U0151

Code

LAND ROVER U — Network/User

Lost communication with the restrictions control module

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 34 EN: 54 RU: 80

AI status

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Page language: EN

Causes

Open/shorted CAN bus wiring (CAN H/CAN L) or poor splices/repairs
Corroded, loose or damaged connector at Restrictions Control Module
Blown fuse or loss of module supply/ground
Module software/firmware mismatch or failed module
Other module on the network causing bus errors or heavy load
Intermittent wiring (chafing, water ingress) or poor body/chassis ground

Symptoms

MIL or instrument cluster warning related to restrictions control or communications
Specific functions controlled by the Restrictions Control Module are disabled or operate in a limited mode
Driver message like “Service Restrictions” or similar
Intermittent electrical faults or multiple modules reporting communication errors
Vehicle may enter limp or restricted performance depending on module role

What to check

Retrieve U0151 and all other stored/active DTCs from all networks using a capable OEM-level scanner
Check for related codes (other U-codes) indicating CAN bus or specific module faults
Visually inspect harness and connector at the Restrictions Control Module for corrosion, bent pins, water, or damage
Check fuses and power distribution for the module (vehicle battery positive feed and ignition-switched feed)
Verify chassis and module ground integrity (measure voltage drop or continuity)
Check CAN bus wiring continuity and look for obvious shorts to battery/ground

Signal parameters

Battery supply at module: ~11–14.5 V with key ON (measure at module connector)
Module ground: near 0 Ω continuity to chassis; voltage drop
CAN bus recessive voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (both lines)
CAN bus dominant voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (typical) — differential ~2 V when dominant
CAN bus termination: ≈ 60 Ω measured end-to-end across CAN_H and CAN_L
Bus error signs: high bus error counters, no module heartbeat or periodic messages observed on scan tool/scope

Diagnostic algorithm

Connect OEM-level diagnostic tool; read and record U0151 and any other present codes and freeze-frame data
Check for multiple U-codes across different modules — if present, suspect shared bus issue
Visually inspect module connector and harness; repair any corrosion, bent pins, or water ingress
Check fuses and measure module supply voltage at the module connector with key ON; repair any feed faults
Verify ground continuity from module to chassis/negative battery; clean/repair ground as necessary
Using a DMM or scope, measure CAN_H and CAN_L voltages at the module with key ON and engine off; confirm recessive voltages ~2.5 V and correct differential during activity
Measure termination resistance across CAN_H-L (≈60 Ω). If open or incorrect, trace/repair wiring and connectors
If bus voltages abnormal, isolate segment by disconnecting branches or modules to find short or noisy node
If wiring and power/ground check good and other nodes respond, perform module reflash/reprogram or attempt to re-initialize per manufacturer procedure
If module still does not respond after power/ground, wiring and reflash verified, consider module replacement and program/configure replacement per manufacturer; clear codes and road-test to verify repair
Document steps and results; do not replace modules without confirming wiring/power/ground and proper programming

Likely causes

Faulty or corroded connector/pins at the Restrictions Control Module
Loss of battery feed or ground to the module
CAN bus short to power or ground or high bus error rate from another node
Module internal failure or failed communications transceiver
Aftermarket accessory or recent repair disturbed the CAN network

Fault status

⚠️ Status

Lost communication with Restrictions Control Module — module not responding on vehicle communication bus or intermittent network communications detected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours

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U0151 — Lost communication with the restrictions control module