Powertrain, generic (extended)

P24AD EGR Cooler Coolant Pump Feedback Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P24AD is the high-side counterpart of P24AC: the return signal from the EGR cooler coolant pump stays above its valid band. Since such feedback lines are usually pulled up inside the controller, a broken wire or a disconnected pump often shows as a constantly high level, as can a short to a voltage feed. The pump itself may still run normally, but the controller can no longer prove it. As with the low-side code, no maker discloses the band, so the general CARB input checks are the reference. A practical first step is to compare the feedback signal with the command while the pump is triggered from a scan tool, then check the line for continuity and for voltage from other circuits.

Likely causes

Feedback wire broken or pump unplugged, line pulled high
Feedback wire shorted to a voltage feed
Pump electronics no longer pulling the signal down

Symptoms

  • Malfunction indicator lamp on
  • Often no noticeable effect while driving

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–450
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

egr cooler coolant pump

Related codes

P24ACP24A7P24AA

References: law.cornell.edu, ms-motorservice.com.