P2521 Fault Code

A/C Request A Circuit High

• What does that mean?
• Symptoms
• Causes
• Solutions

The P2521 fault code indicates an issue with the A/C request A circuit, specifically a high voltage condition. This code usually points to a problem where the A/C control module is receiving an unexpected high signal from the A/C request circuit, which could be due to a wiring issue or a malfunctioning component. It's important to note that this can affect the overall performance of the vehicle's air conditioning system, resulting in poor cabin comfort levels.

What are the symptoms of the P2521 code?

• A/C system may not engage or function properly.
• Cabin may not be adequately cooled.
• Dashboard warning light may illuminate indicating an A/C issue.
• Possible unusual noises from the A/C system when attempting to operate.

What causes the P2521 code?

• Short circuit in the A/C request circuit.
• Faulty A/C control module.
• Damaged wiring harness or connectors.
• Malfunctioning sensors that affect the A/C operation.

How to fix P2521?

• Inspect the wiring and connectors associated with the A/C request circuit for any signs of damage or corrosion.
• Test the A/C control module to ensure it is functioning correctly and replace if necessary.
• Use a multimeter to check voltage levels in the circuit and diagnose any shorts.
• Clear the fault codes and recheck the system to ensure the problem is resolved.