P1AC1 GMC Code - Starter/Generator Control Module Cooling Fan Relay Control Circuit Low 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
- P1AC1 GMC indicates Starter/Generator Control Module Cooling Fan Relay Control Circuit Low 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 P1AC1 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 P1AC1 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 P1AC1 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 P1AC1 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 P1AC1 GMC Code
1. What are the common symptoms of OBDII code P1AC1 in a GMC vehicle?
The common symptoms of OBDII code P1AC1 include a malfunctioning starter/generator control module cooling fan, poor performance of the starter/generator system, and potential illumination of the Check Engine Light.
2. What can cause the OBDII code P1AC1 in a GMC vehicle?
The OBDII code P1AC1 in a GMC vehicle is typically caused by a low voltage condition in the starter/generator control module cooling fan relay control circuit.
3. How can I diagnose the OBDII code P1AC1 in my GMC vehicle?
Diagnosing the OBDII code P1AC1 involves checking the cooling fan relay control circuit for low voltage, inspecting the wiring and connectors for damage or loose connections, and testing the starter/generator control module for proper functionality.
4. What are some repair tips for fixing OBDII code P1AC1 in a GMC vehicle?
Repair tips for addressing OBDII code P1AC1 include repairing or replacing damaged wiring and connectors, testing and replacing the starter/generator control module if necessary, and ensuring proper voltage supply to the cooling fan relay control circuit.
5. Can I continue driving my GMC vehicle with OBDII code P1AC1?
It is not recommended to continue driving your GMC vehicle with OBDII code P1AC1, as it can lead to potential issues with the starter/generator system and affect overall vehicle performance. It is advisable to address the code promptly.
6. How serious is OBDII code P1AC1 in a GMC vehicle?
OBDII code P1AC1 should be taken seriously as it indicates a low voltage condition in the starter/generator control module cooling fan relay control circuit, which can impact the proper functioning of the system. Ignoring the code can lead to further damage and costly repairs.
7. Can a DIY enthusiast fix OBDII code P1AC1 in a GMC vehicle?
Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to address OBDII code P1AC1 by following diagnostic procedures, checking wiring connections, and potentially replacing the starter/generator control module or cooling fan relay.
8. How much does it typically cost to repair OBDII code P1AC1 in a GMC vehicle?
The cost of repairing OBDII code P1AC1 in a GMC vehicle can vary depending on the extent of the issue, parts needed for replacement, and labor costs. It is advisable to consult a mechanic or dealership for an accurate estimate.
9. Is there a way to prevent OBDII code P1AC1 from occurring in the future?
Regular maintenance of the starter/generator system, including checking wiring connections, monitoring voltage levels, and addressing any issues promptly, can help prevent OBDII code P1AC1 from occurring in the future.
10. How long does it typically take to repair OBDII code P1AC1 in a GMC vehicle?
The repair time for OBDII code P1AC1 in a GMC vehicle can vary depending on the specific issue and the availability of parts. It is best to consult with a qualified mechanic for an accurate estimate of the repair duration.
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