Code
C1D10
LAND ROVER
C — Chassis
Field effect transistor circuit overheating overheating
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UK: 4
EN: 8
RU: 1
AI status
Completed
Completed
100%
Causes
- Insufficient cooling or blocked airflow to inverter/driver module
- Failed or degraded FET(s) (MOSFET/IGBT) or gate drivers
- Poor electrical connection (high resistance) at power or ground terminals
- Short circuit or excessive load current through the FETs
- Faulty temperature sensor or incorrect temperature reporting
- Damaged PCB (burnt traces, solder joints) or corrosion at connectors
Symptoms
- Malfunction indicator lamp or specific alarm illuminated
- Loss of function related to the module (reduced torque, limp mode, actuator non-operation)
- Unusual heat from the inverter/driver housing
- Burnt smell or visible heat damage on module or connectors
- Intermittent operation that may correlate with temperature or load
What to check
- Read freeze frame and live data from the affected control module (module temperature, FET temperature, motor current, duty cycle)
- Scan for related DTCs in other modules (HV battery, motor controller, cooling system)
- Visually inspect inverter/driver housing, connectors and wiring for heat damage, corrosion or discoloration
- Confirm inverter cooling system operation: fan(s), pump, coolant level and thermostat, airflow paths
- With vehicle safe and HV isolated, check for loose or high-resistance power/ground connections at the module
- Check for continuity and insulation resistance of high-voltage cables (use appropriate HV equipment and PPE)
Signal parameters
- FET/junction temperature: compare to manufacturer threshold (typical trip ~120–150°C junction — check Land Rover spec)
- Module/heatsink temperature (°C) from diagnostics
- Motor/inverter output current (A) and peak current spikes
- Gate drive voltages (Vgs) — expected gate drive level per spec (typically 10–12 V for many MOSFETs)
- PWM frequency and duty cycle from inverter outputs (kHz, % duty)
- Supply voltages: high-voltage bus (V), 12V supply to gate drivers and control electronics (V)
Diagnostic algorithm
- Safety first: follow Land Rover high-voltage safety procedures. Disable HV system, wear PPE and discharge HV capacitors before any physical work.
- Connect a diagnostic tool and read all related DTCs and freeze-frame data. Record module temperatures, currents and duty cycles at fault occurrence.
- Perform a visual inspection of the inverter/driver module, connectors, wiring looms and cooling components for melted insulation, burnt solder joints or corrosion.
- Verify cooling system operation: run vehicle/stand tests to confirm fan(s)/pump work, inspect coolant flow and temperature rise under load. Repair any cooling faults.
- With HV isolated, check connector pin retention and cleanliness. Remove and inspect for signs of arcing, pitting or overheating. Clean or replace connectors as required.
- Measure resistance across power FETs and between phases (consult workshop manual). Look for shorted FETs (low resistance paths) or open gate drivers.
- Using controlled bench or in-vehicle tests (per manufacturer procedure), monitor gate drive signals, Vgs, drain-source voltage and switching waveforms with an oscilloscope while reproducing load conditions where safe and allowed.
- If suspect FET(s) or gate driver components, remove module (or have module bench-tested by a qualified HV electronics shop) for detailed component-level inspection and replacement.
- Check and test any related temperature sensors and compare sensor readings to actual measured housing temperatures. Replace sensor if out of spec.
- After repairs, clear codes and perform a monitored road/bench test to verify the fault does not return. Re-check for proper cooling, temperatures and current draw under load.
Likely causes
- Blocked/failed inverter cooling (pump, fan, coolant line)
- High-resistance power connection or corroded connector at the inverter/module
- Failed power FET(s) or degraded gate driver components
- Shorted motor winding or external overload causing excessive current
Fault status
Status
FET circuit overtemperature detected – field transistor overheating. Check cooling, connections, and power electronics.
Repair difficulty: Hard
Diagnostic time: 2.0 - 6.0 hours
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