Powertrain
generic / SAE
P2519
A/C Request A Circuit
General electrical fault on the A/C compressor request input A. This input tells the ECM that the HVAC controller wants the A/C compressor engaged. With the input invalid, the ECM cannot enable the compressor clutch — A/C does not cool, idle-up compensation is not applied.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 19
Possible causes
- Open or shorted A/C request wire high
- HVAC module not transmitting the request medium
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 80–500 €
- Estimated time: 0.4–2 h
- Component: ac request input a
- Component: hvac module
- MIL / check engine light
Sources
References
sae:J2012