U1260

Code

LAND ROVER U — Network/User

SCP (+) circuit failure

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 20 EN: 39 RU: 13

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Page language: EN

Causes

Open circuit in SCP (+) wire or splice
Short to ground or battery on SCP (+) conductor
Corroded or damaged connector/pin at a module or junction block
Failed module transceiver or module with internal short
Water ingress or contamination in connector/junction box
Poor battery/ground connections or low supply voltage

Symptoms

One or more network-related warning messages on dash
Multiple control modules show communication fault or appear offline
Intermittent or total loss of convenience features (locks, windows, remote functions)
Possible drivability or ABS/ESP warnings if those modules lose communication
Freeze-frame or other U-codes stored in multiple modules relating to network loss
Occasional erratic behavior of modules when vehicle is cranked or when vibration occurs

What to check

Connect a full-function scan tool and read all modules; note all U-codes and associated freeze data
Check battery voltage and engine chassis ground condition; ensure strong stable supply (12.4–14.5 V)
Visual inspection of SCP wire routing, connectors, and junction blocks for damage, corrosion, or water ingress
Inspect and reseat connectors at modules on the SCP bus (BCM, IPC, ABS, etc.)
Perform a wiggle test of harness while monitoring live data for communication loss
Using a multimeter with ignition on, check for continuity to expected modules (with battery disconnected) and for unwanted short to ground or battery

Signal parameters

SCP (+) is a digital serial data signal — when active it shows pulsed/modulated voltage on the SCP conductor
A healthy bus will display a modulated waveform (not a steady 0 V or steady battery voltage) when viewed with a diagnostic oscilloscope
A short to ground will show near 0 V; a short to battery will show near battery voltage with no data pulses
Excessive current draw on the SCP line or distorted waveform indicates shorted transceiver or damaged wiring

Diagnostic algorithm

Record all stored codes and symptoms from every module with a scan tool; note which modules report loss of SCP communication.
Verify battery voltage and good chassis/body grounds; fix any low battery or poor ground condition before network diagnosis.
Perform visual inspection of SCP harness and connectors focusing on known junctions and areas prone to chafing or water ingress; repair obvious damage.
Backprobe or connector-sense the SCP (+) wire at convenient access points; with ignition ON, use an oscilloscope or lab scope to confirm data pulses. If steady 0 V or battery is present, suspect short/open.
If scope shows no pulses, isolate sections of the bus by disconnecting modules one at a time (or unplugging junction connectors) while observing the SCP line; when the fault clears, the last disconnected module or wiring section is suspect.
For short-to-ground/battery diagnosis, remove battery negative and check continuity from SCP (+) to ground and to battery positive; repair shorted wiring or replace damaged connector/splice.
Repair or replace damaged wiring, corrosion, or faulty connector pins. If a single module is confirmed faulty, replace the module per manufacturer procedures and reprogram if required.
Clear codes, reconnect all modules, retest drive cycle and re-scan all modules to confirm the U1260 does not return.

Likely causes

Chafed harness where it rubs against body or frame causing a short
Corrosion at a common junction connector (engine bay/junction box)
Connector pin back-out or bent pin at BCM/ECM on SCP circuit
Module failure at one of the nodes placing the SCP bus into a bus-off or fault condition
Recent body harness work or aftermarket accessory installation created an open/short

Fault status

⚠️ Status

SCP (+) circuit failure — positive SCP communication conductor is open/short/corrupted. Network communication may be degraded or lost.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours

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