Code
C1506
MITSUBISHI
C — Chassis
Steering angle sensor error
Views:
UK: 3
EN: 14
RU: 18
AI status
Completed
Completed
100%
Causes
- Failed or degraded steering angle sensor
- Damaged wiring harness or connector (power, ground, signal, CAN)
- Poor/cracked connector pins or corrosion
- Loss of reference power or ground to the sensor
- Steering column damage or mechanical binding affecting sensor movement
- Faulty ABS/VCU/ECU or communication bus (CAN/LIN) error
Symptoms
- ESP/ASC/ABS warning lamp illuminated
- Traction control or stability assist disabled
- Steering feel or EPS warnings (on some models)
- Vehicle stability functions may be limited or disabled
- DTC present and reappears after clearing without repair
- Possible steering angle reading drift or incorrect steering wheel angle on scan tool
What to check
- Read all stored and pending DTCs from ABS/ESC and related modules; note freeze-frame data
- Confirm battery voltage is stable (no low-voltage conditions during tests)
- Inspect steering column area for physical damage and correct sensor mounting
- Visually inspect SAS connectors and wiring for corrosion, chafing, broken wires or pin damage
- Check fuses and relays that supply power to ABS/ESC/SAS
- Monitor live steering angle values with a scan tool while turning the wheel; check for smooth, proportional response
Signal parameters
- Power supply: typically 5 V reference or vehicle battery-derived supply (verify model-specific value)
- Ground continuity to chassis ground (near 0 Ω expected)
- Analog output: 0–5 V or 0.5–4.5 V range for many sensors (model dependent)
- Digital output: CAN/LIN messages containing steering angle and status (if applicable)
- Zero/center offset: steering straight-ahead reported as mid-scale/counts or 0° depending on sensor type
- Response: continuous, smooth change in value when steering wheel turned; no sudden jumps or dropouts
Diagnostic algorithm
- Retrieve and record all DTCs from ABS/ESC and related modules. Note any U-codes (network) or additional C-codes.
- Clear codes and perform a short test drive to see if C1506 returns and under what conditions.
- With ignition ON, backprobe the SAS connector: verify presence of correct supply voltage, good ground and proper signal (analog voltage or CAN TX/RX activity).
- Inspect wiring and connectors for corrosion, broken strands, or damage. Wiggle harness while monitoring live data to detect intermittent faults.
- Check continuity from sensor pins to the corresponding ECU pins; repair any opens/shorts.
- If CAN/LIN communication is used, check bus integrity and termination, and scan for bus errors; isolate faulty module if bus noise present.
- If sensor electricals and communication check out but values are implausible, remove and bench-test or replace the sensor per OEM procedure.
- After repair or replacement, perform steering angle sensor initialization/calibration as required by the service manual (often required after battery disconnect, steering column work, or sensor replacement).
- Clear codes, confirm no other related codes exist, and perform a road test to verify correct operation of steering angle readings and stability systems.
- Safety note: if working near airbag components, follow SRS safety procedures (disconnect battery and wait recommended time) per manufacturer guidance.
Likely causes
- Intermittent or open signal wire between SAS and ECU
- Corroded or bent connector pins at sensor or ECU
- Sensor internal failure (electronics or mechanical encoder)
- Failed power supply or ground at the sensor (fuse, relay, connector)
- CAN bus fault preventing SAS data from reaching vehicle control module
- Incorrect steering angle sensor zero-point — needs initialization after wheel alignment or steering column removal
Fault status
Status
Steering angle sensor malfunction — circuit or communication error detected. May cause ESC/ABS/traction control warnings and require wiring, sensor, or module repair plus sensor calibration.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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