P1E28 GMC Code - Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System 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
- P1E28 GMC indicates Auxiliary Transmission Fluid Pump Control Module Hybrid/EV Battery System 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.
Code P1E28 GMC Description
What are the Possible Causes of the DTC P1E28 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 P1E28 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 P1E28 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 P1E28 GMC code?
Need more information on how to fix the P1E28 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1E28 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1E28 GMC Code
1. What does the OBDII code P1E28 mean on a GMC vehicle?
P1E28 indicates an issue with the Auxiliary Transmission Fluid Pump Control Module, specifically related to Hybrid/EV battery system voltage in GMC hybrid or electric vehicles.
2. What are the common symptoms of the P1E28 code?
Symptoms may include reduced vehicle performance, transmission overheating, a check engine light, and potential drivetrain warning messages.
3. What causes the P1E28 code to appear?
The code is often caused by issues such as a faulty auxiliary transmission fluid pump, a malfunctioning control module, wiring problems, or abnormal hybrid/EV battery voltage.
4. Can driving with the P1E28 code damage my GMC vehicle?
Yes, driving with this code can lead to transmission overheating or reduced efficiency, potentially causing further damage to the transmission system.
5. How is the P1E28 code diagnosed?
A technician will use a scan tool to confirm the code, inspect the auxiliary pump and wiring, check hybrid battery voltage, and test the control module's functionality.
6. Can a weak hybrid/EV battery trigger the P1E28 code?
Yes, an abnormal hybrid/EV battery system voltage can trigger this code since the auxiliary transmission fluid pump relies on a stable voltage supply.
7. What repairs are commonly needed to fix the P1E28 code?
Repairs may include replacing the auxiliary transmission fluid pump, repairing or replacing damaged wiring, reprogramming the control module, or addressing hybrid battery issues.
8. Is the P1E28 code unique to GMC hybrid and electric vehicles?
Yes, this code is specific to GMC hybrid and electric vehicles equipped with an auxiliary transmission fluid pump and a hybrid/EV battery system.
9. How much does it typically cost to fix the P1E28 GMC code?
Repair costs vary but may range from $300 to $1,500 depending on whether the issue is with the pump, wiring, or control module.
10. Can disconnecting the battery clear the P1E28 code temporarily?
Disconnecting the battery may clear the code temporarily, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P1E28 GMC OBDII Code
Code P1E28 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
