OBD Guide
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P1478

Particulate Matter Sensor Temperature Circuit High Voltage

P1478 is an OBD-II diagnostic trouble code meaning: Particulate Matter Sensor Temperature Circuit High Voltage. Common causes: short circuit in the sensor circuit, particle temperature sensor malfunction. Estimated repair cost: $33–89.

Severity
⚠️ Medium
Can 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

  1. Check the integrity of the sensor wiring harness
  2. Measure resistance and voltage at the sensor
  3. Replace particle temperature sensor if necessary
  4. Clean or replace damaged wires
  5. Reset the error code and check the system

Related codes

P1479P1480P1481

Error P1478 by Vehicle Brand

DodgeJeepVolkswagen

FAQ

What does the P1478 code mean?

P1478 is an OBD-II diagnostic trouble code that indicates: Particulate Matter Sensor Temperature Circuit High Voltage

What causes a P1478 error code?

The most common causes of P1478 include: Short circuit in the sensor circuit; Particle temperature sensor malfunction; Wiring harness damage; Problems with the engine control unit.

How do I fix a P1478 diagnostic trouble code?

To fix P1478: Check the integrity of the sensor wiring harness. Measure resistance and voltage at the sensor. Replace particle temperature sensor if necessary. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P1478?

Yes, but get it checked soon

How much does it cost to fix P1478?

The estimated repair cost for P1478 is $33–89. Actual cost depends on your vehicle, location, and labor rates.

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