P1A64 GMC Code - Starter/Generator Control Module Reset
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, harness is open or shorted, 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
- P1A64 GMC indicates Starter/Generator Control Module Reset.
- Common causes
- Common causes include Faulty, harness is open or shorted, 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 P1A64 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 P1A64 GMC?
- Faulty
- harness is open or shorted
- circuit poor electrical connection
How to Fix the DTC P1A64 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 P1A64 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 P1A64 GMC Code
1. What does the OBDII code P1A64 mean on a GMC vehicle?
P1A64 indicates an issue with the Starter/Generator Control Module Reset, which is typically related to hybrid or electric vehicle systems.
2. What are the common symptoms of a P1A64 code in a GMC?
You may experience warning lights on the dashboard, such as the check engine light or hybrid system warning, and possible reduced engine or hybrid system performance.
3. What causes the P1A64 code to appear?
Common causes include faulty Starter/Generator Control Module, wiring or connection issues in the control circuit, or software glitches in the module.
4. Can a bad battery trigger a P1A64 code?
Yes, a weak or failing hybrid battery or 12V auxiliary battery can contribute to this code by affecting the Starter/Generator Control Module’s operation.
5. How is the P1A64 code diagnosed?
A mechanic will use a scan tool to retrieve the code and inspect the Starter/Generator Control Module, wiring harness, and battery systems for faults.
6. Can I drive my GMC with a P1A64 code?
Driving with this code is not recommended, as it may lead to reduced performance or further damage to the hybrid or electrical system.
7. How do I fix the P1A64 code on my GMC?
Repairs may involve resetting the module, repairing or replacing damaged wiring, updating module software, or replacing the Starter/Generator Control Module if necessary.
8. Is the P1A64 code specific to GMC hybrid or electric vehicles?
Yes, this code is primarily associated with GMC vehicles equipped with hybrid or electric powertrains, as it pertains to the Starter/Generator Control Module.
9. Can clearing the code with a scan tool solve the issue?
Clearing the code may temporarily reset the system, but if the underlying issue isn’t fixed, the code will likely return.
10. What is the cost of repairing a P1A64 code in a GMC?
The cost can vary widely depending on the root cause, ranging from $100 for minor wiring fixes to over $1,000 for module replacement.
Discuss the causes and fixes for P1A64 GMC OBDII Code
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