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

P02E3 Diesel Intake Air Flow A Control Circuit High

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. P02E3 means the drive circuit is shorted to battery voltage: GM's LML detects 0.5 Ω or less for 3 s, two trips; Ford's diesels within 0.2 s. The driver switches off. 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

Wire shorted to a supply wire in the harness
Corroded connector bridging pins
Valve motor faulty internally
Engine module

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€50–500
Time0.5–2 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

P02E2P02E0P02EBP2393

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