Code
C1277
LAND ROVER
C — Chassis
Steering angles 1 and 2 - circuit failure
Views:
UK: 10
EN: 20
RU: 17
AI status
Completed
Completed
100%
Causes
- Damaged or disconnected steering angle sensor(s)
- Open, short or high-resistance wiring between sensor(s) and control module
- Corroded or loose connector pins (sensor, clock spring, ABS/ESP module)
- Faulty clock spring in the steering column
- Loss of power or ground to sensor(s)
- CAN bus or module communication fault
Symptoms
- ESC/ABS/Traction control warning lamp illuminated
- Possible steering angle warning or message on dash
- Loss or reduction of stability/traction control intervention
- Erratic or incorrect steering angle readings in scan tool live data
- Cruise control or adaptive systems may be disabled
- DTCs stored in ABS/ESP and/or airbag modules
What to check
- Read and record all stored DTCs and freeze-frame data from ABS/ESP and airbag modules
- Verify vehicle battery voltage is within nominal range
- Visual inspection of steering column area, clock spring, sensor connectors and wiring harness for damage, chafing or corrosion
- Check for recent steering, airbag, or wheel replacements or alignment work
- Confirm whether steering angle sensor calibration (SAS) has been performed after repairs
Signal parameters
- Reference/power supply to steering angle sensor(s) present (typically ignition-switched 5 V or 12 V depending on design)
- Ground continuity between sensor(s) and chassis ground
- Steering wheel angle output(s) change smoothly and proportionally with wheel rotation (live data shows angles in degrees)
- Two sensor outputs should agree within a few degrees; large disagreement or one output stuck indicates fault
- Signal update rate consistent and steady (tens of Hz)
- No excessive electrical noise, intermittent dropouts or stuck values
Diagnostic algorithm
- Connect a compatible diagnostic tool to read C1277 and any related codes; record freeze frame and live data for steering angle 1 and 2
- Inspect connectors and wiring at both steering angle sensor(s), clock spring, and ABS/ESP module for corrosion, bent pins, water ingress or physical damage
- With ignition on, verify supply voltage and ground at the sensor connector(s) using a multimeter; compare to manufacturer specifications
- Use scan tool live data: slowly turn steering wheel and confirm both steering angle channel values change smoothly and track together; note any channel that does not move or lags
- Perform a wiggle test on steering column harness and clock spring while observing live data for intermittent faults
- Check continuity and resistance of signal, reference and ground wires between sensor connector and ABS/ESP module; repair any opens/shorts found
- If wiring and connectors are good, swap or bench-test the steering angle sensor(s) if possible (or replace with known-good) and recheck
- Inspect and test CAN bus if sensor communicates over CAN; check for other CAN errors or module faults
- After repair or sensor replacement, perform steering angle sensor calibration/initialization per manufacturer procedure and then clear codes and test drive to verify DTC does not return
- If fault persists after sensor and wiring verified, consider ABS/ESP module diagnostic or software update by dealer
Likely causes
- Clock spring wiring damage or internal failure
- Corroded/loose connector at sensor or ABS/ESP module
- Open/short in steering angle sensor harness (pinched at column)
- Failed steering angle sensor
Fault status
Status
Steering angles 1 and 2 circuit failure — disagreement, open, short or communication fault between redundant steering angle sensors detected. Stability/traction systems may be limited.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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