P2EADReductant Metering Unit 2 Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- Some diesels dose DEF at two points, each with its own metering unit or injector. P2EAD means the second one no longer delivers what it should. GM documents it for the 3.0 L Duramax LZ0, where its table calls it injector 2 performance with low consumption: the control unit compares the pressure drop expected while the second injector doses with what it measures and builds a correction factor; once the averaged factor passes the calibrated limit, proper delivery is no longer assured and the code sets as type A, MIL after one trip. Unit 1 has P20FE. GM bulletin 23-NA-193 lists P2EAD among codes on 2023 Silverado and Sierra 1500 caused by software and cured by an engine module update. Otherwise a crusted or partly blocked injector or a kinked line is usual.
- What you may notice
- Check engine lamp on
- DEF warning and, if not repaired, speed limitation
- Higher NOx emissions
- Likely causes
- LikelySecond DEF injector crusted or partly blocked by urea crystals
- PossibleKinked, frozen or blocked line to the second injector
- PossibleEngine control software needing an update (GM LZ0 2023)
- RareWeak DEF pump or pressure sensor deviation
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.