P2381EGR Sensor D Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- Check engine light on immediately
- Low-pressure EGR disabled, NOx emissions rise
- Other harness-related codes possible at the same time
- Likely causes
- LikelyOpen sensor ground or reference return
- PossibleChafed engine harness shorting the signal to a supply (GM 21-NA-149)
- PossibleDifferential pressure sensor failed with output at full scale
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.