Powertrain, generic (extended)

P2D28 Cold Start Propulsion Torque Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2D28 concerns the torque side of a cold start strategy. To heat the catalyst, the engine control asks for a torque reserve: spark is retarded and airflow raised so the wheels still get the requested torque while extra heat goes into the exhaust. A GM patent describes this, with a heat estimate turned into a reserve request that enters the propulsion torque calculation. The code means the torque delivered or commanded in this phase strayed from what the strategy planned. CARB allows cold start heating to be judged by the last commanded reserve of torque over the first 30 s at idle. Stellantis lists P2D28 for the 2026 Dodge Charger with the 3.0 l Sixpack engine; bulletin 18-022-26 says it was set falsely through a non-robust monitor and is cured by PCM software. P032F is the general low torque code.

Likely causes

Engine control software with a monitor that sets the code without a real fault
Throttle, intake leak or airflow error, so retarded spark cannot be balanced by more air
Misfires or weak ignition while spark is heavily retarded
Implausible temperature or speed input to the torque model

Symptoms

  • Check engine light shortly after a cold start
  • Hesitant or uneven pull while the engine is still cold
  • Often no noticeable symptom when the cause is software

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–800
Time0.5–3 h

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

Parts involved

ecmengine

Related codes

P032FP050AP050BP050EP050D

References: static.nhtsa.gov, patents.google.com, law.cornell.edu.