P0642, P0643
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE lamp on.
Car in limp-home mode.
P0642:
Voltage Supply Group 1. Short to Ground.
P0643:
Voltage Supply Group 1. Short to B+.
Fault symptoms
Conditions
The following conditions apply for this DTC:
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P0642:
The power supply is shorted to ground. The output voltage is below 4.6 V for 0.2 seconds.
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P0643:
The power supply is shorted to the battery voltage. The output voltage above 5.4 V for 0.2 seconds.
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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).