Code
C116006
BYD
C — Chassis
Faulty status mode of left and right motors
Views:
UK: 3
EN: 9
RU: 6
AI status
Completed
Completed
100%
Causes
- Communication error between motor controllers (CAN/LV-CAN faults).
- Faulty motor controller/inverter hardware or firmware bug.
- Wiring/connectors damaged, corroded or loose between controllers and vehicle harness.
- Incorrect configuration or calibration in vehicle control module (VCM/BCU).
- Low/high DC link or motor supply voltage causing controllers to enter safe mode.
- Intermittent sensor or encoder faults that change reported motor state.
Symptoms
- Warning lamp(s) for EV drive/motor or general malfunction lamp illuminated.
- Reduced or disabled drive power, limp-home mode, or degraded performance.
- Drive torque asymmetry, vibration or unusual motor noise during acceleration.
- Fault codes logged for motor controllers, inverters, or CAN communication.
- Vehicle may not drive or may disable one motor if in multi-motor configuration.
What to check
- Read all stored and pending DTCs from all control units (motor controllers, BCU/VCU, ABS/ESC).
- Check freeze frame and live data for both left and right motor status/mode values.
- Inspect high-voltage interlocks, pre-charge, and DC link voltage for stability.
- Visually inspect motor controller connectors, harnesses and ground points for damage/corrosion.
- Check CAN bus integrity: termination, continuity, resistance (~60 ohm total), and differential signal.
- Confirm software/firmware versions and calibration settings for both motor controllers.
Signal parameters
- Left motor controller mode/status bits (e.g., Off/Ready/Run/Fault)
- Right motor controller mode/status bits
- CAN message IDs and payload showing mode flags for each motor
- DC link (HV) voltage and current
- Motor phase voltages and inverter output readings
- Rotor position/encoder/resolver feedback
Diagnostic algorithm
- Retrieve complete DTC list and note occurrences, timestamps and freeze frame data from all related modules.
- Clear codes and attempt to reproduce the fault while monitoring left/right motor status and CAN messages live.
- Compare real-time mode/status values for left and right controllers; note which unit reports unexpected mode.
- Inspect and secure all connectors, grounds and junctions for left/right motor harnesses; repair any damage.
- Check CAN bus wiring: measure continuity, short to ground/power, and proper termination resistance. Repair faults.
- Verify HV battery DC link voltage and pre-charge behavior. Address any HV interlock or sag issues.
- Confirm firmware/software versions and calibration are consistent between motor controllers; update if required per manufacturer procedure.
- If a specific motor controller reports persistent incorrect mode after wiring and CAN verified, isolate by swapping controllers or modules if supported and observe behavior (only if workshop procedures allow).
- If hardware swap reproduces the issue on the other side, replace the suspected faulty motor controller/inverter per manufacturer instructions.
- After repair, clear codes and perform a full road/test bench verification to ensure the status modes remain consistent and no related codes return.
Likely causes
- Open/shorted CAN high or CAN low between left and right motor controllers.
- Faulty or reset motor controller (inverter) on left or right side.
- Poor connector pin contact at motor controller, junction block, or battery disconnect.
- Battery voltage sag, pre-charge circuit failure, or HV interlock tripped.
- Mismatch of software versions or calibration parameters between two motor controllers.
- Damaged rotor position sensor (resolver/encoder) causing controller to change mode.
Fault status
Status
Left/right motor controllers reporting inconsistent or invalid operating mode — check motor controller communication and hardware.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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