Powertrain, generic (extended)

P2383 EGR Sensor D Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2383 flags an EGR sensor D whose signal is electrically fine but makes no sense. Two published strategies show how differently makers test it. GM's 2025 diesel ECM tables check the low-pressure EGR differential pressure sensor at key-off, when there should be no pressure difference: if the averaged reading exceeds 6 %, a Type A fault is set at once, provided no circuit or intermittent fault is present. Ford's 2024–2025 petrol summary uses P2383 for reversed hoses on its EGRP pressure sensor, judged by a signal off by more than 10 kPa or an internal temperature off by more than 27.7 °C for 5 seconds. GM bulletin 21-NA-149 adds harness checks at the sensor connector on 3.0L LM2 trucks. Mixed-up or cracked hoses, a drifting sensor and soot in the lines are the usual suspects.

Likely causes

Sensor hoses swapped, cracked or disconnected (Ford EGRP)
Sensor drifted so that it reads a pressure difference with the engine off (GM)
Sensing lines blocked by soot or condensate
Intermittent wire break at the sensor connector (GM 21-NA-149)

Symptoms

  • Check engine light on
  • EGR rate reduced or switched off
  • Often appears after work on the EGR or exhaust system

Repair estimate

DifficultyMediumDIY possible
Parts and labour€10–300
Time0.3–2 h

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

Parts involved

egr sensor degr diff pressure sensor

Related codes

P2380P2381P2382P2384P0401P0409

References: gsi.ext.gm.com, fordservicecontent.com, static.nhtsa.gov.