Code result
P2522
A/C Request B Circuit
Moderate severity
What it means
General electrical fault on the second A/C request input B. Many vehicles have two HVAC zones, a rear evaporator request, or a redundant request line — input B carries that signal. With the input invalid, the ECM cannot honour zone B compressor demand or rear-evap operation.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Open or shorted A/C request wire B
highOne of the most commonly reported causes for this code — check this first.
HVAC module not transmitting request B
mediumA plausible cause — test and verify before replacing parts.
Related help
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