P0691 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 Chevrolet Silverado Code
1. What does the OBDII code P0691 mean on a 2016 Chevrolet Silverado?
P0691 indicates a low voltage issue in the cooling fan speed output circuit, which controls the operation of the cooling fan.
2. What are the common symptoms of P0691 in a 2016 Chevrolet Silverado?
Symptoms may include engine overheating, the cooling fan not turning on, reduced air conditioning performance, and the Check Engine Light illuminating.
3. What causes the P0691 code to appear in my Silverado?
Common causes include a faulty cooling fan relay, damaged wiring or connectors, a defective cooling fan motor, or a failing powertrain control module (PCM).
4. Can I drive my Silverado with the P0691 code active?
It’s not recommended, as the cooling fan may not function properly, potentially leading to engine overheating and serious engine damage.
5. How do I diagnose the P0691 code on a 2016 Chevrolet Silverado?
Diagnosis involves inspecting the cooling fan relay, wiring, and connectors for damage, testing the cooling fan motor, and checking for proper voltage and ground signals in the circuit.
6. How do I fix the P0691 code on my Silverado?
Repairs may include replacing a faulty cooling fan relay, repairing damaged wiring, cleaning or reconnecting corroded connectors, or replacing the cooling fan motor if necessary.
7. Can a bad cooling fan motor trigger the P0691 code?
Yes, a failing or shorted cooling fan motor can result in low voltage in the circuit, triggering the P0691 code.
8. Will clearing the P0691 code fix the problem on my Silverado?
Clearing the code will turn off the Check Engine Light temporarily, but the underlying issue must be fixed to prevent the code from returning.
9. How much does it cost to repair the P0691 code on a 2016 Chevrolet Silverado?
Repair costs vary depending on the exact issue, but replacing a cooling fan relay typically costs $50-$150, while a cooling fan motor replacement may cost $300-$600.
10. Can a faulty PCM cause a P0691 code in my 2016 Silverado?
While rare, a failing PCM can cause the P0691 code if it’s not sending the correct signals to the cooling fan circuit. This should be diagnosed only after ruling out other causes.
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