AutoCodes – GMC – P1E29 GMC

P1E29 GMC Code - Auxiliary Transmission Fluid Pump Control Module Calculated Motor Position Performance

Quick Answer

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Common causes include Program Power Inverter Module, Faulty Power Inverter Module, Power Inverter Module harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1E29 GMC indicates Auxiliary Transmission Fluid Pump Control Module Calculated Motor Position Performance.
Common causes: Common causes include Program Power Inverter Module, Faulty Power Inverter Module, Power Inverter Module harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 793

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E29 GMC Description

The power inverter module, often referred to as the drive motor generator power inverter module, contains three motor control modules and the hybrid powertrain control module. Two of the motor control modules operate their respective drive motor generator based upon power inverter module commands. The third motor control module controls the auxiliary transmission fluid pump motor. The hybrid powertrain control module and the motor control modules share the power inverter module ignition voltage circuit, battery voltage circuits and chassis earth. The motor control modules and the hybrid powertrain control module are part of the power inverter module and are not serviced separately.
The auxiliary transmission fluid pump motor control module uses sensorless control to estimate motor speed and position from the phase current sensors.

OBDII Code P1E29 GMC - Auxiliary Transmission Fluid Pump Control Module Calculated Motor Position Performance - AutoCodes.com — P1E29 GMC Code - Auxiliary Transmission Fluid Pump Control Module Calculated Motor Position Performance

What does this mean?

What are the Possible Causes of the DTC P1E29 GMC?

Program Power Inverter Module
Faulty Power Inverter Module
Power Inverter Module harness is open or shorted
Power Inverter Module circuit poor electrical connection

How to Fix the DTC P1E29 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1E29 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1E29 GMC Code

1. What does the OBDII code P1E29 mean on a GMC vehicle?

P1E29 indicates an issue with the Auxiliary Transmission Fluid Pump Control Module, specifically related to the calculated motor position performance.

2. What are common symptoms of code P1E29 in a GMC vehicle?

Symptoms may include illuminated warning lights like the Check Engine Light, erratic shifting, reduced transmission performance, or the vehicle entering limp mode.

3. What causes the P1E29 code in GMC vehicles?

Causes can include a malfunctioning auxiliary transmission fluid pump, faulty control module, wiring or connector issues, or a software problem in the transmission control system.

4. How serious is the P1E29 code on a GMC vehicle?

This code can be serious as it may affect transmission performance, leading to potential drivability issues or further damage if not addressed.

5. Can I drive my GMC with the P1E29 code active?

While the vehicle may still be drivable, itâ€™s not recommended as ignoring the issue could lead to further transmission damage or unsafe driving conditions.

6. What are the first steps to diagnose the P1E29 code in a GMC?

Start by using a scan tool to verify the code, then inspect the auxiliary transmission fluid pump, wiring, and connectors for damage or loose connections.

7. How do you fix the P1E29 code on a GMC vehicle?

Repairs may involve replacing the auxiliary transmission fluid pump, repairing or replacing damaged wiring or connectors, or reprogramming the control module.

8. Do I need to reprogram the control module to fix the P1E29 code?

In some cases, yes. A software update or reprogramming may be required if the issue stems from a control module malfunction.

9. How much does it cost to repair the P1E29 code on a GMC?

Repair costs can vary widely, averaging between $150 to $900 depending on whether the issue involves replacing the pump, fixing wiring, or reprogramming the module.

10. Can low transmission fluid cause the P1E29 code in a GMC?

Low transmission fluid is not a direct cause, but it can lead to pump issues or transmission damage, which may trigger related codes. Always ensure fluid levels are correct.