Powertrain, generic (extended)

P2D3D Cold Start Hybrid/EV Drive Motor Inverter Torque Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2D3D narrows the cold start check to the inverter: during the cold start strategy, the torque it produced through the drive motor did not match the torque the hybrid controller commanded. Precise torque matters in this phase because motor and engine share the work. In Toyota application WO2015092509A1 the engine idles with retarded ignition at roughly zero to 3 kW while the second motor supplies most of the drive torque; in GM patent US8838316B2 the motor must cut its torque at the moment the engine fires so the driver feels no jolt at the wheels. No manufacturer documents P2D3D publicly. CARB asks for cold start faults to be stored apart from ordinary ones, which is why P0A78 exists beside this code. Typical reasons are inverter current sensing, temperature derating or calibration; expect a MIL rather than a loss of drive.

Likely causes

Phase current sensing error in the inverter distorting the delivered torque
Torque derating because of very low or high power electronics temperature
Torque coordination of the cold start strategy in software

Symptoms

  • Malfunction indicator lamp on
  • Slight jerk when the engine fires after a cold start

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–3,500
Time0.5–6 h

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

Parts involved

inverterdrive motor a

Related codes

P2D3CP2D3EP0A78P2D28

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