A/C Request A Circuit Low
The A/C compressor request input A reads stuck low — typically a short to ground or a permanently asserted request. The ECM either sees A/C demanded all the time (cannot release idle-up, raises fuel use) or cannot distinguish a real request from the stuck low level.
Affected components
- Ac request input a
Common causes
- High likelihood: Request wire shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
- Low likelihood: Harness chafing through insulation
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.