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

P02E7 Diesel Intake Air Flow A Position Sensor Circuit Range/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. P02E7 is the position plausibility fault. GM's 6.6 litre LML implements it through position control: target and actual position differ by more than ±10 % for 10 s, two trips; newer GM diesels report the same as P02E1. It can mean a sensor reporting a wrong position as well as a stiff valve. 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

Valve stiff or coked
Position sensor drifting
Contact resistance in the sensor connector
Gear play

Symptoms

  • Check engine light on
  • Often no noticeable change
  • Filter regeneration does not run, soot load rises

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 position sensordiesel intake throttle valvesensor wiring

Related codes

P02E1P02E8P02E9P02FAP02EA

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