Code
C058F
Generic
C — Chassis
Regeneration Torque Performance
Views:
UK: 21
EN: 22
RU: 17
AI status
Completed
Completed
100%
Causes
- Motor/inverter fault or internal derating
- Battery or DC bus voltage out of allowable range or battery derating
- Faulty torque sensor, wheel speed sensor, or brake switch input
- Poor or corroded high-voltage or CAN wiring/connectors
- Software calibration error or control module fault
- Mechanical brake dragging or driveline binding limiting regen
Symptoms
- Reduced or no regenerative braking felt at pedal
- Warning light or message related to regenerative braking or hybrid system
- Gearbox or driveline limp behavior during coast or decel
- ECO/regen system disabled or reduced performance
- Possible abnormal charge/discharge behavior of HV battery during deceleration
What to check
- Scan for all stored and pending DTCs in hybrid, motor/inverter, ABS, and BMS modules
- Compare 'regen torque requested' vs 'regen torque actual' live data with scan tool
- Check HV battery voltage, current, state of charge (SOC) and BMS status/derates
- Inspect high-voltage connectors, fuses, contactors, and DC bus for continuity and corrosion
- Verify brake switch inputs and wheel speed sensors; check ABS for related faults
- Read inverter/motor fault history and motor temperature/inverter temperature values
Signal parameters
- Regen torque requested (Nm)
- Regen torque actual/feedback (Nm)
- Motor/inverter output current (A)
- DC bus voltage / HV battery pack voltage (V)
- Battery state-of-charge (SOC) (%)
- Motor temperature / Inverter temperature (°C)
Diagnostic algorithm
- Retrieve and record all relevant DTCs from hybrid, inverter, ABS, and BMS modules. Note freeze frame data.
- Clear codes and attempt to re-create the fault under controlled road test while logging: regen request, actual torque, motor current, DC bus voltage, SOC, brake switch, wheel speeds and module statuses.
- If actual torque is persistently lower than requested, check for battery or DC bus limitations: measure pack voltage, check BMS for derating conditions and verify HV contactors and fuses.
- Inspect inverter/motor module: review fault history, check inverter and motor temperatures, look for internal derates or error counters. Use manufacturer test procedures to exercise motor/inverter if available.
- Verify brake switch and wheel speed sensor operation and wiring; a false brake signal or ABS request can disable regen.
- Inspect all high-voltage and CAN wiring/connectors between BMS, inverter, hybrid control module and ABS for damage, corrosion or poor connections. Repair as necessary.
- If wiring and sensors check good, consider software/calibration updates or reflash of related controllers per service information.
- If fault persists, isolate components: swap known-good module (if available) or perform component bench tests (motor/inverter) per manufacturer's safe procedures.
- After repairs, clear codes and perform validation road test to ensure requested vs actual regen torque matches and no new fault codes return.
Likely causes
- Inverter/motor producing less current than commanded due to internal fault or protective limit
- Battery state-of-charge, voltage or temperature causing regenerative current limit
- Brake switch or ABS wheel speed sensor reporting unexpected status, cancelling regen
- CAN bus or module communication errors causing mismatch between request and measurement
Fault status
Status
Regeneration Torque Performance: Actual regenerative torque differs from requested. Regenerative braking may be reduced or disabled.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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