P1AF0 GMC Code - Drive Motor 1 Control Module Hybrid/EV Battery Voltage System Isolation Lost
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 Faulty Drive Motor 1 Control Module Hybrid/EV Battery, Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted, Drive Motor 1 Control Module Hybrid/EV Battery circuit poor electrical connection. 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
- P1AF0 GMC indicates Drive Motor 1 Control Module Hybrid/EV Battery Voltage System Isolation Lost.
- Common causes
- Common causes include Faulty Drive Motor 1 Control Module Hybrid/EV Battery, Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted, Drive Motor 1 Control Module Hybrid/EV Battery circuit poor electrical connection.
- 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 P1AF0 GMC Description
Motor control modules' loss of isolation is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the high- voltage positive and high-voltage negative circuits. The centre connection of the two resistors is also connected to vehicle chassis. The motor control module then measures the voltage drop across one of the resistors. Without a loss of isolation, the motor control module should measure about half of the high voltage potential. This is referred to as mid-pack voltage. The Mid-pack voltage value is then doubled by the software and displayed on a scan tool as Motor 1 Isolation Voltage or Motor 2 Isolation Voltage. When a loss of isolation is present, the motor isolation voltage display will indicate voltage that is more or less than actual hybrid battery high voltage.
What are the Possible Causes of the DTC P1AF0 GMC?
- Faulty Drive Motor 1 Control Module Hybrid/EV Battery
- Drive Motor 1 Control Module Hybrid/EV Battery harness is open or shorted
- Drive Motor 1 Control Module Hybrid/EV Battery circuit poor electrical connection
How to Fix the DTC P1AF0 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 P1AF0 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 P1AF0 GMC code?
Need more information on how to fix the P1AF0 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1AF0 GMC code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1AF0 GMC Code
What does the OBDII code P1AF0 mean for GMC vehicles?
P1AF0 indicates a loss of voltage system isolation in the Drive Motor 1 Control Module, related to the hybrid or electric vehicle's battery system.
What are common symptoms associated with the P1AF0 code?
Common symptoms include warning lights on the dashboard, reduced power or performance, and potential issues with starting the vehicle.
What could cause the P1AF0 code to trigger?
Potential causes include damaged wiring, poor electrical connections, faulty battery isolation monitoring, or issues within the Drive Motor Control Module itself.
How can I diagnose the P1AF0 code?
Start by using an OBDII scanner to confirm the code, then visually inspect the battery connections, wiring, and connectors for damage or corrosion.
What are some common repairs for the P1AF0 code?
Repairs may involve replacing damaged wiring or connectors, repairing the isolation monitoring system, or replacing the Drive Motor Control Module if it's found to be faulty.
Can I continue to drive my GMC vehicle with a P1AF0 code?
It is not recommended to drive the vehicle, as it may lead to further damage or reduce vehicle performance. It's best to have it checked by a professional.
How can I prevent the P1AF0 code from reappearing?
Regular maintenance of the hybrid or EV battery system, including checking connections and monitoring the battery condition, can help prevent future issues.
Is it safe to reset the P1AF0 code without fixing the underlying issue?
Resetting the code without addressing the underlying problem is not advisable, as the issue may cause more severe damage or safety hazards.
What should I do if the P1AF0 code returns after repairs?
If the code reappears, further diagnostic testing may be needed to identify any additional underlying issues or malfunctions that weren't initially addressed.
Discuss the causes and fixes for P1AF0 GMC OBDII Code
Code P1AF0 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.
