P2387EGR Sensor E Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- 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.
- What you may notice
- MIL on
- Further low-voltage codes on sensors sharing the same reference
- EGR in fallback mode
- Likely causes
- Likely5 V reference open or pulled down by another sensor
- PossibleSignal wire shorted to ground
- PossibleSensor without output signal
- 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: €0 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.