Powertrain, generic (extended)

P24AA EGR Cooler Coolant Pump Control Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

With P24AA the controller finds the control line of the EGR cooler coolant pump at a higher voltage than its switching state allows. The classic causes are a short circuit toward battery voltage, for example where the harness rubs against a powered wire, moisture in the connector, or a pump that no longer draws current so the line floats up. On some designs an open circuit can look like a high signal, so P24A7 and P24AA may appear together. Manufacturer limits are not public; the general CARB duty to watch actuator wiring plus supplier background on the cooler support this text. Measuring supply, ground and control voltage with the connector plugged in usually separates a wiring fault from a failed pump.

Likely causes

Control wire shorted to a battery voltage feed
Water or corrosion in the pump connector
Pump electronics failed so no current is drawn

Symptoms

  • Malfunction indicator lamp on
  • Pump may not run when commanded

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

P24A9P24A7P24AB

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