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Home / DTC / U0126 — Lost Communication With Steering Angle Sensor Module

U0126 — Lost Communication With Steering Angle Sensor Module

Detailed page for trouble code U0126.

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Code

U0126

Generic U — Network/User

Lost Communication With Steering Angle Sensor Module

Brand: Generic
Type: U — Network/User
Views: UK: 15 EN: 28 RU: 43
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in CAN wiring between SAS and network
  • Corroded, loose, or damaged connector at the steering angle sensor or gateway module
  • Faulty steering angle sensor/module
  • Loss of power or ground to the steering angle sensor module
  • Faulty CAN bus termination or short to battery/ground
  • Intermittent wiring/harness damage (pinched, chafed, water intrusion)

Symptoms

  • Steering angle not displayed in scan tool or instrument cluster
  • ABS/ESP/stability or traction control warning lights illuminated
  • Loss or degradation of steering-related driver aids (ESC, lane keep, adaptive systems)
  • Diagnostic trouble code U0126 stored; other CAN communication codes may be present
  • Intermittent or permanent malfunction of systems that use steering angle data

What to check

  • Use a scan tool to confirm U0126 and note freeze-frame data and related U-codes
  • Scan for other CAN or module communication codes (U0100, U0121, U0155, etc.)
  • Visually inspect harness and connectors at the steering column/SAS and gateway/BCM for corrosion, damage, or water intrusion
  • Check applicable fuses and relays for the steering angle sensor and gateway/BCM circuits
  • Verify battery voltage is within specification (typically 12–14.5 V) during tests
  • Perform wiggle test on harness/connectors while monitoring CAN messages and module presence with a scan tool

Signal parameters

  • CAN bus idle voltages: CAN_H and CAN_L both ~2.5 V (recessive). Dominant state typically shifts CAN_H toward ~3.5 V and CAN_L toward ~1.5 V (values vary by vehicle)
  • Differential CAN bus voltage: nominal ~0 V recessive difference ≈ 0 V; dominant differential typically ~1.5–2.0 V
  • Module supply voltage: approximately battery voltage (9–16 V depending on system state) at SAS power pin
  • Module ground: near 0 Ω continuity to chassis ground
  • Steering angle message update: frequent periodic CAN messages (example 10–100 ms interval) or event-driven updates; absence indicates lost comms
  • CAN bus termination: combined resistance across CAN_H to CAN_L typically ~60 Ω (two 120 Ω resistors in parallel)

Diagnostic algorithm

  1. Confirm code with a reliable scan tool and record related U-codes and freeze-frame data.
  2. Check battery voltage and health. Low voltage can cause intermittent module comms.
  3. Inspect connectors and wiring at the steering angle sensor (column area) and gateway/BCM for damage, corrosion, and water ingress.
  4. Check fuses/relays for SAS and gateway/BCM power circuits; verify module has battery feed and a good ground at the connector pins.
  5. With ignition on, measure CAN_H and CAN_L at the SAS connector: confirm idle voltages (~2.5 V each) and correct differential behavior when messages are active.
  6. Measure resistance between CAN_H and CAN_L with power off to confirm termination (~60 Ω).
  7. Use the scan tool to check whether the SAS module responds; if other modules are also not present, suspect bus or gateway issues.
  8. Perform a wiggle/stress test on wires and connectors while monitoring CAN messages and module presence to find intermittent faults.
  9. If wiring and bus voltages are correct but module does not respond, attempt to communicate at the gateway or substitute a known-good module only if required and permitted by OEM procedures.
  10. Repair or replace damaged wiring/connectors, restore proper termination, repair grounds, or replace the steering angle sensor module as indicated.
  11. After repairs, clear codes, verify communication, and perform any required steering angle sensor calibration/relearn and module programming/software updates.
  12. Road test and re-scan to confirm the fault does not return.

Likely causes

  • Damaged or disconnected CAN wiring or connector at the steering angle sensor
  • Loss of module power or ground (fuse, connector, circuit fault)
  • Faulty steering angle sensor module
  • Intermittent connector corrosion or moisture intrusion causing intermittent comms
  • Faulty gateway/BCM that routes CAN messages

Fault status

⚠️ Status
U0126 — Lost Communication With Steering Angle Sensor Module. The steering angle sensor is not responding or its CAN messages are not received by other control modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

U0100 U0121 U0155 U0124 U0164
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Code

U0126

HYUNDAI U — Network/User

Lost Communication With Steering Angle Sensor Module | Steering Angle Signal Fault

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 11 EN: 20 RU: 36
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in CAN wiring between SAS and network
  • Corroded, loose, or damaged connector at the steering angle sensor or gateway module
  • Faulty steering angle sensor/module
  • Loss of power or ground to the steering angle sensor module
  • Faulty CAN bus termination or short to battery/ground
  • Intermittent wiring/harness damage (pinched, chafed, water intrusion)

Symptoms

  • Steering angle not displayed in scan tool or instrument cluster
  • ABS/ESP/stability or traction control warning lights illuminated
  • Loss or degradation of steering-related driver aids (ESC, lane keep, adaptive systems)
  • Diagnostic trouble code U0126 stored; other CAN communication codes may be present
  • Intermittent or permanent malfunction of systems that use steering angle data

What to check

  • Use a scan tool to confirm U0126 and note freeze-frame data and related U-codes
  • Scan for other CAN or module communication codes (U0100, U0121, U0155, etc.)
  • Visually inspect harness and connectors at the steering column/SAS and gateway/BCM for corrosion, damage, or water intrusion
  • Check applicable fuses and relays for the steering angle sensor and gateway/BCM circuits
  • Verify battery voltage is within specification (typically 12–14.5 V) during tests
  • Perform wiggle test on harness/connectors while monitoring CAN messages and module presence with a scan tool

Signal parameters

  • CAN bus idle voltages: CAN_H and CAN_L both ~2.5 V (recessive). Dominant state typically shifts CAN_H toward ~3.5 V and CAN_L toward ~1.5 V (values vary by vehicle)
  • Differential CAN bus voltage: nominal ~0 V recessive difference ≈ 0 V; dominant differential typically ~1.5–2.0 V
  • Module supply voltage: approximately battery voltage (9–16 V depending on system state) at SAS power pin
  • Module ground: near 0 Ω continuity to chassis ground
  • Steering angle message update: frequent periodic CAN messages (example 10–100 ms interval) or event-driven updates; absence indicates lost comms
  • CAN bus termination: combined resistance across CAN_H to CAN_L typically ~60 Ω (two 120 Ω resistors in parallel)

Diagnostic algorithm

  1. Confirm code with a reliable scan tool and record related U-codes and freeze-frame data.
  2. Check battery voltage and health. Low voltage can cause intermittent module comms.
  3. Inspect connectors and wiring at the steering angle sensor (column area) and gateway/BCM for damage, corrosion, and water ingress.
  4. Check fuses/relays for SAS and gateway/BCM power circuits; verify module has battery feed and a good ground at the connector pins.
  5. With ignition on, measure CAN_H and CAN_L at the SAS connector: confirm idle voltages (~2.5 V each) and correct differential behavior when messages are active.
  6. Measure resistance between CAN_H and CAN_L with power off to confirm termination (~60 Ω).
  7. Use the scan tool to check whether the SAS module responds; if other modules are also not present, suspect bus or gateway issues.
  8. Perform a wiggle/stress test on wires and connectors while monitoring CAN messages and module presence to find intermittent faults.
  9. If wiring and bus voltages are correct but module does not respond, attempt to communicate at the gateway or substitute a known-good module only if required and permitted by OEM procedures.
  10. Repair or replace damaged wiring/connectors, restore proper termination, repair grounds, or replace the steering angle sensor module as indicated.
  11. After repairs, clear codes, verify communication, and perform any required steering angle sensor calibration/relearn and module programming/software updates.
  12. Road test and re-scan to confirm the fault does not return.

Likely causes

  • Damaged or disconnected CAN wiring or connector at the steering angle sensor
  • Loss of module power or ground (fuse, connector, circuit fault)
  • Faulty steering angle sensor module
  • Intermittent connector corrosion or moisture intrusion causing intermittent comms
  • Faulty gateway/BCM that routes CAN messages

Fault status

⚠️ Status
U0126 — Lost Communication With Steering Angle Sensor Module. The steering angle sensor is not responding or its CAN messages are not received by other control modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

U0100 U0121 U0155 U0124 U0164
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U0126

LAND ROVER U — Network/User

Lost communication with the steering angle sensor module

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 7 EN: 11 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in CAN wiring between SAS and network
  • Corroded, loose, or damaged connector at the steering angle sensor or gateway module
  • Faulty steering angle sensor/module
  • Loss of power or ground to the steering angle sensor module
  • Faulty CAN bus termination or short to battery/ground
  • Intermittent wiring/harness damage (pinched, chafed, water intrusion)

Symptoms

  • Steering angle not displayed in scan tool or instrument cluster
  • ABS/ESP/stability or traction control warning lights illuminated
  • Loss or degradation of steering-related driver aids (ESC, lane keep, adaptive systems)
  • Diagnostic trouble code U0126 stored; other CAN communication codes may be present
  • Intermittent or permanent malfunction of systems that use steering angle data

What to check

  • Use a scan tool to confirm U0126 and note freeze-frame data and related U-codes
  • Scan for other CAN or module communication codes (U0100, U0121, U0155, etc.)
  • Visually inspect harness and connectors at the steering column/SAS and gateway/BCM for corrosion, damage, or water intrusion
  • Check applicable fuses and relays for the steering angle sensor and gateway/BCM circuits
  • Verify battery voltage is within specification (typically 12–14.5 V) during tests
  • Perform wiggle test on harness/connectors while monitoring CAN messages and module presence with a scan tool

Signal parameters

  • CAN bus idle voltages: CAN_H and CAN_L both ~2.5 V (recessive). Dominant state typically shifts CAN_H toward ~3.5 V and CAN_L toward ~1.5 V (values vary by vehicle)
  • Differential CAN bus voltage: nominal ~0 V recessive difference ≈ 0 V; dominant differential typically ~1.5–2.0 V
  • Module supply voltage: approximately battery voltage (9–16 V depending on system state) at SAS power pin
  • Module ground: near 0 Ω continuity to chassis ground
  • Steering angle message update: frequent periodic CAN messages (example 10–100 ms interval) or event-driven updates; absence indicates lost comms
  • CAN bus termination: combined resistance across CAN_H to CAN_L typically ~60 Ω (two 120 Ω resistors in parallel)

Diagnostic algorithm

  1. Confirm code with a reliable scan tool and record related U-codes and freeze-frame data.
  2. Check battery voltage and health. Low voltage can cause intermittent module comms.
  3. Inspect connectors and wiring at the steering angle sensor (column area) and gateway/BCM for damage, corrosion, and water ingress.
  4. Check fuses/relays for SAS and gateway/BCM power circuits; verify module has battery feed and a good ground at the connector pins.
  5. With ignition on, measure CAN_H and CAN_L at the SAS connector: confirm idle voltages (~2.5 V each) and correct differential behavior when messages are active.
  6. Measure resistance between CAN_H and CAN_L with power off to confirm termination (~60 Ω).
  7. Use the scan tool to check whether the SAS module responds; if other modules are also not present, suspect bus or gateway issues.
  8. Perform a wiggle/stress test on wires and connectors while monitoring CAN messages and module presence to find intermittent faults.
  9. If wiring and bus voltages are correct but module does not respond, attempt to communicate at the gateway or substitute a known-good module only if required and permitted by OEM procedures.
  10. Repair or replace damaged wiring/connectors, restore proper termination, repair grounds, or replace the steering angle sensor module as indicated.
  11. After repairs, clear codes, verify communication, and perform any required steering angle sensor calibration/relearn and module programming/software updates.
  12. Road test and re-scan to confirm the fault does not return.

Likely causes

  • Damaged or disconnected CAN wiring or connector at the steering angle sensor
  • Loss of module power or ground (fuse, connector, circuit fault)
  • Faulty steering angle sensor module
  • Intermittent connector corrosion or moisture intrusion causing intermittent comms
  • Faulty gateway/BCM that routes CAN messages

Fault status

⚠️ Status
U0126 — Lost Communication With Steering Angle Sensor Module. The steering angle sensor is not responding or its CAN messages are not received by other control modules.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

Similar codes

U0100 U0121 U0155 U0124 U0164
Workshop Manuals

Repair manuals for LAND ROVER

3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

199,00 UAH
Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
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Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

199,00 UAH
Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
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