Code
U0126
Generic
U — Network/User
Lost Communication With Steering Angle Sensor Module
Views:
UK: 16
EN: 40
RU: 67
AI status
Completed
Completed
100%
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
- Confirm code with a reliable scan tool and record related U-codes and freeze-frame data.
- Check battery voltage and health. Low voltage can cause intermittent module comms.
- Inspect connectors and wiring at the steering angle sensor (column area) and gateway/BCM for damage, corrosion, and water ingress.
- Check fuses/relays for SAS and gateway/BCM power circuits; verify module has battery feed and a good ground at the connector pins.
- 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.
- Measure resistance between CAN_H and CAN_L with power off to confirm termination (~60 Ω).
- Use the scan tool to check whether the SAS module responds; if other modules are also not present, suspect bus or gateway issues.
- Perform a wiggle/stress test on wires and connectors while monitoring CAN messages and module presence to find intermittent faults.
- 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.
- Repair or replace damaged wiring/connectors, restore proper termination, repair grounds, or replace the steering angle sensor module as indicated.
- After repairs, clear codes, verify communication, and perform any required steering angle sensor calibration/relearn and module programming/software updates.
- 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
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Code
U0126
HYUNDAI
U — Network/User
Lost Communication With Steering Angle Sensor Module | Steering Angle Signal Fault
Views:
UK: 11
EN: 25
RU: 55
AI status
Completed
Completed
100%
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
- Confirm code with a reliable scan tool and record related U-codes and freeze-frame data.
- Check battery voltage and health. Low voltage can cause intermittent module comms.
- Inspect connectors and wiring at the steering angle sensor (column area) and gateway/BCM for damage, corrosion, and water ingress.
- Check fuses/relays for SAS and gateway/BCM power circuits; verify module has battery feed and a good ground at the connector pins.
- 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.
- Measure resistance between CAN_H and CAN_L with power off to confirm termination (~60 Ω).
- Use the scan tool to check whether the SAS module responds; if other modules are also not present, suspect bus or gateway issues.
- Perform a wiggle/stress test on wires and connectors while monitoring CAN messages and module presence to find intermittent faults.
- 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.
- Repair or replace damaged wiring/connectors, restore proper termination, repair grounds, or replace the steering angle sensor module as indicated.
- After repairs, clear codes, verify communication, and perform any required steering angle sensor calibration/relearn and module programming/software updates.
- 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
Your experience will help others
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Was this AI description helpful?
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Code
U0126
LAND ROVER
U — Network/User
Lost communication with the steering angle sensor module
Views:
UK: 10
EN: 18
RU: 35
AI status
Completed
Completed
100%
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
- Confirm code with a reliable scan tool and record related U-codes and freeze-frame data.
- Check battery voltage and health. Low voltage can cause intermittent module comms.
- Inspect connectors and wiring at the steering angle sensor (column area) and gateway/BCM for damage, corrosion, and water ingress.
- Check fuses/relays for SAS and gateway/BCM power circuits; verify module has battery feed and a good ground at the connector pins.
- 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.
- Measure resistance between CAN_H and CAN_L with power off to confirm termination (~60 Ω).
- Use the scan tool to check whether the SAS module responds; if other modules are also not present, suspect bus or gateway issues.
- Perform a wiggle/stress test on wires and connectors while monitoring CAN messages and module presence to find intermittent faults.
- 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.
- Repair or replace damaged wiring/connectors, restore proper termination, repair grounds, or replace the steering angle sensor module as indicated.
- After repairs, clear codes, verify communication, and perform any required steering angle sensor calibration/relearn and module programming/software updates.
- 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
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