P0AE5

Code

LAND ROVER P — Powertrain

Control of the hybrid battery contactor - range of the circuit / performance

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 18 EN: 50 RU: 23

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Page language: EN

Causes

Open, short to ground, or short to battery in contactor control wiring
High resistance in contactor coil circuit or connector corrosion
Failed high-voltage (HV) battery contactor/relay (coil or contacts)
Faulty control module or driver transistor (ECU/TCU/PCU)
Intermittent connector or pin damage at HV contactor or control module
HV battery pack internal fault or poor pack voltage/inrush behavior

Symptoms

Hybrid system warning lamp or master warning illuminated
Reduced or no high-voltage battery engagement; vehicle may refuse to start in EV/Hybrid mode
Inability to charge or discharge high-voltage battery
Intermittent loss of high-voltage contactor operation (system may enter limp mode)
Unusual clicking from the battery pack area or no click if expected
Stored or active DTCs related to HV system, contactors, or isolation faults

What to check

Read and record all hybrid-related DTCs and freeze frame data with a capable scan tool
Inspect HV contactor area and wiring for damage, melting, corrosion or water ingress
Verify all HV interlock/insulation checks and service plugs are correctly installed before any HV work
Check associated fuses, relays, and low-voltage supplies to the hybrid control module
Visually inspect connectors and backshells for bent pins or loose terminals
Attempt module-driven contactor activation with diagnostic tool (observer mode) while following HV safety procedures

Signal parameters

Contactor coil resistance (ohms) — compare to manufacturer spec
Contactor control voltage at module output (volts) during activation command
Voltage at the contactor coil input and return while commanded ON and OFF
Current draw of contactor coil during activation (amps)
CAN bus messages/response from hybrid control module when commanded to engage contactor
Battery pack HV voltage and transient behavior when contactor is commanded

Diagnostic algorithm

Retrieve all related codes and freeze frame data. Note time/date and conditions when the code set.
Do a complete visual inspection of HV contactor, harness, connectors, and nearby components for damage, heat, or contamination. Ensure vehicle is in a safe, de-energized state before touching HV components.
Verify the low-voltage power, ground, and fuses feeding the hybrid control module and contactor driver are present and within spec.
With appropriate HV safety procedures and tools, command the contactor ON/OFF from a diagnostic tool while monitoring contactor coil voltage and current. Confirm mechanical operation (click) and correct electrical values.
Measure contactor coil resistance (de-energized) and compare to spec. Check for open circuit or unusually high resistance.
Check for shorts to chassis ground or battery by measuring continuity between coil terminals and ground when de-energized.
Inspect and back-probe connector pins for intermittent faults while actuating contactor; wiggle test harness to reproduce the fault.
If contactor does not operate electrically but has correct control signal from the module, suspect contactor or supply/return wiring failure. If control signal is absent or abnormal, suspect module driver or internal fault.
Check for related HV battery pack faults or isolation faults that could prevent contactor closure; verify pack voltage and pack controller status.
Review technical service bulletins and software calibration for the hybrid control module; perform reprogramming if recommended.
Replace suspect wiring/connector or contactor assembly as required. After any repair, clear codes and perform functional tests and a road test to confirm repair.
If fault persists after replacing contactor and wiring, test or replace the hybrid control module per manufacturer diagnostic procedures.

Likely causes

Damaged harness between HV battery contactor and hybrid control module
Contactor coil open or degraded (excessive coil resistance)
Contactor coil circuit shorted to chassis ground or battery positive
Corroded or loose connector at contactor or module
Contactor sticking mechanically or contacts burned causing abnormal current draw
Faulty hybrid control module output driver

Fault status

⚠️ Status

Control of hybrid battery contactor — circuit range/performance detected. HV contactor control signal out of range or abnormal performance.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 2.0 - 5.0 hours

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P0AE5 — Control of the hybrid battery contactor - range of the circuit / performance