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

P02E6 Diesel Intake Air Flow A Position Sensor Circuit

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. P02E6 is the general circuit fault of the position sensor, without telling low from high. GM and Ford use the split codes P02E8/P02E9 instead; no manufacturer using P02E6 was found, so the description follows CARB's input monitoring requirement and the documented siblings (GM 0.40/4.72 V, Ford 0.08/4.92 V). 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

Sensor connector or wiring
Sensor in the valve unit faulty
5 V reference disturbed

Symptoms

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

Repair estimate

DifficultyMediumDIY possible
Parts and labour€50–500
Time0.5–2 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

P02E7P02E8P02E9P02EAP0120

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