What are the common causes of P255F?

An A/C request A signal outside its expected range. An open or short in the A/C request A circuit. Corrosion at the A/C request A connector. Low refrigerant charge stalling the request.

Read A/C request A on a scan tool. Test the A/C request A circuit for open and short faults. Check the A/C request A connector for corrosion. Check the refrigerant charge. Replace the A/C control module if the circuit and charge test good. Clear the code and retest.

P255F

A/C Request A Circuit Range/Performance

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P255F means A/C Request A Circuit Range/Performance.

Check these first

An A/C request A signal outside its expected range
An open or short in the A/C request A circuit
Corrosion at the A/C request A connector
Low refrigerant charge stalling the request

What to do next

Read A/C request A on a scan tool
Test the A/C request A circuit for open and short faults
Check the A/C request A connector for corrosion
Check the refrigerant charge
Replace the A/C control module if the circuit and charge test good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.