P0691 Cadillac Code - Cooling Fan 1 Control Circuit Low
Quick Answer
The engine cooling fan system is composed of electric cooling fan and a cooling fan control module. Common causes include Faulty Cooling Fan 1 Relay, Cooling Fan 1 Relay harness is open or shorted, Cooling Fan 1 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
- P0691 Cadillac indicates Cooling Fan 1 Control Circuit Low.
- Common causes
- Common causes include Faulty Cooling Fan 1 Relay, Cooling Fan 1 Relay harness is open or shorted, Cooling Fan 1 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 P0691 Cadillac Description
Generally, the ECM will operate the cooling fan at specific percentages but, may scale the percentages either higher or lower in response to generator demand. The percentages at which the cooling fan operates may vary between vehicle lines and engines.
The cooling fan control module is thermally protected to prevent module damage in the case of a short circuit condition in the cooling fan motor. The scan tool output control is only capable of operating the cooling fan in the speed percentages allowed by the ECM. When multiple cooling fan speed requests are received, the ECM operates the fan at the highest of the 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.
**Cooling Fan design may vary
What are the Possible Causes of the DTC P0691 Cadillac?
- Faulty Cooling Fan 1 Relay
- Cooling Fan 1 Relay harness is open or shorted
- Cooling Fan 1 Relay circuit poor electrical connection
- Faulty Cooling Fan 1
- Faulty Cooling Fan Control Module
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0691 Cadillac?
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 Cadillac 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 Cadillac Code
1. What are the common symptoms of OBDII code P0691 in a Cadillac related to Cooling Fan 1 Control Circuit Low?
The common symptoms include the cooling fan not working properly, overheating of the engine, and the Check Engine light being illuminated on the dashboard.
2. What are the potential causes of OBDII code P0691 in a Cadillac indicating Cooling Fan 1 Control Circuit Low?
Possible causes include a faulty cooling fan motor, a malfunctioning cooling fan relay, damaged wiring or connectors in the cooling fan circuit, or a problem with the engine control module (ECM).
3. How can I diagnose the OBDII code P0691 in a Cadillac for Cooling Fan 1 Control Circuit Low?
Diagnosis involves checking the cooling fan operation by testing the fan motor, relay, and related wiring for continuity and proper voltage. Using a scan tool to monitor the ECM data can also help pinpoint the issue.
4. What are the recommended repair tips for resolving OBDII code P0691 in a Cadillac concerning Cooling Fan 1 Control Circuit Low?
Repair tips may include replacing a faulty cooling fan motor, repairing or replacing damaged wiring or connectors, testing and replacing the cooling fan relay if necessary, and ensuring proper ECM function.
5. Can I continue to drive my Cadillac with OBDII code P0691 for Cooling Fan 1 Control Circuit Low?
It is not recommended to drive the vehicle with this code present, as it can lead to engine overheating and potential damage. It is best to address the issue promptly to prevent further problems.
6. How much does it typically cost to repair OBDII code P0691 in a Cadillac related to Cooling Fan 1 Control Circuit Low?
The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $500 or more, including parts and labor.
7. Are there any preventive maintenance steps to avoid OBDII code P0691 in a Cadillac for Cooling Fan 1 Control Circuit Low?
Regularly inspecting the cooling fan system, keeping the cooling system well-maintained, and addressing any cooling system issues promptly can help prevent this code from occurring.
8. Can a DIY enthusiast fix OBDII code P0691 in a Cadillac concerning Cooling Fan 1 Control Circuit Low?
While some simple checks and repairs can be performed by DIY enthusiasts, diagnosing and repairing complex electrical issues like this code may require professional assistance to ensure proper resolution.
9. How long does it take to repair OBDII code P0691 in a Cadillac related to Cooling Fan 1 Control Circuit Low?
The repair time can vary depending on the exact cause of the issue and the expertise of the technician, but it may take anywhere from a few hours to a full day to diagnose and fix the problem.
10. Will resetting the OBDII code P0691 in a Cadillac related to Cooling Fan 1 Control Circuit Low make it go away permanently?
Simply resetting the code without addressing the underlying issue will not make it go away permanently. The problem causing the code needs to be diagnosed and repaired to prevent it from recurring.
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