Code
C1956
LAND ROVER
C — Chassis
Steering angle sensor - circuit failure
Views:
UK: 5
EN: 15
RU: 29
AI status
Completed
Completed
100%
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
Similar codes
Workshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
C1956
Other
C — Chassis
Steering Angle Sensor Circuit Failure
Views:
UK: 17
EN: 29
RU: 40
AI status
Completed
Completed
100%
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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