P1AF7 GMC Code - Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage
Quick Answer
The drive motor generator Power Inverter Control Module (PIM) contains two Motor Control Modules (MCMs). Common causes include Reprogram Power Inverter Control Module (PIM), Faulty Power Inverter Control Module (PIM), Power Inverter Control Module (PIM) 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
- P1AF7 GMC indicates Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage.
- Common causes
- Common causes include Reprogram Power Inverter Control Module (PIM), Faulty Power Inverter Control Module (PIM), Power Inverter Control Module (PIM) 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 P1AF7 GMC Description
MCM LOI is detected through the use of two high-impedance resistors and voltage measuring circuitry. The two resistors are connected in series between the HV positive and HV negative circuits. The center connection of the two resistors is also connected to vehicle chassis. The MCM then measures the voltage drop across one of the resistors. Without a loss of isolation, the MCM 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. The MCM monitors the LOI voltage measuring circuitry for correct operation.
What are the Possible Causes of the DTC P1AF7 GMC?
- Reprogram Power Inverter Control Module (PIM)
- Faulty Power Inverter Control Module (PIM)
- Power Inverter Control Module (PIM) harness is open or shorted
- Power Inverter Control Module (PIM) circuit poor electrical connection
How to Fix the DTC P1AF7 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 P1AF7 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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Frequently Asked Questions about P1AF7 GMC Code
1. What are the common symptoms of OBDII code P1AF7 in a GMC vehicle?
- Common symptoms include the check engine light illuminating, reduced hybrid system performance, and potential issues with the hybrid battery.
2. What could cause the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage code to trigger?
- The code may be triggered by a faulty hybrid battery voltage isolation sensor, damaged wiring or connectors, or issues with the drive motor 2 control module.
3. How can I diagnose the cause of OBDII code P1AF7 in my GMC vehicle?
- A thorough inspection of the hybrid battery isolation sensor, wiring, and connectors, as well as testing the drive motor 2 control module, can help pinpoint the issue.
4. Is it safe to continue driving with the P1AF7 code present in a GMC hybrid vehicle?
- It is not recommended to drive the vehicle with this code present, as it can affect the performance and safety of the hybrid system.
5. Can I reset the OBDII code P1AF7 in my GMC vehicle, and will it solve the issue?
- While resetting the code may temporarily turn off the check engine light, it will not fix the underlying problem causing the high voltage isolation sensor circuit issue.
6. Are there any repair tips for fixing the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage code?
- Repair tips may include checking and replacing the isolation sensor, repairing damaged wiring or connectors, and ensuring proper functionality of the drive motor 2 control module.
7. How much does it typically cost to repair OBDII code P1AF7 in a GMC hybrid vehicle?
- The cost of repairs can vary depending on the exact cause of the issue, but it may involve sensor replacement, wiring repairs, or module diagnostics, which could range from a few hundred to over a thousand dollars.
8. Will the P1AF7 code affect the fuel efficiency of my GMC hybrid vehicle?
- Yes, the code can impact the fuel efficiency of the vehicle due to potential performance issues with the hybrid system.
9. Can a DIY enthusiast troubleshoot and repair the Drive Motor 2 Control Module Hybrid Battery Voltage Isolation Sensor Circuit High Voltage code?
- While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing complex hybrid system issues like this code may require specialized knowledge and tools best left to professionals.
10. How often does the OBDII code P1AF7 occur in GMC hybrid vehicles?
- The occurrence of this code can vary, but it is not uncommon in GMC hybrid vehicles experiencing issues with the drive motor control module or hybrid battery voltage isolation sensor circuit.
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