Powertrain, generic (extended)

P2D3C Cold Start Hybrid/EV Drive Motor Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

In a hybrid the electric drive motor can be part of the strategy that cuts emissions after a cold start, and P2D3C says it did not perform as that strategy required. CARB demands separate diagnostics for elements of the cold start strategy that are also monitored in normal operation, so a motor fault found during warm-up is kept apart from the general P0A90. No manufacturer documents P2D3C publicly. GM patent US8838316B2 explains the role: the motor drives the car and spins the unfuelled engine to roughly 1,000 to 1,800 rpm, ideally 1,200 to 1,400 rpm, so it can light off the catalyst with retarded spark; if the motor cannot cover the driver's request within its limits, the strategy is abandoned. A motor that falls short therefore costs catalyst heating and raises cold start emissions. Look for further motor, inverter or battery codes.

Likely causes

Motor output derated by temperature or another motor fault
Cold or weak traction battery limiting the power available to the motor
Calibration of the cold start strategy in the hybrid controller (software update)
Resolver or motor position sensor fault affecting torque delivery

Symptoms

  • Malfunction indicator lamp on
  • Engine starts earlier or runs rougher after a cold start than usual
  • Often no noticeable change in driving

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,000
Time0.5–6 h

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

Parts involved

drive motor ainverter

Related codes

P2D3DP2D3EP0A90P2D28

References: law.cornell.edu, patents.google.com.