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

P02E5 Diesel Intake Air Flow A Control Stuck Closed

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
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. P02E5 means the valve stays more closed than commanded or does not return to its open rest position when unpowered – more critical than stuck open, because the engine lacks air. GM sets it at over 8 % more closed than commanded with more than 80 % duty for about 4 s, or after switch-off when the unpowered valve stays below 90 % open, with the warning light in the first trip. Result: loss of power, black smoke, in extreme cases stalling.

Likely causes

Coking or oil carbon holding the valve closed
Return spring broken
Gear blocked
Icing

Symptoms

  • Check engine light on at once
  • Severe loss of power, limp mode
  • Black smoke, poor starting or stalling

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

P02E4P02E1P2395P02EDP0299

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.