P1A6A GMC Code - Starter/Generator Control Module Read Only Memory
Quick Answer
The purpose of the Accessory Power Module (APM), integral to the Starter/Generator Control Module (SGCM), is to control the amount and direction of energy flowing between the 42 V DC and 14 V DC buses via the APM, bi-directional 42 V DC to 14 V DC converter. Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module harness is open or shorted, Starter/Generator Control Module 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
- P1A6A GMC indicates Starter/Generator Control Module Read Only Memory.
- Common causes
- Common causes include Faulty Starter/Generator Control Module (SGCM), Starter/Generator Control Module harness is open or shorted, Starter/Generator Control Module 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 P1A6A GMC Description
When the APM Power Conversion direction is set to a value of 42 V to 14 V, the energy will flow from the 42 V DC Bus to the 14 V DC Bus via the APM. When the Service Charge or jump starting is requested, the energy will flow from the 14 V DC Bus to the 42 V DC Bus via the APM. When the APM Power Conversion direction is set to a value of Off, the APM will be turned off, and not consume or transfer any power. When the APM Power Conversion direction is set to a value of Invalid, the energy will flow from the 42 V DC Bus to the 14 V DC Bus via the APM.
What are the Possible Causes of the DTC P1A6A GMC?
- Faulty Starter/Generator Control Module (SGCM)
- Starter/Generator Control Module harness is open or shorted
- Starter/Generator Control Module circuit poor electrical connection
How to Fix the DTC P1A6A 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 P1A6A 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 P1A6A GMC Code
1. What does the OBDII code P1A6A mean on a GMC vehicle?
The P1A6A code indicates an issue with the Starter/Generator Control Module's Read Only Memory (ROM), which stores critical programming data for hybrid or electrical systems.
2. What are the common symptoms of the P1A6A code?
Symptoms may include a check engine light, reduced power mode, problems with hybrid system performance, or failure of the vehicle to start.
3. What causes the P1A6A code on a GMC vehicle?
The most common causes are corrupted ROM data, software issues in the Starter/Generator Control Module, or internal module failure.
4. Can the P1A6A code cause drivability issues?
Yes, the code can lead to reduced power mode, poor fuel efficiency, or the inability to use hybrid features, depending on the severity of the fault.
5. How is the P1A6A code diagnosed?
A technician will use a scan tool to verify the code, check for related codes, and may perform module tests or inspect wiring and connections to the Starter/Generator Control Module.
6. Can the P1A6A code be fixed with a software update?
In some cases, a software update or reprogramming of the Starter/Generator Control Module may resolve the issue if the ROM data is simply corrupted.
7. Does the Starter/Generator Control Module need to be replaced for the P1A6A code?
If reprogramming or software updates fail, the module may need replacement, especially if there's internal hardware damage.
8. Can a weak battery cause the P1A6A code to appear?
While unlikely, a weak or failing 12V or hybrid battery can sometimes lead to electrical issues that might trigger this code.
9. Is it safe to drive with the P1A6A code active?
Driving with this code is not recommended as it may cause reduced performance, hybrid system failure, or further damage to the Starter/Generator Control Module.
10. How much does it cost to repair the P1A6A code on a GMC vehicle?
Repair costs can vary widely, from $100-$200 for reprogramming to $1,000 or more if the Starter/Generator Control Module needs replacement.
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