P256F OBD-II: A/C Request "B" Circuit Range/Performance

P256F Severity

Moderate

Will P256F 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 P256F?

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 P256F will be stored.

OBD II Fault Code

OBD II P256F

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

A/C may not operate Symptoms

A/C may not operate

Common Problems That Trigger the P256F Code

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

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Other OBD-II Codes

P256E: Engine Idle Speed Selector Sensor/Switch Circuit P256D: Engine Idle Speed Selector Sensor/Switch Circuit High P256C: Engine Idle Speed Selector Sensor/Switch Circuit Low P256B: Engine Idle Speed Selector Sensor/Switch Range/Performance

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OBD II Fault Code

OBD II P256F

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

A/C may not operate Symptoms

A/C may not operate

Common Problems That Trigger the P256F Code

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

P256F OBD-II: A/C Request "B" Circuit Range/Performance

Will P256F go away on its own?

What causes OBD-II fault code P256F?

Need a P256F diagnosis? Trust our experts.

OBD II Fault Code

A/C may not operate Symptoms

Common Problems That Trigger the P256F Code

Ask our experts about P256F.

Other OBD-II Codes

OBD Code Resources

Need a P256F diagnosis? Trust our experts.

OBD II Fault Code

A/C may not operate Symptoms

Common Problems That Trigger the P256F Code