Code
P0AE6
Generic
P — Powertrain
Hybrid/EV Battery Precharge Contactor A Control Circuit Low
Views:
UK: 17
EN: 23
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or high-resistance wiring in the contactor control circuit
- Failed precharge contactor (coil open or shorted)
- Faulty driver/IGBT/MOSFET inside inverter/ECU that switches the contactor
- Weak or missing ground or supply voltage to the contactor driver
- Connector corrosion, damage, or poor pin contact
- Blown fuse or tripped protection device in precharge/control supply
Symptoms
- Hybrid/EV system fails to enter ready/drive mode or extended cranking/initialization
- HV battery precharge takes longer than normal or does not complete
- Illuminated hybrid/EV system warning lamp or reduced power mode
- DTC P0AE6 stored alongside other HV contactor or precharge DTCs
- Possible audible clicking from contactor attempts or no click at all
What to check
- Read and record freeze frame and related codes with a capable scan tool.
- Verify ignition/ready state and attempt precharge while monitoring live data (contactor command, coil feedback).
- Visually inspect connectors, wiring harness, and contactor A for damage, heat, or corrosion.
- Check fuses and service disconnects for the precharge/control circuits.
- Measure supply voltage and ground integrity at the contactor connector with connector in place.
- Measure coil resistance of the precharge contactor (with HV system safe and isolated per manufacturer procedures).
Signal parameters
- Command voltage: typically near 0 V (off) and near system accessory/battery voltage when commanded on (varies by design).
- Expected coil resistance: typically in the low ohm range (example 1–30 ohms) — consult vehicle specification.
- Expected coil current when energized: depends on coil resistance and supply voltage (often hundreds of mA to a few amps).
- PWM control: some systems use PWM; frequency commonly in the 100 Hz–several kHz range and variable duty cycle.
- Fault condition: measured voltage or current below expected when ECU requests contactor closure (low-voltage/low-current).
Diagnostic algorithm
- Safety: Disable HV system per manufacturer procedure before any high-voltage access. Use appropriate PPE.
- Connect a capable scan tool. Read and save all DTCs and freeze-frame data. Note related HV contactor or pack codes.
- Attempt to command precharge contactor A while monitoring live data: confirm ECU sends the command signal and note any feedback values.
- Inspect wiring and connectors from ECU/driver to precharge contactor A for corrosion, disconnection, melted insulation, or damage.
- With HV system isolated and safe, measure contactor coil resistance at the contactor terminals and compare to spec. Replace contactor if open or out-of-spec.
- Reconnect and, with proper HV safety measures, measure supply voltage and ground at the contactor connector while commanding the contactor. Verify expected voltage/current is present.
- If command voltage is present at the connector but contactor does not energize, suspect a failed contactor or internal mechanical fault; replace contactor.
- If command voltage is not present at the contactor connector but ECU shows it commanded, trace wiring back to the driver/module and test for continuity, short-to-ground, or short-to-voltage.
- If wiring is good, suspect the driver stage inside the inverter/ECU. Check fuses, relays, and any intermediate driver modules. Repair or replace the faulty module as indicated by tests.
- After repairs, clear codes, cycle the HV system, and perform functional tests and a road test to confirm the fault does not return. Re-scan for stored or pending codes.
Likely causes
- Damaged connector or wiring (physical chafe/heat/corrosion) between ECU/driver and precharge contactor A
- Failed precharge contactor coil (open or increased resistance)
- Faulty driver transistor/module in the inverter or control unit
- Low supply voltage to the driver due to a blown fuse or poor ground
Fault status
Status
Control circuit low for Hybrid/EV battery precharge contactor A — ECU commanded the precharge contactor but detected a lower-than-expected voltage/current on the control circuit.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P0AE6
LAND ROVER
P — Powertrain
Control of the hybrid battery pre-load contactor - low circuit
Views:
UK: 6
EN: 15
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or high-resistance wiring in the contactor control circuit
- Failed precharge contactor (coil open or shorted)
- Faulty driver/IGBT/MOSFET inside inverter/ECU that switches the contactor
- Weak or missing ground or supply voltage to the contactor driver
- Connector corrosion, damage, or poor pin contact
- Blown fuse or tripped protection device in precharge/control supply
Symptoms
- Hybrid/EV system fails to enter ready/drive mode or extended cranking/initialization
- HV battery precharge takes longer than normal or does not complete
- Illuminated hybrid/EV system warning lamp or reduced power mode
- DTC P0AE6 stored alongside other HV contactor or precharge DTCs
- Possible audible clicking from contactor attempts or no click at all
What to check
- Read and record freeze frame and related codes with a capable scan tool.
- Verify ignition/ready state and attempt precharge while monitoring live data (contactor command, coil feedback).
- Visually inspect connectors, wiring harness, and contactor A for damage, heat, or corrosion.
- Check fuses and service disconnects for the precharge/control circuits.
- Measure supply voltage and ground integrity at the contactor connector with connector in place.
- Measure coil resistance of the precharge contactor (with HV system safe and isolated per manufacturer procedures).
Signal parameters
- Command voltage: typically near 0 V (off) and near system accessory/battery voltage when commanded on (varies by design).
- Expected coil resistance: typically in the low ohm range (example 1–30 ohms) — consult vehicle specification.
- Expected coil current when energized: depends on coil resistance and supply voltage (often hundreds of mA to a few amps).
- PWM control: some systems use PWM; frequency commonly in the 100 Hz–several kHz range and variable duty cycle.
- Fault condition: measured voltage or current below expected when ECU requests contactor closure (low-voltage/low-current).
Diagnostic algorithm
- Safety: Disable HV system per manufacturer procedure before any high-voltage access. Use appropriate PPE.
- Connect a capable scan tool. Read and save all DTCs and freeze-frame data. Note related HV contactor or pack codes.
- Attempt to command precharge contactor A while monitoring live data: confirm ECU sends the command signal and note any feedback values.
- Inspect wiring and connectors from ECU/driver to precharge contactor A for corrosion, disconnection, melted insulation, or damage.
- With HV system isolated and safe, measure contactor coil resistance at the contactor terminals and compare to spec. Replace contactor if open or out-of-spec.
- Reconnect and, with proper HV safety measures, measure supply voltage and ground at the contactor connector while commanding the contactor. Verify expected voltage/current is present.
- If command voltage is present at the connector but contactor does not energize, suspect a failed contactor or internal mechanical fault; replace contactor.
- If command voltage is not present at the contactor connector but ECU shows it commanded, trace wiring back to the driver/module and test for continuity, short-to-ground, or short-to-voltage.
- If wiring is good, suspect the driver stage inside the inverter/ECU. Check fuses, relays, and any intermediate driver modules. Repair or replace the faulty module as indicated by tests.
- After repairs, clear codes, cycle the HV system, and perform functional tests and a road test to confirm the fault does not return. Re-scan for stored or pending codes.
Likely causes
- Damaged connector or wiring (physical chafe/heat/corrosion) between ECU/driver and precharge contactor A
- Failed precharge contactor coil (open or increased resistance)
- Faulty driver transistor/module in the inverter or control unit
- Low supply voltage to the driver due to a blown fuse or poor ground
Fault status
Status
Control circuit low for Hybrid/EV battery precharge contactor A — ECU commanded the precharge contactor but detected a lower-than-expected voltage/current on the control circuit.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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0
Send to email
