Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2012 Toyota Avalon BaseFACTORY OEM SERVICE PROCEDURE
Vehicle Stability Control System
DTC CHART OF ABS:
| DTC Code | Description |
|---|---|
| C0200 | Right Front Wheel Speed Sensor Signal Malfunction |
| C0205 | Left Front Wheel Speed Sensor Signal |
| C0210 | Right Rear Wheel Speed Sensor Signal Malfunction |
| C0215 | Left Rear Wheel Speed Sensor Signal |
| C0226 | SFR Solenoid Circuit |
| C0236 | SFL Solenoid Circuit |
| C0246 | SRR Solenoid Circuit |
| C0256 | SRL Solenoid Circuit |
| C0273 | Open in ABS Motor Relay Circuit |
| C0274 | Short to B+ in ABS Motor Relay Circuit |
| C0278 | Open in ABS Solenoid Relay Circuit |
| C0279 | Short to B+ in ABS Solenoid Relay Circuit |
| C1225 | SM Solenoid Circuit |
| C1235 | Foreign Object is Attached on Tip of Front Speed Sensor RH |
| C1236 | Foreign Object is Attached on Tip of Front Speed Sensor LH |
| C1238 | Foreign Object is Attached on Tip of Rear Speed Sensor RH |
| C1239 | Foreign Object is Attached on Tip of Rear Speed Sensor LH |
| C1241 | Low Battery Positive Voltage or Abnormally High Battery Positive Voltage |
| C1243 | Acceleration Sensor Stuck Malfunction |
| C1244 | Open or Short in Acceleration Sensor Circuit |
| C1245 | Acceleration Sensor Output Malfunction |
| C1246 | Master Cylinder Pressure Sensor Malfunction |
| C1249 | Open in Stop Light Switch Circuit |
| C1251 | Open in Pump Motor Circuit |
| C1361 | Short Circuit in ABS Motor Fail Safe Relay Circuit |
| C1381 | Acceleration Sensor Power Supply Voltage Malfunction |
| C1442 | Invalid Data Received from Acceleration Sensor |
| U0073 | Control Module Communication Bus OFF |
| U0124 | Lost Communication with Lateral Acceleration Sensor Module |
DTC CHART OF VSC:
| DTC Code | Description |
|---|---|
| C1203 | ECM Communication Circuit Malfunction |
| C1210 | Zero Point Calibration of Yaw Rate Sensor Undone |
| C1231 | Steering Angle Sensor Circuit Malfunction |
| C1232 | Stuck in Acceleration Sensor |
| C1234 | Yaw Rate Sensor Malfunction |
| C1290 | Steering Angle Sensor Zero Point Malfunction |
| C1336 | Zero Point Calibration of Acceleration Sensor Undone |
| C1439 | Steering Angle Sensor Initialization Incomplete |
| C1440 | Unusual Bank Angle Detected |
| C1443 | Invalid Data Received from Yaw Rate Sensor |
| C1445 | Vehicle Driven with Steering Angle Sensor not Initialized |
| U0100 | Lost Communication with ECM / PCM |
| U0123 | Lost Communication with Yaw Rate Sensor Module |
| U0126 | Lost Communication with Steering Angle Sensor Module |
TEST MODE DTC OF ABS:
| DTC Code | Description |
|---|---|
| C1271 | Low Output Signal of Front Speed Sensor RH (Test Mode DTC) |
| C1272 | Low Output Signal of Front Speed Sensor LH (Test Mode DTC) |
| C1273 | Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) |
| C1274 | Low Output Signal of Rear Speed Sensor LH (Test Mode DTC) |
| C1275 | Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) |
| C1276 | Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) |
| C1277 | Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC) |
| C1278 | Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC) |
| C1279 | Acceleration Sensor Output Voltage Malfunction (Test Mode DTC) |
| C1281 | Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC) |
TEST MODE DTC OF VSC:
| DTC Code | Description |
|---|---|
| C0371 | Yaw Rate Sensor (Test Mode DTC) |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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