Powertrain, generic · Computer and auxiliary outputs

P06FE Cold Start Diesel Intake Air Flow Control Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

'Diesel intake air flow control' is the diesel's electric intake throttle with position sensor (P02E0 ff). During cold start many diesels close it partly: the extra load raises exhaust temperature so the catalysts light off sooner. CARB requires such cold start elements to be monitored, with their own codes separate from normal operation. P06FE means the throttle does not reach its target position while the cold start strategy is active – it is not the intake air heater. No manufacturer document available to us uses P06FE: GM's 2025 diesels run this check under P2957 (deviation above 16 % or 10 %, two trips), Ford's 2023 diesels under P02E4 in cold start mode. Cold start emissions rise; driveability usually stays normal.

Likely causes

Intake throttle coked with soot and oil (EGR, crankcase ventilation)
Throttle motor or gear stiff, position sensor faulty
Ice or condensate in the intake in frost
Contact resistance in connector or wiring, low voltage

Symptoms

  • Check engine light, usually after two trips
  • Hardly any change in driveability
  • Possibly more smoke or smell while warming up
  • Further throttle codes (P02E1/P02E4/P02E5) possible

Repair estimate

DifficultyMediumDIY possible
Parts and labour€80–700
Time0.5–2.5 h

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

Parts involved

diesel intake throttlethrottle position sensorengine control module

Related codes

P02E1P02E4P02E5P050AP05ECP056E

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