OBD Guide
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C2502

DTCM Signal Plausibility Failure

C2502 is an OBD-II diagnostic trouble code meaning: DTCM Signal Plausibility Failure. Common causes: damage to dtcm wiring harness, dtcm module malfunction. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$56–167 (est.)

Symptoms

  • Check Engine light comes on
  • Disabling the stabilization system
  • Unstable operation of the traction control system
  • Loss of power or jerking when driving

Causes

  • Damage to DTCM wiring harness
  • DTCM module malfunction
  • Poor contact in connectors
  • DTCM module software error
  • Problems with module power or grounding

How to Fix

  1. Check the DTCM wiring harness and connectors for damage.
  2. Scan all modules for additional errors
  3. Check power supply and grounding of DTCM module
  4. Update DTCM software (if available)
  5. Replace DTCM if necessary

Related codes

C2500C2501U0121

FAQ

What does the C2502 code mean?

C2502 is an OBD-II diagnostic trouble code that indicates: DTCM Signal Plausibility Failure

What causes a C2502 error code?

The most common causes of C2502 include: Damage to DTCM wiring harness; DTCM module malfunction; Poor contact in connectors; DTCM module software error.

How do I fix a C2502 diagnostic trouble code?

To fix C2502: Check the DTCM wiring harness and connectors for damage.. Scan all modules for additional errors. Check power supply and grounding of DTCM module. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C2502?

Do not drive — repair immediately

How much does it cost to fix C2502?

The estimated repair cost for C2502 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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