Powertrain, generic (extended)

P2384 EGR Sensor D Circuit Intermittent

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2384 marks an EGR sensor D signal that jumps or drops out for brief moments without staying at a fixed fault level. GM's 2025 diesel ECM tables apply it to the differential pressure sensor of the low-pressure EGR loop: when two successive raw readings differ by more than 10 % in 300 out of 600 samples, taken every 6.25 ms with the relay supply above 11 V and no high or low circuit fault present, a Type A fault is logged and the MIL comes on in the first trip. GM bulletin 20-NA-039 lists P2384 among several codes on 2020 Silverado and Sierra 1500 trucks with the 3.0L LM2 diesel that a software anomaly could cause, cured by ECM reprogramming. Outside such cases loose terminals and chafed wiring are typical; P2381 to P2383 are the steady faults.

Likely causes

Loose or corroded terminals at the EGR sensor D connector
Harness chafing intermittently on engine or exhaust parts
ECM software anomaly (GM 3.0L LM2 2020, bulletin 20-NA-039)
Sensor with an internal contact fault

Symptoms

  • MIL on, often without noticeable driving change
  • Code stored, cleared and returning after some drives
  • EGR operation reduced as a precaution

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 degr sensor wiring d

Related codes

P2380P2381P2382P2383P2389

References: gsi.ext.gm.com, static.nhtsa.gov, law.cornell.edu.