2023 Kia EV6 GT

Kia EV6 GT P0BD2 Rear Motor Torque Fault — Resolver Recalibration Required After Drive Unit Swap

P0BD2 C1AC200 Published 2025-01-09 Updated 2025-01-09
Kia EV6 GT P0BD2 torque fault resolver recalibration drive unit E-GMP

2023 Kia EV6 GT presented with P0BD2 rear motor torque fault and significant power reduction immediately after a rear drive unit replacement at a Kia dealer. Resolver calibration not performed after drive unit installation — newly installed unit running with incorrect rotor position reference.

← Back to Case Library
The Problem
2023 Kia EV6 GT (28,700 miles) brought in after a rear drive unit replacement at a Kia dealer for an unrelated internal failure. Post-replacement, vehicle had significant power reduction and P0BD2. Dealer could not resolve — referred to independent specialist.
Diagnostic Procedure
  1. 1. Confirm P0BD2 rear motor. Fault appeared immediately after drive unit replacement.
  2. 2. Check resolver signal quality on new drive unit. Signals clean — hardware is good.
  3. 3. Check resolver calibration offset stored in BMS/MCU. Resolver calibration offset reads 0x0000 — factory default, not calibrated for this specific installed unit.
  4. 4. Each drive unit has a unique resolver calibration offset due to manufacturing tolerances in resolver mounting position. This offset must be measured and programmed after installation via GDS2 resolver calibration procedure.
  5. 5. Perform resolver zero-point calibration via GDS2: vehicle on level surface, drive wheels lifted, calibration sequence run with motor at specific speed ramp. Calibration takes approximately 12 minutes.
  6. 6. Calibration complete. New offset stored in MCU.
  7. 7. Lower vehicle. Drive test: full rear motor torque available. 0-60 mph performance restored. P0BD2 does not return.
Resolution & Root Cause
Resolver calibration performed after drive unit replacement. Torque fault resolved, full performance restored.
💡 Key Lesson
Kia EV6 GT (and all E-GMP platform vehicles) require a resolver zero-point calibration procedure via GDS2 after any drive unit replacement. Skipping this step leaves the motor controller using a default zero reference, causing torque errors and P0BD2. This is a known missed step — the resolver calibration is not prominently called out in all service procedure flowcharts.
About This Case

This case was solved remotely by an HVDesk specialist with 15+ years of hands-on experience across major EV platforms including Tesla, Hyundai/Kia, Volkswagen ID series, BMW i-series, and Ford EVs. The procedure was provided as structured remote support to an independent auto repair shop.