Powertrain
generic / SAE
P24D4
EGR Cooler Coolant Pump Feedback Circuit
A general circuit fault on the feedback line that the EGR cooler coolant pump reports speed on. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number4 / D4
Possible causes
- Open in feedback wiring high
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 200–800 €
- Estimated time: 1–3 h
- Component: egr cooler coolant pump
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012