No CCD/J1850 Message From TCM (Chrysler)
What does P1698 mean?
The P1698 code means the vehicle's onboard diagnostic system has detected: No CCD/J1850 Message From TCM (Chrysler). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Transmission stuck in limp mode (2nd gear)
- No automatic shifting
- Transmission warning light on
- Harsh or delayed shifts
Probable Causes (Ranked by Likelihood)
- Failed transmission control module (TCM) Very High
- Broken bus wiring between PCM and TCM High
- Corroded TCM connector Moderate
- TCM power or ground supply failure Low
Step-by-Step Diagnostic Procedure
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Attempt to communicate with the TCM using a scan tool. No response confirms communication failure.
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Check the TCM connector for corrosion, water damage, or loose pins.
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Verify power and ground supply to the TCM (located on or near the transmission on most Chrysler vehicles).
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Check the bus wiring between the PCM and TCM for continuity.
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If the TCM has failed, it must be replaced and may require programming and adaptation.
Frequently Asked Questions
Why is my transmission stuck in 2nd gear?
When the PCM loses communication with the TCM, the transmission enters limp mode, which locks it in 2nd gear for safe driving at reduced speed.
Where is the TCM located?
On most Chrysler vehicles with a separate TCM, it is mounted on the transmission or in the engine compartment near the transmission. Some newer models integrate the TCM into the PCM.
Can I drive in limp mode?
Short distances only. Limp mode limits you to 2nd gear, which means slow speeds and high RPMs. Extended driving in limp mode can overheat the transmission.