P0691 2015 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 2015 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 2015 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 2015 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 2015 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 2015 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 2015 Chevrolet Silverado Code
1. What does the OBDII code P0691 mean on a 2015 Chevrolet Silverado?
P0691 indicates a low voltage issue in the cooling fan speed output circuit, which can affect the operation of the cooling fan.
2. What are the symptoms of code P0691 in a 2015 Chevrolet Silverado?
Common symptoms include the engine overheating, the cooling fan not activating, or the Check Engine Light being illuminated.
3. What causes code P0691 on a 2015 Chevrolet Silverado?
Causes may include a faulty cooling fan relay, damaged wiring or connectors, a defective cooling fan motor, or a malfunctioning powertrain control module (PCM).
4. Can I drive my 2015 Chevrolet Silverado with a P0691 code?
Driving with a P0691 code is not recommended, as it can lead to engine overheating and potential damage if the cooling fan fails to operate properly.
5. How do I diagnose the P0691 code on a 2015 Chevrolet Silverado?
Diagnosis involves checking the cooling fan relay, inspecting the wiring and connectors for damage or corrosion, testing the cooling fan motor, and verifying proper voltage at the circuit.
6. How do I fix the P0691 code on a 2015 Chevrolet Silverado?
Repairs may include replacing the cooling fan relay, repairing or replacing damaged wiring or connectors, replacing the cooling fan motor, or reprogramming the PCM if necessary.
7. How much does it cost to fix a P0691 code on a 2015 Chevrolet Silverado?
Repair costs can vary but typically range from $100 to $500 depending on whether the issue is with the relay, wiring, or cooling fan motor.
8. Can a bad cooling fan relay cause the P0691 code?
Yes, a bad cooling fan relay is a common cause of the P0691 code, as it can prevent the cooling fan from receiving proper voltage.
9. Will clearing the P0691 code solve the problem in my 2015 Chevrolet Silverado?
Clearing the code without addressing the underlying issue will not solve the problem, and the code is likely to return.
10. Is the P0691 code related to other cooling system issues?
Yes, the P0691 code may be linked to other cooling system issues like a malfunctioning thermostat, low coolant levels, or a failing temperature sensor.
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