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P0929

P0929: Transmission Advanced System - Transmission Control Module (TCM) Internal Error

Fix Cost

$500 - $1500

Parts & Labor

Difficulty

4/5

Hard

1-2 hours

DIY Possible?

❌ No

Pro recommended

📖 What Does P0929 Mean?

The Transmission Control Module (TCM) has detected an internal error, which may be caused by a faulty TCM, wiring issue, or software problem.

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Symptoms

• Transmission slips
• hesitation
• or refuses to engage gears
• check engine light illuminated

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Common Causes

• Faulty TCM
• wiring issue
• software problem
• transmission solenoid malfunction
• faulty transmission sensor

Fix Guide

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Possible Solutions

1. Clear the code and monitor the vehicle to see if the code returns. If it does, replace the TCM. 2. Check and repair any wiring issues. 3. Update the transmission software if necessary. 4. Replace the transmission solenoid if faulty. 5. Replace the transmission sensor if faulty.

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❓ Common Questions About P0929

Can I drive with code P0929?

No, it is not recommended. Seeing code P0929 indicates a serious issue that could damage your engine or transmission if ignored. You should stop driving and have it inspected immediately.

How much does it cost to fix P0929?

The estimated repair cost for code P0929 is between $500 and $1500. This includes parts and labor for most makes and models.

Is this code easy to fix myself?

This repair is considered difficult. It may require specialized tools or significant disassembly. Professional help is recommended if you aren't an experienced DIYer.