DTC P05F8-66: Reductant Heater Control Module Performance - Signal has too many transitions/events: Action
- Vehicle Conditions to enable DTC Logging Strategy
- Prioritized Checks to Perform
- Refer to the appropriate System Wiring Diagram(s) and check the diesel exhaust fluid heater control unit circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
- Check and install a new diesel exhaust fluid heater control unit as required
- Using the Jaguar Land Rover approved diagnostic equipment, clear the DTCs and retest