 1500, 4x4, 5.9l with a 46RE Transmission. I have been fighting transmission electrical issues for awhile and I am just about at my wits end with it. I was able to drive just fine but had to manual shift (1st, 2nd, D), but it would not go from 3rd to 4th while in drive.
Started with these codes:
· P1762 – Governor Pressure Sensor Offset Volts High or Low
· P0753 – 3-4 Solenoid Circuit/Transmission Control Relay Circuit
· P0121 – Throttle Position Sensor, Performance
I changed the Shift Solenoid ( WELLS 2N1202) and then ended up with:
· P0753 – 3-4 Solenoid Circuit/Transmission Control Relay Circuit
· P1756 – Go. Pressure not equal to target @ 35-40 PSI.
Noticed that the wires going into the 3 pin plug on the side of the transmission had no shielding left, so I replaced that plug and then got:
· P1762 – Governor Pressure Sensor Offset Volts High or Low
I also got 4th gear back while in drive.
I replaced the 8 pin plug just grasping at straws and that did not change anything.
Here is where it is getting frustrating. I replaced the pressure sensor (ROSTRA 501171) and the 1762 went away, test drive I got 1st and 2nd back while in Drive, then check engine light came back on after about a minute with a P0748 – Transmission Control Relay Circuit/Governor Pressure Solenoid Circuit and no more 1st, 2nd, or 4th gear in drive.
Swapped back to the original sensor, thinking maybe the new one was either wrong part or bad. Back to the P1762 code.
I just changed the sensor again, this time the ROSTRA 501017, and same issue as with the other sensor, works for about a minute, check engine light and then back to just having 3rd gear while in drive.
I have also cleaned the ECU plugs with contact cleaner and reset the ECU by disconnecting the negative battery cable and holding the key on for 30 seconds.
Next steps I can try are:
· Replacing overdrive relays / internal 8 pin.
· Pulling the transmission and rebuilding with full electronics replacement.
· Just getting a replacement transmission.
· Crying softly to myself.
I also read somewhere that the Transmission Control Relay Circuit/Governor Pressure Solenoid Circuit gets 5 volts from the O2 sensors, if this is true, I can change those and hope for the best as well.
Any advice or help right now would be amazing!