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).
CONNECTOR
^ Check for connector not correctly latched, backed out pins, damaged pins, corroded pins.

Open Circuit - C637/22 (KG) to C504/3 (KG).
OPEN_CIRCUIT
^ 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.