P1A6A Buick 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 Buick 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 Buick 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 Buick?
- 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 Buick?
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 Buick 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 Buick Code
1. What does the OBDII code P1A6A mean on a Buick?
The P1A6A code indicates an issue with the Starter/Generator Control Module's Read Only Memory (ROM), which may affect the hybrid or electrical system functionality.
2. What are the common symptoms of the P1A6A code?
Symptoms may include a check engine light, reduced fuel efficiency, limited hybrid or electric system performance, or the vehicle entering a limp mode.
3. What can cause the P1A6A code to appear?
The code can be triggered by corrupted ROM data, software glitches in the Starter/Generator Control Module, or a failed module.
4. Can a weak battery cause the P1A6A code?
Yes, a weak or failing 12V auxiliary battery or high-voltage hybrid battery can cause communication or memory issues in the control module, triggering the code.
5. How is the P1A6A code diagnosed?
A technician will use a diagnostic scanner to confirm the code, check for related codes, inspect wiring and connectors, and may perform a software reflash or test the module itself.
6. Can I drive with the P1A6A code active?
Driving with this code is not recommended, as it may lead to reduced vehicle performance or damage to hybrid or electrical components.
7. How is the P1A6A code fixed?
Repairs may include reprogramming or updating the Starter/Generator Control Module software, replacing the module, or repairing damaged wiring.
8. Will clearing the P1A6A code solve the issue?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be fixed to prevent the code from returning.
9. Is the P1A6A code covered under warranty for a Buick?
This depends on the vehicle’s warranty terms, but hybrid or electrical component issues may be covered under extended manufacturer warranties.
10. Can a DIY mechanic fix the P1A6A code?
Fixing this code often requires specialized diagnostic tools and software, so it is recommended to seek professional assistance.
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