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P0642, P0643

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE lamp on. Car in limp-home mode.

P0642, P0643


P0642: Voltage Supply Group 1. Short to Ground.

P0643: Voltage Supply Group 1. Short to B+.


Fault symptoms


• CHECK ENGINE lamp on.

• Car in limp-home mode.


Conditions

The following conditions apply for this DTC:


• P0642: The power supply is shorted to ground. The output voltage is below 4.6 V for 0.2 seconds.

• P0643: The power supply is shorted to the battery voltage. The output voltage above 5.4 V for 0.2 seconds.


Diagnostic help

If there is a fault, the car reacts according to the limp-home values it receives for boost pressure (100 kPa/1 bar) and charge air temperature (20°C).

Note

A fault in the control module female connector can cause a trouble code. Check the contact for a bent pin, oxidation and tightness of pins. See Difficult faults in PSG16 despite trouble code