P0691 2016 GMC Sierra Code - Cooling Fan Speed Output Circuit Low Voltage
Quick Answer
The P0691 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the cooling fan speed output circuit registering low voltage. Common causes include Faulty cooling fan relay: A malfunctioning cooling fan relay can prevent the fan from receiving the necessary voltage to operate at the correct speed, Wiring issues: Damaged or corroded wiring in the cooling fan speed output circuit can disrupt the flow of voltage and trigger the P0691 code, Faulty cooling fan motor: A defective cooling fan motor may not receive the required voltage to operate efficiently, leading to low voltage in the circuit. 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
- P0691 2016 GMC Sierra indicates Cooling Fan Speed Output Circuit Low Voltage.
- Common causes
- Common causes include Faulty cooling fan relay: A malfunctioning cooling fan relay can prevent the fan from receiving the necessary voltage to operate at the correct speed, Wiring issues: Damaged or corroded wiring in the cooling fan speed output circuit can disrupt the flow of voltage and trigger the P0691 code, Faulty cooling fan motor: A defective cooling fan motor may not receive the required voltage to operate efficiently, leading to low voltage in the circuit.
- 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.
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Code P0691 2016 GMC Sierra Description
The P0691 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the cooling fan speed output circuit registering low voltage. In modern vehicles, the cooling fan plays a crucial role in maintaining the optimal operating temperature of the engine. When the engine reaches a certain temperature, the cooling fan is activated to help dissipate heat and prevent overheating.
Common Causes of P0691 2016 GMC Sierra
- Faulty cooling fan relay: A malfunctioning cooling fan relay can prevent the fan from receiving the necessary voltage to operate at the correct speed.
- Wiring issues: Damaged or corroded wiring in the cooling fan speed output circuit can disrupt the flow of voltage and trigger the P0691 code.
- Faulty cooling fan motor: A defective cooling fan motor may not receive the required voltage to operate efficiently, leading to low voltage in the circuit.
- PCM failure: A malfunctioning PCM can incorrectly interpret the voltage in the cooling fan speed output circuit, triggering the P0691 code.
Symptoms of P0691 2016 GMC Sierra
- Engine overheating: One of the most common symptoms associated with the P0691 code is engine overheating due to inadequate cooling from the malfunctioning cooling fan.
- High engine temperature gauge: The temperature gauge on the dashboard may show higher than normal temperatures, indicating a problem with the cooling system.
- Reduced air conditioning performance: The air conditioning system may not cool the interior of the vehicle effectively if the cooling fan is not operating at the correct speed.
- Check Engine Light: The Check Engine Light may illuminate on the dashboard to alert the driver of a potential issue with the cooling fan speed output circuit.
How to Fix P0691 2016 GMC Sierra
- Diagnose the issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the cooling fan speed output circuit, including the relay, wiring, and fan motor.
- Test the cooling fan relay: Check the functionality of the cooling fan relay and replace it if necessary.
- Inspect wiring: Inspect the wiring in the cooling fan speed output circuit for any damage or corrosion, and repair or replace as needed.
- Test cooling fan motor: Test the cooling fan motor to ensure it is receiving the correct voltage and replace if it is faulty.
- Clear the DTC: After completing the repairs, clear the DTC using a scan tool and test the vehicle to ensure the issue has been resolved.
Cost to Fix P0691 2016 GMC Sierra
The cost of repairing a P0691 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. On average, the cost of parts such as a cooling fan relay or motor can range from $50 to $200. Labor costs at auto repair shops typically range from $80 to $150 per hour. Therefore, the total repair cost for addressing a P0691 code could range from $150 to $500 or more, depending on the extent of the repairs needed. It's recommended to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your vehicle.
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Frequently Asked Questions about P0691 2016 GMC Sierra Code
1. What does the OBDII code P0691 mean on a 2016 GMC Sierra?
P0691 indicates a low voltage issue in the cooling fan speed output circuit, which can affect the cooling fan's operation.
2. What are the symptoms of a P0691 code on a 2016 GMC Sierra?
Symptoms may include an illuminated check engine light, engine overheating, an inoperative cooling fan, or unusual fan operation.
3. What causes the P0691 code on a 2016 GMC Sierra?
Common causes include a faulty cooling fan relay, damaged wiring or connectors in the fan circuit, a malfunctioning cooling fan motor, or a failing powertrain control module (PCM).
4. Can I drive my 2016 GMC Sierra with a P0691 code?
Driving with this code is not recommended as it may lead to engine overheating, which can cause severe engine damage.
5. How do I diagnose the P0691 code on my 2016 GMC Sierra?
Start by inspecting the cooling fan relay, wiring, and connectors for damage or corrosion. Test the cooling fan motor and verify the circuit voltage with a multimeter.
6. How can I fix the P0691 code on a 2016 GMC Sierra?
Repairs may involve replacing a faulty cooling fan relay, repairing damaged wiring, replacing the cooling fan motor, or reprogramming the PCM if necessary.
7. What tools are needed to troubleshoot the P0691 code?
You’ll need an OBDII scanner, multimeter, and possibly wiring diagrams to diagnose and repair the issue.
8. How much does it cost to fix a P0691 code on a 2016 GMC Sierra?
Repair costs vary, but replacing a cooling fan relay may cost $50-$150, while a fan motor replacement could cost $300-$600, depending on labor rates.
9. Can a dirty or corroded connector cause the P0691 code?
Yes, corroded or dirty connectors can disrupt the cooling fan circuit and trigger the P0691 code.
10. Does a P0691 code always mean the cooling fan motor is bad?
No, the issue could also stem from the relay, wiring, or PCM rather than the cooling fan motor itself. Proper diagnosis is essential.
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