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P0C29 OBD2: AUXILIARY Transmission Fluid Pump Driver Circuit Performance

P0C29 OBD2: AUXILIARY Transmission Fluid Pump Driver Circuit Performance

What Does the P0C29 Code Mean?

The P0C29 OBD-II code signifies an issue with the auxiliary transmission fluid pump driver circuit performance. It indicates that the electric motor, controlled by the Motor Control Module (MCM), is not functioning correctly, potentially affecting the vehicle’s transmission performance.

What Causes the P0C29 Code?

This code is often triggered by a failure in the auxiliary transmission pump or a malfunction in the Drive Motor Generator Power Inverter Control Module. The MCM monitors high voltage current driving the transmission; if this current exceeds acceptable levels, the P0C29 code will be set.

What Are the Symptoms of the P0C29 Code?

  • Vehicle may be immovable

How Serious Is the P0C29 Code?

The P0C29 code is classified as urgent. It indicates a significant malfunction that could lead to severe damage to the vehicle’s transmission or pose a safety risk to the driver and passengers. Immediate attention is necessary.

How to Diagnose the P0C29 Code

Diagnosing the P0C29 code involves using an OBD-II scanner to confirm the fault code. A thorough inspection of the auxiliary transmission pump, electrical connections, and the Drive Motor Generator Power Inverter Control Module is also necessary. Checking for any additional trouble codes may help identify related issues.

Common Repairs for the P0C29 Code

  • Replacing the auxiliary transmission pump
  • Repairing or replacing the Drive Motor Generator Power Inverter Control Module

How Much Does It Cost to Fix the P0C29 Code?

The cost to repair the P0C29 code can vary significantly based on the specific issue. Replacing an auxiliary transmission pump may range from $300 to $800, while repairs or replacements of the control module can exceed $1,000, depending on labor rates and parts availability.

Can I Fix the P0C29 Code Myself?

While some DIY enthusiasts may tackle this issue, it is crucial to have a proper understanding of automotive electrical systems and transmission components. Due to the complexity of the repairs and the potential risks involved, seeking professional assistance is highly recommended.

About JC Landry

JC spent 15+ years as a certified Master Mechanic before trading the shop for the keyboard. He's worked across dealerships, owned and operated his own independent garage, and consulted on automotive trade school curricula, reviewing technical textbooks used in vocational programs. He now serves as Editor-in-Chief at eManualOnline.com, where he oversees the platform's technical content. He's one of the few voices in automotive publishing who has actually turned wrenches professionally on the vehicles he covers. He didn't learn automotive repair to write about it. He learned to write after spending over a decade doing it.

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