P045FEGR B Control Stuck Closed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. EGR B is a second EGR valve next to valve A – on diesels with two EGR circuits the low-pressure valve, which takes exhaust after the particulate filter and feeds it in before the turbo compressor. GM's diesels of 2016–18 and FCA's 2.2-litre diesel in the Jeep Wrangler use it. P045F means valve B does not open: its actual position stays below the target despite the open command. GM lists the code among those that switch off low-pressure EGR control; Ford's comparable valve A check (P042F) compares the position with a calculated lower limit. Too little EGR raises NOx while driving stays normal. Icing or condensate can block a low-pressure valve – FCA runs its cleaning routine only above 0 °C.
- What you may notice
- Check engine light on
- Low-pressure EGR switched off, possibly higher NOx
- Usually no change in driving
- Likely causes
- LikelyLow-pressure valve coked or stuck
- PossibleActuator motor or gear faulty
- RareIcing or condensate in the low-pressure circuit
- RarePosition sensor reports a wrong position
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.