road speed sensor
â–¶ How to fix
Pair the tachograph and road speed sensor using the test instrument if necessary. Try again if unsuccessful.Check the cable harness and connectors.Check that the road speed sensor is correctly fitted.Check the road speed sensor.Check pin B4 on the tachograph.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The tachograph cannot identify the road speed sensor.
Possible cause
The fault code is generated if the tachograph or road speed sensor have been renewed without being paired afterwards. Short-circuit or open-circuit in the cable harness between the road speed sensor and tachograph. Internal fault in the road speed sensor. Fault in the tachograph.