B2090

Code

LAND ROVER B — Body

Failure in the input data line without

Brand: LAND ROVER

Type: B — Body

Views: UK: 21 EN: 27 RU: 22

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Page language: EN

Causes

Open or short in the input data/communication wiring (to ground or battery)
Corroded, loose or damaged connector or pin at module or sensor
Faulty sensor or input device driving the data line
Faulty control module (intermittent or failed interface)
Loss of bus termination or incorrect wiring after previous repairs
Software/firmware issue or incorrect module programming

Symptoms

One or more systems controlled by the module may operate intermittently or not at all
Communication faults reported on a diagnostic tool (lost messages)
Warning or malfunction indicator lights in the dash
Erratic sensor readings or frozen values in live data
No obvious mechanical fault with the related component

What to check

Read all stored and pending codes from all modules; note freeze frame and related U-codes
Use a scan tool to monitor live data from the suspected sensor/module and communication status
Visually inspect connectors, pins and wiring for corrosion, damage and proper seating
Wiggle harnesses/connectors while monitoring the live data to reproduce the fault
Check supply voltage and ground at the module and sensor (battery voltage present and stable)
Measure bus termination resistance for CAN (approx. 60 Ω between CAN H and CAN L with ignition off)

Signal parameters

CAN bus typical idle (recessive): CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V; dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
Total CAN bus termination: ~60 Ω between CAN_H and CAN_L (two 120 Ω terminators in parallel)
LIN bus idle (recessive): near battery voltage through pull-up; dominant low ≈ 0 V
Signal integrity: expect clean square/differential waveform on scope; excessive noise, missing edges or clipped levels indicate problem
Supply and ground at module: stable battery voltage (within ~0.5 V) with ignition on and no excessive voltage drop

Diagnostic algorithm

Record full DTC list and freeze frame; do not erase codes yet.
Attempt to reproduce the fault while monitoring live data for the affected input and communication status.
Visually inspect connectors, pins and wiring for damage, corrosion or loose terminals; repair as needed.
Verify power and ground circuits to the module and sensor(s). Repair poor power/ground before further testing.
Check bus termination resistance and continuity of data lines to other nodes; repair shorted or open conductors.
Backprobe the data line and observe voltages with a DMM; if intermittent or out-of-range, use an oscilloscope to inspect waveform for noise or missing frames.
Disconnect suspect sensor or node and see if the fault clears or other modules report loss of communication to isolate the faulty node.
If wiring and connectors check good, update module software to latest calibration and re-test.
If all tests point to the module, consider replacement or repair of the control module per manufacturer procedures.
After repair, clear codes and perform functional test and a road test to confirm the fault does not return.

Likely causes

Damaged harness or chafed insulation on the data/bus wire
Poor connector contact or moisture intrusion at a connector
Sensor with internal failure or intermittent output
Module with failed transceiver or internal I/O
Missing or faulty CAN/LIN termination resistor or short between bus lines

Fault status

⚠️ Status

Input data/communication line failure detected by module (invalid or missing data on input line).

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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B2090 — Failure in the input data line without