AutoCodes – GMC – P1E21 GMC

P1E21 GMC Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage

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: P1E21 GMC indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,042

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1E21 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. Each drive motor control module monitors its internal high voltage sensor for correct operation, no external circuits are involved. The motor control modules and the hybrid powertrain control module are part of the power inverter module and are not serviced separately.

OBDII Code P1E21 GMC - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage - AutoCodes.com — P1E21 GMC Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery Voltage Sense Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1E21 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 P1E21 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 P1E21 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.

Need more information about the P1E21 GMC code?

Need more information on how to fix the P1E21 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1E21 GMC code diagnosed by a professional: Find a repair shop in your area

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 P1E21 GMC Code

1. What are the common symptoms of OBDII code P1E21 in a GMC vehicle?

- Common symptoms include the check engine light coming on, reduced hybrid system performance, and potential issues with the transmission fluid pump.

2. What can cause the OBDII code P1E21 in a GMC vehicle?

- The code P1E21 can be triggered by a malfunction in the auxiliary transmission fluid pump control module or a high voltage sense circuit issue related to the hybrid/EV battery.

3. How serious is the OBDII code P1E21 in a GMC vehicle?

- This code can affect the performance and drivability of the vehicle, so it is recommended to address it promptly to prevent further damage to the hybrid/EV system.

4. How can I diagnose the OBDII code P1E21 in my GMC vehicle?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the auxiliary transmission fluid pump control module, and inspecting the hybrid/EV battery voltage sense circuit for any issues.

5. Can I drive my GMC vehicle with the OBDII code P1E21?

- It is not recommended to drive the vehicle with this code present, as it may lead to further damage to the hybrid/EV system and affect the overall performance.

6. How can I repair the OBDII code P1E21 in my GMC vehicle?

- Repair may involve replacing the auxiliary transmission fluid pump control module, repairing any wiring or connection issues in the high voltage sense circuit, or addressing any other underlying causes of the code.

7. Will resetting the check engine light fix the OBDII code P1E21 in a GMC vehicle?

- Simply resetting the check engine light may temporarily clear the code, but it is important to diagnose and address the root cause of the issue to prevent it from recurring.

8. Can a DIYer fix the OBDII code P1E21 in a GMC vehicle?

- While some DIYers may have the skills to diagnose and repair this code, it is recommended to seek professional help, especially when dealing with high-voltage systems in hybrid vehicles.

9. How much does it typically cost to repair the OBDII code P1E21 in a GMC vehicle?

- The cost of repair can vary depending on the underlying issue, parts needed, and labor costs. It is advisable to get a professional diagnosis to determine an accurate estimate.

10. Are there any recalls or technical service bulletins related to the OBDII code P1E21 in GMC vehicles?

- It is advisable to check with a GMC dealership or visit the NHTSA website to see if there are any recalls or technical service bulletins related to this specific OBDII code in your vehicle.