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I was resetting my service reminder when I noticed the following codes on my PDK box:


U0155: CAN timeout instrument cluster

U0146: CAN timeout gateway

U0418: CAN fault brake

1990: Positive engine torque intervention not possible

U0423: CAN fault instrument cluster


The car seems to run fine but I can’t clear the codes with the durametric and a battery reset didn’t help either. Any ideas?


Thanks for any pointers you may have. Hoping I’m not in for a $$$$ bill.




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U0155 Instrument cluster, communication

Possible fault causes

- No power supply for instrument cluster
- Instrument cluster incorrectly coded
- Short circuit or open circuit in the CAN display
- Instrument cluster faulty (in most cases the cause is not the instrument cluster but incorrect coding!)



U0146 Gateway control unit communication

Possible fault causes

- No power supply for Gateway control unit
- Incorrect coding of Gateway control unit
- Short circuit or open circuit of CAN Drive
- Gateway control unit faulty (in most cases the cause is incorrect coding and not the Gateway control unit!)



U0418 Stop light switch

Possible fault causes

- Open circuit in signal wire from stop test switch
- Stop light switch faulty



U0423 Fault entry in specified control module

Possible fault causes

- Control module is incorrectly coded
- Periphery connected to specified control module is incorrect
- Control module faulty (in most cases the cause is not the control module but incorrect coding!)


1990 Positive engine torque intervention not possible

Possible fault causes

- Fault in CAN bus
- DME control unit detects engine fault


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