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Home / DTC / C1278 — Failure in the angle 1 and 2 signal of the steering wheel

C1278 — Failure in the angle 1 and 2 signal of the steering wheel

Detailed page for trouble code C1278.

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C1278

LAND ROVER C — Chassis

Failure in the angle 1 and 2 signal of the steering wheel

Brand: LAND ROVER
Type: C — Chassis
Views: UK: 9 EN: 13 RU: 6
AI status
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Page language: EN

Causes

  • Damaged or corroded connector at steering angle sensor
  • Broken or shorted wiring between sensor and control module
  • Faulty steering angle sensor or internal electronics
  • Loss of power or ground to the sensor
  • CAN/LIN network communication error affecting angle data
  • Improper sensor calibration after repairs or battery loss

Symptoms

  • ABS/ESC or traction control warning lamp illuminated
  • Steering angle or stability warnings on instrument cluster
  • Loss or reduced operation of electronic stability/assist features
  • Inaccurate or drifting steering angle reading in diagnostic tool
  • Possible limp or degraded steering assist
  • Intermittent faults that may clear and return

What to check

  • Read and record freeze-frame data and stored DTCs from all modules
  • Confirm battery voltage is stable (12.4–14.8 V) during checks
  • Visual inspection of steering column area: connectors, wiring harness, signs of water or damage
  • Check connector pins for corrosion, bent pins or poor contact
  • Scan live data: compare angle 1 and angle 2 values for agreement and plausibility while turning wheel
  • Check for related communication (CAN/LIN) faults or other module errors

Signal parameters

  • Two redundant steering angle outputs should track each other closely (small offset only)
  • Analog sensor outputs typically in the ~0.5–4.5 V range depending on wheel position (vehicle specific)
  • Signals should vary smoothly with steering input; no sudden dropouts or spikes
  • If CAN/LIN type sensor, monitor expected message IDs and update rates with a scan tool (no missing frames)
  • Supply voltage to sensor should be stable and within vehicle specification (check service data)

Diagnostic algorithm

  1. Retrieve all stored DTCs and note timestamps/freeze-frame. Check for related C- or U-codes.
  2. Confirm vehicle battery voltage and perform a basic health check; low voltage can produce false errors.
  3. Inspect the steering column connectors and harness for damage, corrosion, or water ingress. Repair any visible problems.
  4. With a scan tool, observe live values for angle 1 and angle 2 while rotating the steering wheel. Note disagreement, dropouts or implausible values.
  5. Check supply and ground at the sensor connector. Repair any open/poor connections before further testing.
  6. If analog signals expected, probe the signal pins with a multimeter or oscilloscope and verify smooth voltage change across full lock to lock. Look for noise, spikes, or missing signal.
  7. Perform a wiggle test of the steering column harness while monitoring live data to detect intermittent faults.
  8. If communication-based (CAN/LIN), check for correct message IDs and bus integrity; verify termination and no other modules reporting bus errors.
  9. If wiring checks pass and signals are invalid or inconsistent, replace the steering angle sensor assembly following manufacturer safety procedures (airbag/clock spring handling).
  10. After repair or replacement, perform steering angle sensor calibration (zero/two-point calibration) with a compatible scan tool and clear DTCs. Road test and re-check for reappearance.
  11. If fault persists after sensor replacement and wiring verified, consider suspect control module (EPS/ABS/BCM) or perform manufacturer-specific module tests.

Likely causes

  • Corroded/loose connector at steering column sensor
  • Open or short in signal wiring (pin chafe or connector damage)
  • Failed steering angle sensor requiring replacement
  • ECU/module receiving sensor data is faulty or has lost reference voltage/ground
  • Faulty CAN bus wiring or another module sending invalid angle messages

Fault status

⚠️ Status
Steering wheel angle sensor — angle channel 1 and/or 2 failure. Redundant angle signals inconsistent, missing or out of range; stability/ABS/EPS features may be impaired.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

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