P1478
Particulate Matter Sensor Temperature Circuit High Voltage
Severity
⚠️ MediumCan you drive?
Yes, but get it checked soon
Approx. repair cost
$33–89 (est.)
Symptoms
- Check Engine Light Is On
- Reduced engine power
- Increased fuel consumption
- Problems with diesel particulate filter regeneration
- Unstable engine idling
Causes
- Short circuit in the sensor circuit
- Particle temperature sensor malfunction
- Wiring harness damage
- Problems with the engine control unit
- Contact corrosion
How to Fix
- Check the integrity of the sensor wiring harness
- Measure resistance and voltage at the sensor
- Replace particle temperature sensor if necessary
- Clean or replace damaged wires
- Reset the error code and check the system