OBD Guide
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U1502

Implausible Message Data Length Received From TCM

U1502 is an OBD-II diagnostic trouble code meaning: Implausible Message Data Length Received From TCM. Common causes: tcm software problems, transmission control module (tcm) malfunction. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Incorrect operation of the automatic transmission
  • Delays when shifting gears
  • Transmission transition to emergency mode
  • Check Engine Light Is On
  • Transmission fault message appears

Causes

  • TCM software problems
  • Transmission control module (TCM) malfunction
  • Damage to CAN bus wiring
  • Poor contact in TCM connectors
  • Corroded or damaged contacts

How to Fix

  1. Check for TCM software updates
  2. Diagnose the state of the CAN bus
  3. Check TCM connections and connectors
  4. Test the transmission control unit
  5. Replace TCM if necessary

Related codes

U1500U1501U1503

FAQ

What does the U1502 code mean?

U1502 is an OBD-II diagnostic trouble code that indicates: Implausible Message Data Length Received From TCM

What causes a U1502 error code?

The most common causes of U1502 include: TCM software problems; Transmission control module (TCM) malfunction; Damage to CAN bus wiring; Poor contact in TCM connectors.

How do I fix a U1502 diagnostic trouble code?

To fix U1502: Check for TCM software updates. Diagnose the state of the CAN bus. Check TCM connections and connectors. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with U1502?

Limited driving only, diagnose soon

How much does it cost to fix U1502?

The estimated repair cost for U1502 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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