P0AE6

Code

LAND ROVER P — Powertrain

Control of the hybrid battery pre-load contactor - low circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 12 EN: 35 RU: 23

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Page language: EN

Causes

Open or high‑resistance wiring between control module and pre‑load contactor coil (intermittent or permanent).
Corroded, loose or damaged connector at the contactor or control module.
Faulty pre‑load (precharge) contactor coil (open/shorted or internal fault).
Blown 12V fuse(s) or failed relay providing coil supply.
Faulty control module (ECM/HEV control module) output driver.
Low 12V battery voltage or poor 12V ground affecting coil supply.

Symptoms

Hybrid system fails to enter ready/drive mode or shows reduced functionality.
HV system warnings or hybrid system fault indicator on the dash.
No audible or mechanical click from pre‑load contactor when system attempts precharge.
Stored or intermittent DTC P0AE6 (and possibly other HV contactor codes).
Vehicle may default to limp-home or refuse to start EV operation.

What to check

Check for other stored hybrid/high‑voltage related DTCs and note freeze frame data.
Verify 12V battery condition and charge; ensure good battery terminal connections.
Visually inspect wiring harness and connectors between hybrid control module and pre‑load contactor for corrosion, damage, or loose pins.
Check relevant 12V fuses and relays that supply the contactor coil.
Use a diagnostic scan tool to command the pre‑load contactor ON/OFF and observe operation and fault response.
Measure voltage at the contactor coil connector while commanding ON (observe safety rules — HV isolation as required).

Signal parameters

Control command: diagnostic tool should request contactor ON; control line voltage at coil supply should rise to near battery voltage (approx. vehicle 12V nominal) when commanded — consult service manual for exact expected voltage.
Coil resistance: measured between coil terminals with power removed; typical coil resistance ranges vary by design — refer to Land Rover service data for the exact ohm value.
Current draw: when energized, coil current should be within manufacturer spec (often under 10 A for 12V coils) — confirm with service data.
No‑command state: control output may be open, high‑impedance or held at supply voltage depending on driver design; consult wiring diagram.

Diagnostic algorithm

Safety first: follow manufacturer HV safety procedures. Do not perform high‑voltage system tests unless qualified and using correct PPE.
Retrieve all related DTCs and freeze frame/capture data with a diagnostic scanner. Note time of fault and conditions.
Check 12V battery voltage and condition. Replace or recharge if low. Clean and tighten battery terminals.
Inspect fuses and relays for the contactor coil circuit; replace any blown fuses and retest.
Visually inspect the contactor, harness and connectors for damage, corrosion or signs of overheating. Repair as necessary.
With vehicle in a safe, de‑energized state (follow manual), measure coil resistance across the pre‑load contactor coil. Compare to specification. An open or shorted coil requires contactor replacement.
Re‑energize vehicle to accessory or diagnostic mode. Use a scan tool to command the pre‑load contactor ON while measuring voltage at the contactor coil supply terminal. If commanding ON does not produce the expected supply voltage, trace back to fuse/relay and wiring.
If supply voltage is present but the coil does not energize (and coil resistance OK), check control module driver signal (voltage or ground switch) and related wiring continuity. Perform wiggle tests to try to reproduce fault.
If wiring and contactor check good but control signal is absent or incorrect, consider module driver fault. Confirm with scope or manufacturer diagnostics before replacing module.
After repairs, clear DTCs and perform functional/road tests and multiple key cycles to confirm fault does not return. Document repair and test results.

Likely causes

Loose connector or wiring fault at the pre‑load contactor.
Open coil in the pre‑load contactor (no coil continuity).
Blown 12V supply fuse or failed relay feeding the contactor coil.
Faulty driver in the hybrid control module (less likely than wiring/contactor).

Fault status

⚠️ Status

Control circuit low detected for hybrid battery pre‑load contactor. Module attempted to energize the contactor but sensed an abnormally low voltage or signal on the control/coil circuit.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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P0AE6 — Control of the hybrid battery pre-load contactor - low circuit