P0691 2014 Chevrolet Silverado Code - Cooling Fan Speed Output Circuit Low Voltage
Quick Answer
The engine cooling fan system is composed of 2 electric cooling fans, fan motors, and 2 control modules. Common causes include Faulty Cooling Fan Control Module, Cooling Fan Control Module harness is open or shorted, Cooling Fan 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
- P0691 2014 Chevrolet Silverado indicates Cooling Fan Speed Output Circuit Low Voltage.
- Common causes
- Common causes include Faulty Cooling Fan Control Module, Cooling Fan Control Module harness is open or shorted, Cooling Fan 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 P0691 2014 Chevrolet Silverado Description
The cooling fan speed is affected by many different conditions and the ECM will adjust the duty cycle from 0 - 100 percent based on cooling system requirements. The scan tool output control is only capable of operating the cooling fan increments, between 10 - 90 percent. 90 percent is considered high-speed fan. When multiple cooling fan speed requests are received, the ECM operates the fan at the highest speed requests.
The Diagnostic Trouble Code (DTC) will be set when the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.
What are the Possible Causes of the DTC P0691 2014 Chevrolet Silverado?
- Faulty Cooling Fan Control Module
- Cooling Fan Control Module harness is open or shorted
- Cooling Fan Control Module circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0691 2014 Chevrolet Silverado?
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 P0691 2014 Chevrolet Silverado 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 P0691 2014 Chevrolet Silverado Code
1. What does the OBDII code P0691 mean on a 2014 Chevrolet Silverado?
P0691 indicates a low voltage issue in the Cooling Fan Speed Output Circuit, which controls the cooling fan's operation.
2. What are the common symptoms of code P0691 on a 2014 Chevrolet Silverado?
Symptoms may include the engine overheating, the cooling fan not operating, or the check engine light being illuminated.
3. What are the possible causes of the P0691 code?
Common causes include a faulty cooling fan relay, damaged cooling fan motor, wiring issues like shorts or open circuits, or a malfunctioning Engine Control Module (ECM).
4. Can I drive my 2014 Chevrolet Silverado with a P0691 code?
Driving with a P0691 code is not recommended, as it can lead to engine overheating and potential damage to the engine components.
5. How is the P0691 code diagnosed on a 2014 Chevrolet Silverado?
A technician will inspect the cooling fan circuit, test the fan relay and motor, check for wiring damage, and use a scan tool to monitor voltage and resistance in the circuit.
6. What repairs can fix the P0691 code on my Silverado?
Repairs may include replacing a faulty cooling fan relay, repairing or replacing damaged wiring, replacing the cooling fan motor, or reprogramming or replacing the ECM.
7. How much does it cost to repair a P0691 code on a 2014 Chevrolet Silverado?
Repair costs can vary but typically range from $100 to $500, depending on whether the issue involves wiring, the relay, or the cooling fan motor.
8. Can a weak battery cause the P0691 code?
Yes, a weak battery or charging system issues can lead to insufficient power, potentially triggering the P0691 code.
9. How can I prevent the P0691 code from recurring?
Regularly inspect the cooling fan system, check for corroded or damaged wiring, and ensure the battery and charging system are in good condition.
10. Is the P0691 code specific to the 2014 Chevrolet Silverado?
No, the P0691 code can appear on other vehicles with similar cooling fan circuit designs, but the diagnosis and repair steps may vary.
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