P0B6F

Code

LAND ROVER P — Powertrain

Hybrid / electric battery vehicle - Voltage - Direction K - Low circuit

Brand: LAND ROVER

Type: P — Powertrain

Views: UK: 13 EN: 19 RU: 14

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Page language: EN

Causes

Open or damaged wiring in the Direction K signal circuit
Poor, corroded or loose connector at the battery pack, sensor, or control module
Short to ground on the Direction K circuit
Blown fuse or poor power/ground supply to the sensor/BMS
Faulty Direction K sensor or voltage-sense module inside the battery pack
Faulty BMS/ECU input stage or internal failure in control module

Symptoms

Malfunction Indicator Lamp (MIL) or hybrid system warning lamp ON
Hybrid system limited performance or reduced power/regeneration
Active fault messages on dash relating to high-voltage battery or hybrid system
Loss of charging/discharging control for pack, or battery state readings incorrect
Possible vehicle limp mode or refusal to enter electric drive

What to check

Read and record all stored/frozen DTCs and freeze frame data with a capable scan tool
Confirm vehicle symptoms and whether fault is current or historic
Visually inspect wiring and connectors on the high-voltage battery pack, sensor connectors, and BMS/ECU harness for damage, corrosion, or contamination
Check fuses and relays for the battery sensor/BMS circuits
With appropriate safety precautions, measure voltage at the Direction K signal terminal at the sensor and at the control module connector and compare (use HV-rated tools where required)
Perform continuity and resistance checks between sensor and module (power off, per service manual)

Signal parameters

Direction K signal should be present and follow expected reference (should not be persistently near 0 V or shorted to ground)
Expected signal range: signal should move within the BMS expected range (refer to manufacturer service data for exact voltages)
Compare voltage at sensor connector vs. BMS input; they should match within small tolerance
Watch live-data while keying ON and during pack state changes — signal should change accordingly
Observe battery pack voltage and isolation monitoring values while testing (HV safety required)

Diagnostic algorithm

Retrieve all hybrid/high-voltage DTCs and live data; note freeze frame and occurrence conditions.
Verify fault is present: cycle ignition and attempt to recreate fault condition; note any accompanying messages or events.
Perform a careful visual inspection of connectors, harness routing, and protective conduits for the Direction K circuit at the battery pack, sensor, and BMS/ECU. Look for corrosion, water ingress, abrasions, pin backing-out or bent terminals.
Check related fuses/relays and grounds. Repair or replace as required.
With vehicle off and proper HV isolation procedures followed, perform continuity and insulation resistance checks on the Direction K wiring between the sensor and the control module. Repair any opens or high-resistance joints.
If continuity is good, with qualified personnel and correct HV-rated meter/tools observe the Direction K signal voltage at the sensor connector and at the BMS input with the system powered (follow manufacturer safety procedure). Compare to expected values from service data.
If signal is low at both ends, suspect upstream sensor/power supply or pack voltage issue. If low at module but correct at sensor, suspect module input or harness to module.
Repair or replace damaged wiring, connectors, sensors, or control modules as indicated by testing. Ensure proper sealing and protective routing of harness.
After repairs, clear codes, perform calibrations or relearns required by manufacturer, and test drive to confirm fault does not return.
Safety note: high-voltage hybrid/electric battery work must only be done by trained, qualified technicians using appropriate PPE and procedures.

Likely causes

Damaged harness or chafed insulation near battery pack
Corroded connector at the battery module or pack junction
Sensor/module failed from water or mechanical damage
High-resistance connection due to contamination or bent terminal

Fault status

⚠️ Status

BMS detected low-voltage (low signal) condition on the Hybrid/Electric Battery Direction K circuit. Signal is below expected range or appears shorted/low.

🔴 Repair difficulty: Hard

⏱️ Diagnostic time: 2.0-6.0 hours

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P0B6F — Hybrid / electric battery vehicle - Voltage - Direction K - Low circuit