Retarder B16
â–¶ How to fix
Check the signal to pin 49 in the connector for the gearbox control unit. Check the resistor for retarder B16. Refer to "Checking solenoid valves and sensors".
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Incorrect signal for retarder identification.
Possible cause
The gearbox control unit, pin 49, has detected that the voltage is, or has been, below 0.5 V.