U0126

Code

LAND ROVER U — Network/User

Lost communication with the steering angle sensor module

Brand: LAND ROVER

Type: U — Network/User

Views: UK: 20 EN: 53 RU: 66

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Page language: EN

Causes

Open or short in CAN bus wiring (CAN_H/CAN_L) to steering angle sensor module
Faulty steering angle sensor module or steering column control unit
Poor or corroded connector pins, damaged connector or physical harness damage
Power supply or ground fault at the steering angle sensor module
CAN bus termination or network topology fault (missing/shorted termination resistor)
Intermittent module wake-up or software/configuration error

Symptoms

Steering angle data unavailable in scan tool
DTC U0126 stored in multiple control modules
Stability control, traction control, or ABS warnings illuminated
Steering-dependent features (lane-keep, adaptive steering, DSC) disabled or limited
Possible intermittent communication faults or loss of related functions during driving

What to check

Retrieve freeze frame and full DTC list from all network modules (ABS, SRS, PCM, BCM)
Check battery voltage and vehicle power integrity (12V) with engine off and running
Visually inspect the steering column harness, connectors and nearby junctions for damage, corrosion or pin push-out
Check relevant fuses and relays for the steering/steering column modules
Measure CAN bus voltages at the steering angle sensor connector: CAN_H ~2.5V idle, CAN_L ~2.5V idle (differential ~0V idle) and look for dominant recessive states with oscilloscope
Measure CAN bus termination resistance (approx. 60 ohms across CAN_H and CAN_L with ignition on)

Signal parameters

CAN bus idle voltage: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (measured to chassis ground)
Differential idle voltage: ~0 V (dominant bits show differential swings)
Approximate bus termination resistance: ~60 Ω across CAN_H and CAN_L (two 120 Ω terminators in parallel)
Expected message frequency: steering angle messages typically at 10–100 Hz (tool-dependent)

Diagnostic algorithm

Read and record all DTCs and freeze-frame data from all modules; note any other network U-codes. 2) Attempt to clear codes and see if U0126 returns. 3) Visually inspect connector and harness at steering angle sensor/steering column; repair any obvious damage. 4) Verify module power and ground pins have correct voltages and good ground continuity. 5) Check fuses/relays that feed the steering column module. 6) Backprobe CAN_H and CAN_L at the steering angle sensor connector; with ignition on, measure voltages and observe waveform with scope if possible. 7) Measure resistance across CAN_H and CAN_L (~60 Ω). 8) If bus shows abnormal voltage/waveform, isolate sections by disconnecting suspected modules or splicing points to find fault; repair short/open. 9) If bus is healthy but module does not transmit, try swapping or bench-testing the steering angle sensor module if available or replace with known-good unit. 10) After repair or replacement, reprogram/calibrate the steering angle sensor per manufacturer procedures (SAS auto-learn or alignment). 11) Clear codes and perform test drive to confirm no reoccurrence and proper system operation.

Likely causes

Damaged connector or wiring at steering column (pin corrosion, broken wire)
Loss of module ground or 12V feed to the steering angle sensor module
CAN bus short to power or ground near the steering angle sensor
Failed steering angle sensor/module (internal electronics)

Fault status

⚠️ Status

Lost communication with steering angle sensor module — the module is not responding on the vehicle CAN network (no valid steering angle messages). May cause stability/steering-related features to be disabled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-3.0 hours

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U0126 — Lost communication with the steering angle sensor module