P1018
Reductant Control Module Sensor Communication Voltage Supply Circuit Low Voltage
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)
Symptoms
- Check Engine light comes on
- Reduced engine power
- Increased fuel consumption
- Possible emergency operation of the engine
- Increased emissions of nitrogen oxides
Causes
- Open or short circuit in the sensor power supply circuit
- Faulty reducer module
- Fuse problems
- Wiring harness damage
- Engine ECU malfunction
How to Fix
- Check power supply fuses
- Inspect the wiring harness for damage
- Check the voltage at the reducer module sensor
- Test the reductant module
- If necessary, replace the module or repair the wiring