Powertrain, generic · Auxiliary emission controls

P045E EGR B Control Stuck Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

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. P045E means valve B does not close: its actual position stays above the target despite the close command. On FCA's 2.2-litre diesel in the Jeep Wrangler, deposits in the low-pressure valve cause it; the bulletin prescribes a cleaning routine of nine ignition cycles that moves the valve repeatedly. Another FCA bulletin shows P045E following a position sensor fault (P0407/P0408). Too much EGR causes misfire, lack of power and smoke.

Likely causes

Soot or condensate deposits in the low-pressure valve
Valve position sensor fault as the trigger
Actuator gear or return spring faulty
Foreign matter or filter debris in the low-pressure circuit

Symptoms

  • Check engine light on
  • Lack of power, rough running, misfire
  • Possibly black smoke

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,200
Time0.5–4 h

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

Parts involved

egr valve blow pressure egr valveegr wiringengine control module

Related codes

P045FP042EP0402P0407P044CP049E

References: static.nhtsa.gov, static.nhtsa.gov, gsi.ext.gm.com, law.cornell.edu.