B0108

What it means

B0108 is the generic code for a fault in the LIDAR washer actuator 'C' circuit or its operation. The control unit that manages the LIDAR sensor cleaning system commanded or monitored the washer actuator and saw a reading outside the expected range, such as an open circuit, short, or no response. Which actuator 'C' refers to, and the exact failure type, depends on the vehicle, so check the manufacturer's data for the model.

Symptoms

• Warning message or light for a driver assistance or sensor cleaning fault
• LIDAR sensor cover is not cleaned when the washer is commanded
• Adaptive cruise, collision warning or similar driver assistance features limited or unavailable
• Washer fluid not reaching the LIDAR sensor window, or constant or uncontrolled spraying
• Fault stored with no other obvious driving symptoms

Possible causes

• Damaged, corroded or loose wiring or connector at the LIDAR washer actuator (pump, valve or nozzle motor)likely
• Faulty washer actuator (pump, valve or nozzle mechanism) that is seized, blocked or electrically failedlikely
• Blocked or frozen washer line or nozzle, or low or empty washer fluid, causing the actuator to be out of range or unresponsivepossible
• Blown fuse or a power or earth supply fault to the washer circuitpossible
• Water ingress or damage at the front of the vehicle after a minor impact or repair, affecting the actuator or its harnesspossible
• Fault in the controlling module or an outdated software version, where the manufacturer has documented thisrare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, and note whether other LIDAR, driver assistance or washer codes are present.
2. Check the washer fluid level and top it up with a suitable fluid, then operate the LIDAR washer function if the vehicle allows it and see if the sensor is sprayed.
3. Visually inspect the LIDAR sensor area, nozzle, washer lines and actuator for blockage, ice, kinks, leaks, impact damage or poor refitting after bodywork.
4. Inspect the actuator wiring and connectors for corrosion, water, bent pins and chafing, and check the relevant fuse.
5. Using the manufacturer's wiring diagram, check the actuator for supply, earth and control signal, and measure the circuit for open or short faults.
6. Activate the actuator using a scan tool's bidirectional test, if supported, and listen for or observe operation.
7. Check for any manufacturer service information or software updates relating to this code for the specific model.
8. Clear the code after repair and retest to confirm it does not return.

How to fix

• Repair or replace damaged wiring and clean or replace corroded connectors.
• Replace the faulty LIDAR washer actuator (pump, valve or nozzle unit) as specified for the model.
• Clear blocked or frozen lines and nozzles, replace damaged hoses and use the correct washer fluid for the season.
• Replace the blown fuse once the cause of the overload has been found, and restore any faulty power or earth supply.
• Update the control unit software only where the manufacturer lists it as a fix, or replace the module if it is confirmed faulty.

Can I keep driving?

Nearby codes

• B0107GenericLIDAR Washer Actuator B
• B0109GenericLIDAR Washer Actuator D