P1A6F GMC Code - Drive Motor No Crank At Restart
Quick Answer
The Generator Control Module also called the Starter/Generator Control Module is comprised of the following three control modules: the Hybrid/EV Powertrain Control Module 1, 14 V Power Module, and the Drive Motor Control Module. Common causes include Check/Replace Drive Belt, Faulty Starter/Generator Control Module, Starter/Generator Control 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
- P1A6F GMC indicates Drive Motor No Crank At Restart.
- Common causes
- Common causes include Check/Replace Drive Belt, Faulty Starter/Generator Control Module, Starter/Generator Control 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 P1A6F GMC Description
The eAssist hybrid system has the ability to crank and start the engine using two different methods. The first method is a conventional 12-volt system. On every initial start up the conventional 12-volt starter and 12-volt battery are used to crank and start the engine.
The second starting method uses the 86-volt hybrid/EV battery pack and the starter/generator also called the drive motor. The drive motor is a 3 phase AC induction machine. This device not only serves as an 86-volt AC generator but is also used to provide engine power assist and to start the engine when in auto-stop mode. If the system is in the auto-stop mode and fails to restart with the drive motor, the 12-volt conventional starter will automatically be engaged to start the engine.
The Diagnostic Trouble Code (DTC) will be set when the Hybrid/EV Powertrain Control Module 1 detects that an autostart failed to take place successfully.
What are the Possible Causes of the DTC P1A6F GMC?
- Check/Replace Drive Belt
- Faulty Starter/Generator Control Module
- Starter/Generator Control Module harness is open or shorted
- Starter/Generator Control Module circuit poor electrical connection
How to Fix the DTC P1A6F 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 P1A6F 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 P1A6F GMC Code
1. What does the GMC OBDII code P1A6F mean?
The P1A6F code indicates "Drive Motor No Crank At Restart," meaning the hybrid or electric drive motor is not starting properly after being shut down.
2. What are the common symptoms of the P1A6F code?
Symptoms include the vehicle failing to restart, warning lights on the dashboard, and reduced or no electric drive functionality.
3. What causes the P1A6F code on a GMC vehicle?
Common causes include issues with the hybrid battery, drive motor, high-voltage wiring, or a malfunction in the hybrid control module.
4. Can a discharged hybrid battery cause the P1A6F code?
Yes, a low or discharged hybrid battery can trigger this code as it may prevent the drive motor from restarting.
5. How is the P1A6F code diagnosed?
A technician will use a scan tool to check the code, inspect the hybrid battery state of charge, and test the drive motor and related wiring for faults.
6. Can the P1A6F code be caused by a software issue?
Yes, outdated or corrupted software in the hybrid control module can potentially trigger this code and may require a reprogramming or update.
7. Is the P1A6F code specific to hybrid GMC vehicles?
Yes, this code generally applies to GMC hybrid or electric vehicles equipped with a drive motor and high-voltage systems.
8. How serious is the P1A6F code?
It is a serious issue because it can prevent the vehicle from restarting, leaving it inoperable until the problem is resolved.
9. What repairs are commonly needed for the P1A6F code?
Repairs may include recharging or replacing the hybrid battery, repairing high-voltage wiring, replacing the drive motor, or reprogramming the hybrid control module.
10. Can I drive my GMC with the P1A6F code active?
It is not recommended, as the vehicle may fail to restart or experience further damage to its hybrid system components.
Discuss the causes and fixes for P1A6F GMC OBDII Code
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