P1AC2 GMC Code - Starter/Generator Control Module Cooling Fan Relay Control Circuit High Voltage
Quick Answer
The Starter/Generator Control Module (SGCM) controls the coolant fan operation by applying voltage to the coolant fan relay control circuit with an internal solid state device called a driver. Common causes include Faulty Starter/Generator Control Module Cooling Fan Relay, Starter/Generator Control Module Cooling Fan Relay harness is open or shorted, Starter/Generator Control Module Cooling Fan Relay 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
- P1AC2 GMC indicates Starter/Generator Control Module Cooling Fan Relay Control Circuit High Voltage.
- Common causes
- Common causes include Faulty Starter/Generator Control Module Cooling Fan Relay, Starter/Generator Control Module Cooling Fan Relay harness is open or shorted, Starter/Generator Control Module Cooling Fan Relay 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 P1AC2 GMC Description
The SGCM monitors the relay control circuits for the following conditions:
- Short to ground
- Short to voltage
An open circuit
If the SGCM detects an improper voltage level on the coolant fan relay control circuit, then DTC P1AC1 or P1AC2 will set and the driver will be disabled.
What are the Possible Causes of the DTC P1AC2 GMC?
- Faulty Starter/Generator Control Module Cooling Fan Relay
- Starter/Generator Control Module Cooling Fan Relay harness is open or shorted
- Starter/Generator Control Module Cooling Fan Relay circuit poor electrical connection
How to Fix the DTC P1AC2 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 P1AC2 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.
Need more information about the P1AC2 GMC code?
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Frequently Asked Questions about P1AC2 GMC Code
1. What are common symptoms of OBDII code P1AC2 in a GMC vehicle?
- Common symptoms include the cooling fan running at high speed constantly, the vehicle's starter/generator not functioning properly, and potential illumination of the check engine light.
2. What could cause the Starter/Generator Control Module Cooling Fan Relay Control Circuit High Voltage error code in a GMC?
- Possible causes include a faulty cooling fan relay, issues with the starter/generator control module, damaged wiring or connectors, or a malfunctioning cooling fan.
3. How can I diagnose the OBDII code P1AC2 in my GMC?
- To diagnose this code, you may need to perform a thorough inspection of the cooling fan relay, starter/generator control module, and associated wiring. Using a diagnostic scanner to read live data can also help pinpoint the issue.
4. Can I still drive my GMC with the P1AC2 code present?
- It is not recommended to drive your GMC with this code present, as it can lead to issues with the starter/generator and cooling system. It's best to address the problem promptly to avoid further damage.
5. What are some repair tips for fixing the Starter/Generator Control Module Cooling Fan Relay Control Circuit High Voltage issue?
- Repair tips may include checking and replacing the cooling fan relay, inspecting and repairing any damaged wiring or connectors, testing the starter/generator control module, and ensuring proper cooling fan operation.
6. Is it possible to reset the OBDII code P1AC2 in a GMC without fixing the underlying issue?
- While you can clear the code with a diagnostic scanner, it is essential to address the root cause of the problem to prevent the code from reoccurring.
7. Will replacing the cooling fan fix the P1AC2 code in a GMC?
- Replacing the cooling fan may resolve the issue if the fan itself is faulty. However, it's crucial to diagnose the problem accurately to avoid unnecessary part replacements.
8. How much does it typically cost to repair the Starter/Generator Control Module Cooling Fan Relay Control Circuit High Voltage problem in a GMC?
- The cost of repair can vary depending on the exact cause of the issue and the labor rates in your area. It's advisable to consult a mechanic for an accurate estimate.
9. Can a DIY enthusiast fix the P1AC2 code in a GMC, or is it best left to professionals?
- While some experienced DIY enthusiasts may be able to diagnose and repair this issue, it's recommended to seek professional help, especially when dealing with complex electrical systems like the starter/generator control module.
10. How urgent is it to address the OBDII code P1AC2 in a GMC?
- It is advisable to address this code promptly to prevent potential damage to the starter/generator system and ensure the proper functioning of the cooling fan relay.
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