U043C

Code

LAND ROVER U — Network/User

Invalid data received from the suspension control module B

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 10 EN: 22 RU: 18

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty suspension control module B (internal failure)
Intermittent or failed CAN/LIN bus wiring or connector to suspension module B
Corroded or loose connector pins at the module or gateway
Low or missing power / ground to the suspension module
Software mismatch or corrupted module software/calibration
ECU/gateway bus termination or interference (high bus load, short, open, or noise)

Symptoms

Suspension warning lamp or message on the dash (e.g., 'suspension fault')
Loss of height control, altered or stuck ride height, or suspension in limp mode
Reduced chassis control or degraded ride quality
Intermittent or permanent error messages related to suspension
Related systems may report communication errors (e.g., other modules flagging invalid suspension data)

What to check

Read all stored and pending DTCs from all modules with a Land Rover–capable diagnostic tool; check freeze frame and occurrence counts
Check for related U-codes in gateway, ABS, instrument cluster or body modules
Visually inspect suspension module B connector for corrosion, bent pins, water, or debris
Verify module supply voltage and ground with key on (battery voltage present at module power pins)
Backprobe CAN high/low at the module and check for correct recessive/dominant voltages (~2.5V idle) and differential behavior
Check CAN/LIN bus termination resistances and for shorts to battery or ground

Signal parameters

CAN bus: CAN_H and CAN_L voltages (idle ~2.5 V; differential ~0 V idle, ~2 V dominant)
Message IDs associated with suspension control module B (module heartbeat / status frames) — presence and periodicity
Message frequency (expected heartbeat rate, e.g., periodic alive messages every X ms)
Payload contents expected: ride height values, damper states, fault/status bits — verify values are within expected ranges
Checksum or CRC fields if used by the module protocol
Wake/sleep requests and power state messages (module should respond when awake)

Diagnostic algorithm

Capture full network scan: use OEM diagnostic tool to read U-codes and related module reports; note freeze frame data and time stamps.
Reproduce the fault: cycle ignition, lock/unlock, and perform short drive to see if fault reappears and to capture network traffic.
Inspect connectors and wiring: remove and inspect the suspension control module B connector for corrosion, bent pins, or contamination. Repair any damaged wiring or pins.
Verify power and ground: with a DVOM, confirm stable battery voltage at module power terminal and good ground continuity to chassis.
Check CAN signals: using a scope or CAN analyzer, observe CAN_H and CAN_L at the module while the network is active. Look for proper levels, message frames, noise, or bus errors.
Trace network: if CAN activity is abnormal at the module, trace harness back to nearest junction/gateway and check continuity/shorts to other modules.
Cross-check other modules: use scan tool to confirm whether gateway or other modules report communication with suspension module B. If only this module reports invalid data, suspect module or immediate harness.
Software and calibration: verify module software/calibration level against OEM specifications; reflash or update if a mismatch or known software bug exists.
Clear codes and retest: after repairs, clear all codes, perform the requested relearn/initialization procedures for suspension system, and retest to confirm the issue is resolved.
Replace module only after confirming wiring, power, ground, and software are correct and the fault persists; program/recode new module per OEM procedure.

Likely causes

Water ingress/corrosion at the suspension module connector causing data corruption
Damaged CAN bus wiring (pinched, chafed, or broken) between module and gateway
Module lost proper supply voltage or a poor ground connection
Module firmware fault or failed internal processor
Gateway or other module re-transmitting incorrect values due to software/configuration error

Fault status

⚠️ Status

Invalid or out-of-range data received from Suspension Control Module B over the vehicle network; data integrity or communication fault detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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U043C — Invalid data received from the suspension control module B