Powertrain, generic (extended)

P2389 EGR Sensor E Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2389 points to an EGR sensor E signal that is mostly plausible but now and then jumps, spikes or drops out. Engine controllers detect this by watching the rate of change between consecutive readings rather than absolute limits. No manufacturer documents P2389 publicly; the nearest published example is GM's sensor D code P2384 on 2025 diesels, which counts readings that change by more than 10 % from one sample to the next and sets a Type A fault after 300 such events in 600 samples. Such faults tend to follow engine vibration, heat cycles or moisture, so connector locks, pin tension and harness routing near hot exhaust parts deserve the first look. A fault that is absent during testing may still return; P2385 to P2387 describe steady faults.

Likely causes

Weak pin tension or unlatched connector
Harness damaged by heat or rubbing near the exhaust
Moisture in the connector
Sensor with an intermittent internal fault

Symptoms

  • MIL on, sometimes going out again
  • Fault cannot be reproduced at the workshop
  • Jumps visible in the sensor E data stream

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–300
Time0.5–3 h

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

Parts involved

egr sensor eegr sensor wiring e

Related codes

P2385P2386P2387P2384

References: gsi.ext.gm.com, law.cornell.edu.