Question about Jeep Grand Cherokee

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1994 Jeep Grand Cherokee, Overdrive stoped working, Replaced the Overdrive sensor in Transmission but overdrive still wont work. What the next step?

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  • alan_jobe200 Jul 23, 2009

    1994 Jeep Grand Cherokee, Overdrive stopped working, Installed a new Overdrive silonide, But overdrive still wont kick on (Overdrive is stuck in the off popsition. Rpms at 3grand @ 50 MPH

  • alan_jobe200 Jul 23, 2009

    1994 Jeep Grand Cherokee, Overdrive wont kick in. I have replaced the overdrive Siloind in the transmission, Still wont kick into overdrive.

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A bad crankshaft position, a bad Throttle Position Sensor (TPS), or a bad input speed sensor (located on the left side of the transmission) can cause the overdrive to not work. Generally I see the TPS fixing the problem. You should first try to get the trouble codes off of this jeep as they can help narrow down which sensor might be failing. The method to getting the codes is below. Otherwise replacing each one, one by one is what you might end up doing. Let me know how this turns out.


To get codes out of the Transmission Control Module (TCM). The lamp in the Overdrive OFF switch is used to signal the various flash codes. To view flash codes, proceed as follows:

  1. Turn ignition key ON-OFF-ON-OFF-ON finally leaving the key in the ON position. Leave the Overdrive OFF Switch in the normal overdrive (ON) position.
  2. Immediately begin counting the number of flashes displayed by the Overdrive OFF Switch indicator lamp.
  3. Flash codes will correspond to Powertrain Control Module codes in duration and spacing.
  4. A code 55 identifies the end of flash code transmission.
And the possible codes are:

  • 11 No Engine Speed Sensor Signal
  • 12 No Output Shaft Sensor Signal
  • 13 No Vehicle Speed Sensor Signal
  • 14 Governor Pressure Sensor Signal
  • 15 Throttle Position Signal
  • 16 Transmission Temperature Sensor
  • 17 Overdrive Off Switch Circuit
  • 18 System Voltage Out of Limits
  • 19 Standby Voltage Out of Limits
  • 21 Governor Pressure Solenoid Circuit
  • 22 3-4 Solenoid Circuit
  • 23 Torque Converter Clutch Circuit
  • 24 Overdrive Off Lamp Circuit
  • 25 EEPROM Checksum Error
  • 26 Governor Pressure Sensor Offset Drift
  • 55 End of Message
If you still get no codes, then we have to explore a mechanical problem inside the transmission. Possibly the overdrive solenoid not venting or a lower valve body malfunction.



Benjamin

Posted on Jul 24, 2009

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HI. i recommend replacing the overdrive relay and OD switch on the shifter as well. these are the most overlooked problem areas. The overdrive circuit is controlled by the engine temperature sensor, as well, to prevent it from going into overdrive when the engine is cold. If the sensor is faulty, it will not allow your transmission to shift into overdrive. Also, check the thermostat, if it is stuck open, it will not allow the engine to come up to normal temperature and the transmission will not shift into overdrive.

Most common issue will be the OD switch on he shifter but, check all the above to cover all areas.

Posted on Jul 23, 2009

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Hi
Thanks for using FixYa. It could be the gear is weak or bearing is out, spacer not working right well check your clutch might not be working right either. It could also be due to a couple things--
1) Low oil level in the overdrive-  low oil means that the pump sucks air, looses pressure, and od jumps out. 2) Another thing is the solonoid. Bad o-rings that seal the solonoid can allow oil to bypass the pressure side of the system where it is really needed. The solonoid could be week, and that leads to obvious problems. 
Please do accept the solution if the issue is resolved or else revert for further assistance.

Thanks Rylee

Posted on Jul 23, 2009

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