P04E5

What it means

P04E5 means the engine control unit has detected a fault in the circuit of EGR temperature sensor 'D'. The sensor's signal was outside the expected range or did not make sense for the operating conditions. Which sensor is 'D', and the exact fault condition, depends on the engine and the manufacturer's sensor layout.

Symptoms

• Engine management light on
• Reduced power or the engine running in a limited mode on some vehicles
• Rough running or hesitation at light load
• Increased smoke or higher NOx emissions that may cause an emissions test failure
• Other EGR-related codes stored alongside

Possible causes

• Faulty EGR temperature sensor D (internal open or short circuit, or sensor drift)likely
• Damaged, chafed, corroded or heat-affected wiring or connector to the sensorlikely
• Sooty or contaminated sensor tip giving a slow or incorrect readingpossible
• EGR valve stuck open or closed, or a blocked or leaking EGR cooler, giving temperatures that do not match expectationspossible
• Fault in the sensor's reference voltage or ground supply shared with other sensorspossible
• Fault in the engine control unit or its software calibrationrare

How to diagnose

1. Read all stored and pending codes and the freeze frame data, noting engine temperature, load and speed when the code set
2. Check for other EGR, boost or sensor supply codes that point to a shared cause
3. Inspect the sensor, its wiring and connector for damage, heat damage, corrosion, moisture or a loose pin fit
4. Look up the manufacturer data to identify the location of sensor D on this engine and its expected resistance or voltage values
5. Check live data for the sensor reading against other temperature sensors on a cold engine; it should be close to ambient
6. Test the sensor circuit for a reference voltage, ground and signal wire continuity, and for shorts to ground or supply
7. Measure the sensor's resistance against the specification at a known temperature, and check the live reading while the EGR is operated
8. Check the EGR valve operation and look for blockage or contamination in the EGR cooler and passages, following the manufacturer's procedure

How to fix

• Replace the EGR temperature sensor if it fails the resistance or live data checks
• Repair or replace damaged wiring, terminals or the connector, and secure the harness away from heat sources
• Clean or replace a contaminated EGR valve, or repair a leaking or blocked EGR cooler as the manufacturer specifies
• Repair any shared reference voltage or ground fault found in the circuit
• Update the control unit software only if the manufacturer lists an outdated calibration as a known cause for this code

Can I keep driving?

Nearby codes

• P04E4GenericCrankcase Ventilation Hose Connection Sensor Circuit Intermittent/Erratic
• P04E6GenericEGR Temperature Sensor D Circuit Range/Performance