P0501

DTC P0501
Vehicle speed sensor signal error Drive cycle B:Signal implausible.

Possible causes by suggested order of priority:
- Connectors C504, C290, ECM C637 (B).
- Open circuit - C637/22 (KG) to C504/3 (KG).
- ABS or Wheel sensor fault.

Connectors C504, C290, ECM C637 (B).
- Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

Open circuit - C637/22 (KG) to C504/3 (KG).
- Check resistance > 1M Ohm

ABS or Wheel sensor fault.
CHECK THE FOLLOWING:
- Carry out diagnostic checks on the ABS system.
- Check that ABS system can measure road speed correctly.
- Check engine speed measured by ABS on road test or rolling road.

NOTE: The Motronic will not measure road speed if the engine is not running.

POSSIBLE FAULTS
- Faulty ABS speed sensor or wiring.
- Faulty ABS ECU.