OBD-II code · Powertrain (generic)
P04D0 EGR Temperature Sensor C Circuit Low
Same as P04CE with the signal voltage below the plausible range. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
Is it safe to drive with P04D0?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.6–1.6 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Temperature Sensor C
Related codes
- P040CEGR Temperature Sensor A Circuit Low
- P041CEGR Temperature Sensor B Circuit Low
- P04E7EGR Temperature Sensor D Circuit Low
- P04CDFuel Fill Door Open Request Sensor or Switch Stuck On
- P04CEEGR Temperature Sensor C Circuit
- P04CFEGR Temperature Sensor C Circuit Range or Performance
- P04D1EGR Temperature Sensor C Circuit High
- P04D2EGR Temperature Sensor C Circuit Intermittent or Erratic
- P04D3Exhaust Brake Input Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.