P045BEGR B Control Circuit Range/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
- 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. P045B means the drive circuit of valve B is electrically valid, but the feedback – current, voltage or position response – does not match the command. No manufacturer document available to us uses this code; the description follows the valve A counterpart P0404 and CARB, which requires output functions to be checked where feasible. Typical is a coked, stiff valve.
- What you may notice
- Check engine light on
- Low-pressure EGR switched off, possibly higher NOx
- Usually no change in driving
- Likely causes
- LikelyValve B coked or stiff
- PossibleContact resistance in connector or wiring
- PossibleActuator motor worn internally
- RareEngine module software or calibration
- 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 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.