2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 298
Fault code
2F12 - P0645
Fault text
Air-conditioning compressor, activation
Fault description
A/C Clutch Relay Control Circuit
Condition for fault identification
Test condition:
Air conditioner relay control-activation monitor; air
conditioning initialized
Briefly triggered by relay
Air conditioning installed and
switched on
Terminal condition: Terminal 15 ON
Voltage condition:
Voltage in onboard electrical system > 10 V
Condition for fault memory entry
1 sec.
Action in service
2. Check wiring
Repair if defective
If wiring is OK proceed
to check component, a/c compressor relay
Fault effect and breakdown warning
Driver information
Warning light:
no external display;
Service instruction
none
2F12 - P0646 (DME)
2F12 - P0646
Information saved in
DME
Fault code
2F12 - P0646
Fault text
Air-conditioning compressor, activation
Fault description
A/C Clutch Relay Control Circuit Low
Condition for fault identification
Test condition:
Air conditioner relay control-activation monitor; air
conditioning initialized
Briefly triggered by relay
Air conditioning installed and
switched on
Terminal condition: Terminal 15 ON
Voltage condition:
Voltage in onboard electrical system > 10 V
Condition for fault memory entry
