Powertrain, generic (extended)

P2387 EGR Sensor E Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2387 is stored when the signal of EGR sensor E falls below its valid electrical range. On a pressure sensor with a 5 V reference that typically points to a lost reference feed, a signal wire shorted to ground or a sensor that no longer drives its output; a shorted thermistor would produce the same result on a temperature input. No manufacturer documents P2387 publicly. GM's published limit for the comparable sensor D code P2382 on 2025 diesels is a raw value below 0.02 % of range in 480 of 600 samples, sampled every 6.25 ms after cranking. Because a dead 5 V reference often feeds several sensors at once, other low codes sharing that rail are a useful clue. P2386 covers the high side; EGR usually runs in a fallback mode meanwhile.

Likely causes

5 V reference open or pulled down by another sensor
Signal wire shorted to ground
Sensor without output signal

Symptoms

  • MIL on
  • Further low-voltage codes on sensors sharing the same reference
  • EGR in fallback mode

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–300
Time0.3–2 h

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

Parts involved

egr sensor e

Related codes

P2385P2386P2388P2382

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