Road speed sensor
â–¶ How to fix
Pair the tachograph and road speed sensor using the test instrument if necessary.Check the cable harness and connectors.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 encrypted signal from the road speed sensor has been interrupted or detected as being incorrect.
Possible cause
The fault code can be 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.