What does code P1566 mean?

Q: What does code P1566 mean?

Load Signal From A/C Compressor Range Performance. P1566 on Volkswagen vehicles indicates that the engine control module (ECM) has detected an out-of-range load signal from the air conditioning (A/C) compressor. The ECM expects a specific voltage or duty cycle from the compressor's load sensor or clutch circuit, and the actual signal falls outside the valid range, triggering the code.

DTC codes / Volkswagen codes / P1566

P1566 · VolkswagenLoad Signal From A/C Compressor Range Performance

P1566 on Volkswagen vehicles indicates that the engine control module (ECM) has detected an out-of-range load signal from the air conditioning (A/C) compressor. The ECM expects a specific voltage or duty cycle from the compressor's load sensor or clutch circuit, and the actual signal falls outside the valid range, triggering the code.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.