P2521
A/C Request A Circuit High
P2521 is an OBD-II diagnostic trouble code meaning: A/C Request A Circuit High. Common causes: short circuit to positive, faulty a/c relay. Estimated repair cost: $6–56.
Symptoms
- Air conditioner won't turn on
- Reduced cooling efficiency
- Hot air from vents
- Air conditioner light flashing
- Increased fuel consumption
Causes
- Short circuit to positive
- Faulty A/C relay
- Wiring harness damage
- Problems with the air conditioning control unit
- Refrigerant pressure sensor malfunction
How to Fix
- Check fuses and relays of the air conditioner
- Inspect the wiring harness for damage
- Check the resistance of the A/C request circuit
- Diagnose the air conditioning control unit
- If necessary, replace faulty components
Related codes
Error P2521 by Vehicle Brand
FAQ
What does the P2521 code mean?
P2521 is an OBD-II diagnostic trouble code that indicates: A/C Request A Circuit High
What causes a P2521 error code?
The most common causes of P2521 include: Short circuit to positive; Faulty A/C relay; Wiring harness damage; Problems with the air conditioning control unit.
How do I fix a P2521 diagnostic trouble code?
To fix P2521: Check fuses and relays of the air conditioner. Inspect the wiring harness for damage. Check the resistance of the A/C request circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P2521?
Yes, but get it checked soon
How much does it cost to fix P2521?
The estimated repair cost for P2521 is $6–56. Actual cost depends on your vehicle, location, and labor rates.
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