B13FF

Code

LAND ROVER B — Body

Left rear - Sensor of

Brand: LAND ROVER

Type: B — Body

Views: UK: 18 EN: 45 RU: 18

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Page language: EN

Causes

Sensor unit electrical failure
Broken, chafed or corroded wiring or connector to left rear sensor
Poor or missing ground or supply voltage to sensor
Water ingress, dirt or physical damage to the sensor
Faulty control module or bus communication error (CAN/FlexRay/LIN)
Incorrect software/configuration or recent module replacement without programming

Symptoms

Warning lamp or message on instrument cluster related to affected system (e.g., parking aid, ABS, suspension, airbag/seat)
Left rear sensor does not operate or returns no/erratic readings
System behaves as if left rear sensor absent (reduced capability, degraded mode)
Intermittent faults triggered by moisture, vibration or temperature changes

What to check

Read all stored manufacturer-specific and standard DTCs with a capable scan tool; record freeze frame/live data
Identify which system and physical sensor the code refers to (parking, ABS, seat, etc.) using the vehicle service manual
Perform a visual inspection of the left rear sensor and surrounding area for damage, contamination, or water ingress
Inspect connector: check for corrosion, bent pins, pushed out seals, and proper locking
Trace and inspect wiring harness for rubbing, pinches, or previous repair splice points
Check for presence of power and ground at the sensor connector with ignition on

Signal parameters

Typical sensor supply: 9–12 V (vehicle battery feed) or switched 5 V reference depending on sensor type
Signal output: 0–5 V analog or digital/binary for simple on/off sensors
Wheel-speed-type sensors may produce AC voltage or digital pulse train; expected frequency varies with wheel speed
Resistance checks: many passive sensors show finite resistance; an open/infinite or short to ground indicates fault
Diagnostics may show absent CAN messages for that sensor’s node when communication fault exists

Diagnostic algorithm

Connect a manufacturer-capable scan tool, read and record B13FF and any related codes and live data. Note any other modules reporting communication errors.
Confirm which left rear sensor and system is implicated using service literature. Refer to wiring, pinouts and connector locations.
Visually inspect sensor, mounting and connector. Clean and re-seat connector; check for water, corrosion or physical damage.
With ignition on, check reference supply voltage and ground at the sensor connector. Compare to expected values in service data.
Measure signal output while actuating the sensor or operating the vehicle (if applicable). For wheel-speed or active sensors, verify pulses or voltage proportional to rotation.
Perform a continuity check from the sensor connector back to the controlling module for power, ground and signal circuits; repair any open/shorted wiring.
If wiring and power/ground are good but sensor signal is invalid, swap with a known-good identical sensor (if available) or bench-test/replace sensor per service procedures.
If replacement sensor does not clear the issue, check the control module and vehicle bus communications; perform module reprogramming or software updates if recommended by TSBs.
Clear codes and confirm repair by road test and verifying no reoccurrence and correct live data values.

Likely causes

Damaged or contaminated left rear sensor
Corroded or loose connector at left rear sensor
Open or short in sensor supply/ground or signal wiring
Failed sensor control module or loss of CAN communication

Fault status

⚠️ Status

Left rear sensor offline or reporting invalid data (manufacturer code B13FF). Sensor circuit requires inspection — no final diagnosis until tested.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours

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Repair manuals

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B13FF — Left rear - Sensor of