C1956

Code

LAND ROVER C — Chassis

Steering angle sensor - circuit failure

Brand: LAND ROVER

Type: C — Chassis

Views: UK: 17 EN: 78 RU: 54

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Page language: EN

Causes

Open/short in SAS wiring or connector
Corroded or loose connector at steering column sensor
Failed steering angle sensor (internal electronics)
Faulty or intermittent CAN/LIN communication to SAS or BCM
Blown fuse or poor ground affecting sensor reference voltage
Recent steering column repair, airbag/steering wheel removal or improper reassembly

Symptoms

ABS, DSC or traction control warning lamp illuminated
Steering angle value absent or implausible in diagnostic scan tool
Reduced or disabled stability/traction control intervention
Possible steering wheel angle indicator mismatch (wheel centered but angle shows non‑zero)
Stored C1956 fault and possibly related communication/ABS faults

What to check

Read and record all stored DTCs and freeze frame data with a capable diagnostic tool
Inspect SAS connector and wiring at the steering column for damage, corrosion, pin push‑outs or water ingress
Check fuses and main grounds related to steering column/ABS/SAS circuits
Verify vehicle battery voltage is stable (low battery can cause communication errors)
Compare steering wheel position (physical center) with live SAS data on scan tool
Check CAN/LIN bus for other module communication faults and inspect wiring harness continuity

Signal parameters

Sensor typically uses a 5 V reference (approx. 4.75–5.25 V) — confirm with vehicle manual
Signal output normally 0–5 V range (changes smoothly as wheel is turned); look for dropouts, flatlines or noise
Sensor ground continuity to chassis ground: low resistance (typically
CAN bus idle voltages approximately mid‑rail (use service info for exact values) and consistent messages from SAS module
Live steering angle value (degrees) should change proportionally and return to ~0° at straight ahead after calibration

Diagnostic algorithm

Connect a factory or OE‑level scan tool; record all codes and freeze frame data. Note any related CAN/communication codes.
Verify current steering angle live data vs physical steering wheel position. Turn wheel slowly and observe for smooth, proportional change.
Visually inspect the steering column harness, SAS connector and pins for corrosion, bent pins, push‑outs, chafing, or water damage.
With ignition on, backprobe the SAS connector: confirm 5 V reference present, sensor ground continuity, and signal voltage present and changing while turning wheel.
If reference or ground missing or unstable: trace wiring to fuse/body control module and repair open/short/poor ground. Replace corroded connector terminals as needed.
If voltages present but signal is implausible or noisy: scope the signal lines (or use a high‑resolution multimeter) to look for noise, dropouts or flatlines — consider sensor replacement if internal fault suspected.
Check CAN bus health: scan for lost messages from SAS, measure bus voltages, and repair bus faults before replacing modules/sensors.
After any wiring or sensor repairs, clear codes, perform required SAS/steering angle calibration and any required ECU software updates.
Road test and re-scan. If C1956 returns, escalate to module bench testing or replace SAS/related module per service information.

Likely causes

Damaged connector/wiring at the steering column (abrasion or pin corrosion)
Intermittent 5 V reference or ground loss to the sensor
Failed SAS unit (common after water ingress or impact)
CAN bus data loss or incorrect module addressing after replacement
Incorrect or missing SAS calibration after steering/steering angle sensor replacement

Fault status

⚠️ Status

Steering angle sensor — circuit failure (loss or implausible signal from SAS). May disable stability/ABS-related functions until repaired and recalibrated.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5–2.5 hours

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