P0691 Audi Code - Fan 1 Control Circuit Low
Quick Answer
The Engine Control Module (ECM) monitors the Cooling Fan 1 Control Circuit. Common causes include Faulty Fan 1 Relay, Fan 1 Relay harness is open or shorted, 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 Audi indicates Fan 1 Control Circuit Low.
- Common causes
- Common causes include Faulty Fan 1 Relay, Fan 1 Relay harness is open or shorted, 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 Audi Description
What are the Possible Causes of the DTC P0691 Audi?
- Faulty Fan 1 Relay
- Fan 1 Relay harness is open or shorted
- Fan 1 Relay circuit poor electrical connection
- Faulty Fan 1
- Fan 1 harness is open or shorted
- Fan 1 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0691 Audi?
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 Audi 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 Audi Code
1. What does the OBDII code P0691 mean on an Audi?
P0691 indicates a problem with the Fan 1 Control Circuit, specifically that the voltage is lower than expected.
2. What are the common symptoms of the P0691 code in an Audi?
Symptoms may include the radiator fan not working, engine overheating, illumination of the check engine light, or reduced air conditioning performance.
3. What causes the P0691 code to be triggered in an Audi?
Common causes include a faulty radiator fan, a damaged fan relay, a short or open in the wiring, or a malfunctioning engine control module (ECM).
4. Can I drive my Audi with the P0691 code?
It’s not recommended, as the cooling fan may not function properly, potentially causing the engine to overheat and leading to severe damage.
5. How do I diagnose the P0691 code in my Audi?
Start by inspecting the fan, relay, and wiring for visible damage. Use a multimeter to test for voltage and continuity in the circuit. If these components are fine, the ECM may need to be tested.
6. What repairs can fix the P0691 code in an Audi?
Possible repairs include replacing a faulty radiator fan, repairing or replacing damaged wiring, replacing the fan relay, or reprogramming or replacing the ECM if necessary.
7. How much does it cost to fix the P0691 code on an Audi?
Repair costs can vary widely, ranging from $50 to $300 for a new relay or wiring repair, and upwards of $500 or more if the radiator fan or ECM needs replacement.
8. Can a blown fuse cause the P0691 code in an Audi?
Yes, a blown fuse in the cooling fan circuit can result in insufficient voltage and trigger the P0691 code.
9. How can I prevent the P0691 code from occurring again?
Regularly inspect and maintain the cooling system components, including the fan, wiring, and relays, to ensure they are in good working condition.
10. Will resetting the check engine light clear the P0691 code on my Audi?
Resetting the light may temporarily clear the code, but it will return unless the underlying issue is resolved.
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