PT Cruiser (auto) stuck in first gear with a bunch of weird codes

[Farrar]

2006 PT Cruiser Turbo, 4-speed automatic (Chrysler 41TE)

Transmission was replaced in December 2017 with remanufactured unit including new Transmission Control Module and input/output sensors.
TIPM (Totally Integrated Power Module) was replaced one month ago with a new unit.
Powertrain Control Module was replaced at a Chrysler dealership three years ago with a new unit.

Symptoms:
– When in Drive, will not shift from first gear. All other driving modes normal.

The following codes were pulled:
– P0700: Transmission Control System (MIL Request)
– P0218: Transmission Fluid Over Temperature Condition
– P0714: Transmission Fluid Temperature Sensor Circuit Intermittent
– P0882: Transmission Control Module Power Input Signal Low

I can clear the codes and get one perfectly normal drive cycle out of the vehicle, but the next time I start it, the exact same thing happens. This has happened four or five times since the whole mess started over a month ago. (Yes, I paid for a brand new TIPM which didn’t solve the problem.)

The only thing any of the shops around here want to do is start replacing computer modules for $900-$1,500 a pop. Given the age of the currently installed modules, I think that’s a red herring.

Is there a sensor/connector which could be the problem? It sure looks to me like an electrical problem, not a computer problem, but I am no expert.

Suggestions, please. I am stuck with this car until I get a new job. And that will be a while.

Thanks in advance.

Topic

[zero]

Well, one code is generic, P0700, so ignore that one. Then you have 2 codes that reference the temperature sensor and a fourth code that is either referencing voltage supply to the control unit or a sensor that isn’t reading within parameters.

Easiest thing to do would be to check and make sure you have more than 9 volts to the control module at all times. If you have a suspect battery, it could be dropping during cranking and throwing the whole system off.

Next I would look at the temperature sensor and it’s operation. It is perfectly reasonable to believe that a failed (as far as codes outputted) temperature sensor would result in the control module putting the transmission into a limp mode.

Don’t forget basics like checking the fluid level and condition before you fire the parts cannon at it.

[Billy]

Clearly the TCM wants you to check out the temperature sensor. Test the sensor, test the wiring. The FSM should have a procedure for that.

[Farrar]

Thanks.

Battery shows 12.6 Volts at rest. While running, system voltage is 13.8 Volts. I think that both of those numbers are within spec, but I can clear the codes and start the engine with a booster battery connected to see if the codes show up again.

According to the service manual, the Transmission Fluid Temperature Sensor is part of the Transmission Range Sensor. I’m not sure how to test that for voltage, since accessing it involves removing the battery and battery tray. The transmission allegedly came with all new sensors. I wouldn’t expect one to fail so soon, but I suppose anything’s possible. I can at least inspect the connector for corrosion or damage.

I appreciate your suggestions! You’ve given me something else to look for.

[Author]

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