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Old September 27th, 2021, 18:51
GunnyPortersxj GunnyPortersxj is offline
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Cool P1698 on my 2001 xj should I replace the TCM

Hello forum I have a code of p1698 and I checked all connections, fine and now should I replace the TCM.:
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Old September 27th, 2021, 20:30
lawsoncl lawsoncl is offline
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Re: P1698 on my 2001 xj should I replace the TCM

More than likely it's a corroded connector or damaged wire. It's pretty rare to have a bad TCM, and that usually manifests as a shifting issue that's not resolved by the usual fixes (tps, failing solenoid, etc).

Is it still shifting okay? The TCM connects to it's own sensors and really doesn't need to talk to the engine computer, aside from reporting error codes.
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Old September 28th, 2021, 04:54
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Tim_MN Tim_MN is offline
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Re: P1698 on my 2001 xj should I replace the TCM

Start with the free and easy stuff: Visual inspection for melted/chafed damaged wires, inspection for wire plug damage, corrosion, and bent or pushed back wire plug pins. Test the Throttle Position Sensor (TPS) The TCM does use data from the PCM and TPS.

P1698 JEEP PCM Fault No CCD Message From TCM

Possible causes:
  • Low battery voltage
  • Transmission Control Module harness is open circuit or short circuit
  • Transmission Control Module wire circuit poor electrical connection
  • Faulty Transmission Control Module (TCM)
  • Faulty Powertrain Control Module (PCM)

Originally Posted by bimmerjeeper

Go ahead and slam the liftgate down on a blanket, and see how long you are laughing.
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