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Definition of check engine code P1546:
GM:
A/C Clutch Status Circuit Low Voltage
Isuzu:
A/C Compressor Clutch Output Circuit Malfunction
Opel:
AC compressor clutch,signal - circuit malfunction
Volkswagen/Audi:
Boost Pressure Contr. Valve Short to B +
Volvo:
Boost Pressure Contr. Valve Short to B +