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C106600

DTC C106600 indicates missing or incorrect Steering Angle Sensor (SAS) calibration data, or that the calibration procedure was never performed — Atto 3

Braking System

DTC C106600 indicates missing or incorrect Steering Angle Sensor (SAS) calibration data, or that the calibration procedure was never performed.

This sensor typically resides within the steering column or ESP control unit and monitors the steering wheel's absolute angle, rotation direction, and angular velocity in real time.

It serves as a core input signal for the Electronic Stability Program (ESP/ESC), Electric Power Steering (EPS), and Automatic Emergency Braking (AEB) systems.

The system triggers this fault code upon detecting a calibration data validation failure, or a significant deviation between the sensor's output angle and the theoretical zero position during straight-line driving (typically required to be within -5° to +5°).

Consequently, the ESP/ESC function enters a degraded or failure mode.

This may cause the vehicle to lose skid control during emergency avoidance maneuvers or on slippery roads; however, basic hydraulic braking functions typically remain unaffected.

3
Cases Logged
5
Causes
Likely Causes — Atto 3
  • 1Failure to perform the steering angle calibration procedure after replacing the steering gear, steering column, steering wheel, or ESP control unit.
  • 2After a vehicle collision, chassis geometry changes or the steering angle sensor physical mounting position shifts, causing zero-position mark misalignment.
  • 3Prolonged battery disconnection, abnormal system power supply voltage, or a control unit software upgrade caused the loss of calibration data stored in the ECU non-volatile memory.
  • 4Internal Hall or photoelectric element fault in the steering angle sensor, causing the output signal to mismatch the actual mechanical position.
  • 5Four-wheel alignment parameters (such as front toe and camber) are severely out of specification, preventing the steering wheel from mechanically centering during straight-line driving and exceeding the system compensation range.
What To Do
  • 1
    Pre-inspection preparation: Park the vehicle on level ground, adjust tyre pressures to standard values, confirm the steering wheel is in the mechanical centre position (verify by visually checking the front wheels are straight or removing the steering wheel to check alignment marks), and clear unrelated fault codes.
  • 2
    Read data stream: Use BYD VDS or a generic diagnostic tool to access the Chassis/ABS/ESP system and read the Steering Angle Sensor (SAS) live data stream. Verify the angle value is within -5° to +5° while driving the vehicle straight. If the deviation is too large, perform a mechanical adjustment or calibration.
  • 3
    Wiring inspection: Check the steering angle sensor connector for looseness (especially on accident-repaired vehicles). Measure the sensor supply voltage (should be 12V±0.5V), ground resistance (<1Ω), and CAN-H/CAN-L line voltage (approximately 2.5V, normal differential signal).
  • 4
    Sensor zero position check: For external steering angle sensors (such as Kostal brand), remove the sensor and verify the installation locating indicator aligns with the steering column zero position mark. Reinstall the sensor if misaligned.
  • 5
    Perform the calibration procedure: Use the diagnostic tool to access the Special Functions menu. Sequentially perform the yaw rate sensor calibration (if applicable), lateral acceleration sensor calibration (if applicable), and finally the steering angle sensor calibration (SAS Calibration/Steering Angle Learning). Confirm the display shows 'Calibration successful'.
  • 6
    Verification and road test: Clear the fault code, start the vehicle, and verify the ESP/ESC warning light on the instrument cluster turns off. Perform a low-speed straight-line drive and left/right steering test. Confirm the angle change in the data stream matches the actual steering and no abnormal warnings occur.
Real-World Cases
BYD DTC AI Analysis

BYD Song Pro steering angle sensor calibration fault after accident repair

✓
Following accident repairs on a 2018-2020 BYD Song Pro, the instrument cluster ESP warning light stayed on and the multifunction video controller could not complete calibration. Technicians pulled codes U101586, C106600 (SAS not calibrated) and U12608 with a diagnostic tool, indicating a calibration fault in the ESP system. They first isolated the fault to the steering angle sensor based on the DTCs and tried recalibrating with the VDS diagnostic tool, but the procedure failed. They then checked the sensor power supply and CAN communication lines, finding no hardware faults. When removing the steering angle sensor (Keshida brand), they found the sensor mounting position had deviated from the zero-position mark—the positioning indicator was misaligned, so the system could not recognise the correct steering centre. Following the sensor installation specifications strictly, they reinstalled the steering angle sensor to the zero position, aligning the positioning indicator precisely with the zero mark. With the BYD VDS diagnostic tool reading real-time steering angle data, they ran the 'Steering Angle Sensor Calibration' routine. Once calibration finished, they cleared the fault codes and the ESP system returned to normal. The repair summary emphasizes that Song Pro steering angle sensors must strictly follow the zero-position indicator during installation, or fault code C106600 will recur.
Original source ↗
BYD DTC AI Analysis

BAIC Senova ABS/ESP System SAS Calibration Error (DTC C106600 Technical Reference Case)

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ABS/ESP warning light on; electronic stability program function limited. Scanned and retrieved DTC "C106600 SAS Calibration Error". Connected an Autel MS909EV to the chassis system and read the data stream. The steering angle sensor (SAS) showed an angle other than 0° while driving straight, indicating lost or incorrect calibration data. Needed steering angle relearning. Performed the steering angle learning procedure: enter [Common Special Functions] → select [Steering Angle Learning] → click [ABS (Anti-lock Braking System)/ESP (Electronic Stability System)] → select [Yaw Rate Sensor Calibration]. Confirmed the vehicle met the prerequisites (parked on level ground, steering wheel mechanically centered, vehicle stationary with no steering force applied), then clicked [OK]. Once the screen displayed "Calibration Complete", exited the program. DTC C106600 cleared successfully and the ABS/ESP system returned to normal.
Original source ↗
BYD DTC AI Analysis

BYD Qin/Tang/Han Series Steering Angle Sensor Zero Position Loss Fault (Technical Manual Case)

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After replacing the steering gear, steering column, or steering wheel, the instrument cluster displays "Check ESP System" or "Check ABS System", accompanied by heavy steering or ESP failure. The scan tool retrieves chassis system DTC C106600 (SAS not calibrated), sometimes with C005128 (SAS over-range) or C005154 (SAS not calibrated). Using the BYD VDS or a generic scanner, access the Chassis system and confirm the steering angle sensor current angle does not match the mechanical centre position (should read between -5° and +5°). Check the sensor plug connection, supply voltage (normal 12V), and CAN bus voltage (approx. 2.5V). Rule out wiring faults, then proceed with recalibration. First, centre the steering wheel mechanically (visually confirm the front wheels point straight ahead with the steering wheel centered). Use the scan tool to enter the "Chassis System" or "ESP System" and run "SAS Calibration" or "Steering Angle Learning". Some BYD models require this sequence: 1. Yaw rate sensor calibration; 2. Lateral acceleration sensor calibration; 3. Steering angle sensor calibration. Carry out a road test after successful calibration to confirm the ESP warning light turns off and the system operates normally.
Original source ↗
Other Atto 3 Fault Codes
P0A0DBattery Energy Control Module Requested MIL IlluminationP0AA6Hybrid Battery Voltage System Isolation FaultP1A00Drive Motor "A" Performance — BYD proprietaryB1108For the BYD Song MAX (2017–2019), DTC B1108 indicates a short circuit in the PM2.5 air quality detection module (dust sensor) or its wiring harness. The sensor uses laser scattering to detect in-cabin and outside PM2.5 concentrations and transmits data to the HVAC ECU via the LIN bus or an analog signal. Short circuit conditions include: 1) Sensor power supply wire (+5V/+12V) shorted to ground 2) Signal wire shorted to power or ground 3) Short circuit in the sensor's internal photoelectric detection circuit This fault prevents the automatic climate control from switching between fresh air and recirculation based on air quality. The system enters fail-safe mode (typically forced recirculation). Severe short-circuit current can destroy the HVAC ECU sampling circuit. The system classifies this as a Level 3 severe fault and restricts vehicle operation to prevent electrical fires or controller damage. For other BYD models (such as the Qin EV, E5, and Song DM), B1108 indicates a driver-side sunload sensor fault, reflecting differences in DTC definitions across models.B110811This DTC indicates a short circuit in the air conditioning system PM2.5 air quality sensor (rapid detector). Specifically, abnormal continuity exists between the sensor power supply circuit or signal output circuit and body ground or battery positive. This causes the control module (ACU/air conditioning controller) to detect abnormal current or a voltage signal outside the valid range (typically 0V or supply voltage). The PM2.5 sensor monitors internal and external particulate concentrations, providing the data the automatic air conditioning system uses to switch between fresh air and recirculation modes. A short circuit disables the air quality monitoring function. This fault may force the air conditioning system into recirculation protection mode and trigger related thermal management system faults, as the air conditioning system acts as a key actuator in vehicle thermal management. In severe cases, the short circuit current can damage the internal sampling circuit of the air conditioning controller or overheat the wiring harness.
Data confidence: Official This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.