Powertrain, generic (extended)

P2381 EGR Sensor D Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

P2381 means the signal of EGR sensor D is stuck at the top of its electrical range. GM's 2025 diesel ECM tables use it for the differential pressure sensor of the low-pressure EGR loop: if the raw voltage exceeds 99.83 % of the scale in 480 out of 600 samples, taken every 6.25 ms after cranking and with the powertrain relay above 11 V, GM records a Type A fault, lighting the MIL in the first trip. Typical reasons are an open sensor ground or a signal wire touching a 5 V or battery feed. GM bulletin 21-NA-149 for 3.0L LM2 trucks (Silverado, Sierra, Tahoe, Suburban, Yukon, Escalade) lists P2381 among codes that chafed engine harnesses can trigger. P2382 is the opposite limit and P2383 the plausibility check of the same sensor. The low-pressure EGR is usually shut off.

Likely causes

Open sensor ground or reference return
Chafed engine harness shorting the signal to a supply (GM 21-NA-149)
Differential pressure sensor failed with output at full scale

Symptoms

  • Check engine light on immediately
  • Low-pressure EGR disabled, NOx emissions rise
  • Other harness-related codes possible at the same time

Repair estimate

DifficultyMediumDIY possible
Parts and labour€30–300
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

P2380P2382P2383P2384P0406

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