P2521 OBD-II: A/C Request "A" Circuit High

P2521 Severity

Moderate

Will P2521 go away on its own?

Once the vehicle's onboard system no longer detects the issue, most codes will disappear on their own. If your vehicle still has this code, however, it should be properly diagnosed to avoid a more serious problem.

For a proper diagnosis, RepairPal Certified shops have the equipment, tools, and expertise.

Moderate severity codes might not threaten the vehicle's safety or functionality immediately, but you should still get it diagnosed within a reasonable time frame to keep your car running well.

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What causes OBD-II fault code P2521?

When the driver requests the A/C to be turned on, a signal goes from the switch to the engine computer (PCM). The PCM then sends power to the A/C Compressor to turn it on. If the Compressor fails to turn on, code P2521 will be stored.

OBD II Fault Code

OBD II P2521

OBD-II Code A/C may not operate is defined as a A/C Request "A" Circuit High

A/C may not operate Symptoms

A/C may not operate

Common Problems That Trigger the P2521 Code

A/C compressor failure
A/C compressor relay failure
Powertrain Control Module (PCM) failure
Wiring issue

OBD Code Resources

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OBD II Fault Code

OBD II P2521

OBD-II Code A/C may not operate is defined as a A/C Request "A" Circuit High

A/C may not operate Symptoms

A/C may not operate

Common Problems That Trigger the P2521 Code

A/C compressor failure
A/C compressor relay failure
Powertrain Control Module (PCM) failure
Wiring issue

P2521 OBD-II: A/C Request "A" Circuit High

Will P2521 go away on its own?

What causes OBD-II fault code P2521?

Need a P2521 diagnosis? Trust our experts.

OBD II Fault Code

A/C may not operate Symptoms

Common Problems That Trigger the P2521 Code

OBD Code Resources

Need a P2521 diagnosis? Trust our experts.

Ask our experts about P2521.

Other OBD-II Codes

OBD II Fault Code

A/C may not operate Symptoms

Common Problems That Trigger the P2521 Code