OBD Guide
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P1529

TCM Mil On Request Signal

P1529 is an OBD-II diagnostic trouble code meaning: TCM Mil On Request Signal. Common causes: transmission control module (tcm) malfunction, tcm circuit problems. Estimated repair cost: $56–278.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–278 (est.)

Symptoms

  • Malfunction indicator lamp (MIL) is on
  • Possible problems with gear shifting
  • The car may go into emergency mode
  • Reduced transmission efficiency
  • Possible jerking when changing gears

Causes

  • Transmission control module (TCM) malfunction
  • TCM circuit problems
  • Software glitch in TCM
  • Mechanical problems in the transmission
  • Damage to the wiring harness to the TCM

How to Fix

  1. Perform TCM diagnostics using an OBD-II scanner
  2. Check TCM electrical continuity
  3. Update or reflash TCM software
  4. Check the mechanical condition of the transmission
  5. Replace TCM if necessary

Related codes

P0700P1700P1701

Error P1529 by Vehicle Brand

BMWBuickCadillacChevroletChryslerGMGMCOldsmobileSaturnVolkswagen

FAQ

What does the P1529 code mean?

P1529 is an OBD-II diagnostic trouble code that indicates: TCM Mil On Request Signal

What causes a P1529 error code?

The most common causes of P1529 include: Transmission control module (TCM) malfunction; TCM circuit problems; Software glitch in TCM; Mechanical problems in the transmission.

How do I fix a P1529 diagnostic trouble code?

To fix P1529: Perform TCM diagnostics using an OBD-II scanner. Check TCM electrical continuity. Update or reflash TCM software. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1529?

Yes, but get it checked soon

How much does it cost to fix P1529?

The estimated repair cost for P1529 is $56–278. Actual cost depends on your vehicle, location, and labor rates.

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