Powertrain, generic · Fuel and air metering (injector circuit)

P02E1 Diesel Intake Air Flow A Control Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The diesel intake air flow valve A is the throttle flap ahead of the intake manifold of a diesel engine: it creates the vacuum needed for high EGR rates, lowers airflow to heat the particulate filter and catalyst during regeneration and closes at switch-off against run-on shaking. A spring holds it open when unpowered; an electric motor positions it, with a position sensor reporting back. P02E1 means the valve does not follow its target position – GM's diesels set it when target and actual position differ by more than 10 % for about 1.2 s with a steady target, after two trips. Usually soot from EGR and oil from crankcase ventilation make it stiff, or the gear or motor is worn. On a fault the valve is switched off and the spring opens it: driving is usually little affected, but EGR control is restricted and filter regeneration may be blocked.

Likely causes

Coking from EGR soot and crankcase oil on flap and shaft
Valve gear or motor worn
Position sensor inaccurate
Icing in cold weather

Symptoms

  • Check engine light on
  • Often no noticeable change
  • Filter regeneration does not run, soot load rises
  • Shaking at switch-off

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–600
Time0.5–2.5 h

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

Parts involved

diesel intake throttle valvethrottle valve motoractuator wiring

Related codes

P02E7P02E4P02E5P02EBP2391

References: law.cornell.edu, gsi.ext.gm.com, ms-motorservice.com.