P256F

A/C Request B Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$6–56 (est.)

Symptoms

Air conditioner won't turn on
Intermittent operation of the air conditioner
Check Engine light comes on
Reduced engine power when the air conditioner is turned on

Causes

Open or short circuit in A/C B request circuit
Air conditioning relay malfunction
Problems with the climate control unit
Engine control unit (ECU) malfunction
Poor contact in circuit connectors

How to Fix

Check the continuity of the A/C B request circuit
Check the operation of the air conditioner relay
Diagnose the climate control control unit
Check connections and connectors in the circuit
If necessary, replace faulty components

Related codes

P256E P2570 P2571