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.
2024 Toyota GR86 Base, Automatic TransFACTORY OEM SERVICE PROCEDURE
Electronically Controlled Brake System
ELECTRONICALLY CONTROLLED BRAKE SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| DTC Code | Description |
|---|---|
| C1211 | Front Right ABS Sensor Circuit |
| C1212 | Front Right ABS Sensor Signal |
| C1221 | Front Left ABS Sensor Circuit |
| C1222 | Front Left ABS Sensor Signal |
| C1231 | Rear Right ABS Sensor Circuit |
| C1232 | Rear Right ABS Sensor Signal |
| C1241 | Rear Left ABS Sensor Circuit |
| C1242 | Rear Left ABS Sensor Signal |
| C1251 | Wheel speed sensor system |
| C1252 | Wheel speed sensor signal of one of the wheels |
| C1311 | FR Hold Valve |
| C1312 | FR Pressure Reducing Valve |
| C1321 | FL Hold Valve |
| C1322 | FL Pressure Reducing Valve |
| C1331 | RR Hold Valve |
| C1332 | RR Pressure Reducing Valve |
| C1341 | RL Hold Valve |
| C1342 | RL Pressure Reducing Valve |
| C1351 | Normal Opening Valve 1 |
| C1352 | Normal Opening Valve 2 |
| C1361 | Normal Closing Valve 1 |
| C1362 | Normal Closing Valve 2 |
| C1411 | Electrical Control Module |
| C1412 | Selected Parameter |
| C1413 | Power Supply Voltage |
| C1422 | VDC Interruption for Engine Convenience |
| C1423 | Different ECU Specifications |
| C1424 | ECM |
| C1431 | AT |
| C1432 | Different ECU specifications |
| C1441 | EyeSight Request Pressure abnormal |
| C1511 | Valve Relay |
| C1512 | Valve system |
| C1521 | Motor Relay |
| C1531 | BLS OFF Stuck |
| C1532 | BLS ON Stuck |
| C1541 | Clutch Switch OFF Malfunction |
| C1571 | Brake Lamp Relay OFF Stuck |
| C1572 | Brake Lamp Relay ON Stuck |
| C1581 | Brake Boost Negative Pressure abnormal |
| C1711 | Steering Angle Sensor |
| C1721 | Yaw Rate Sensor |
| C1731 | G Sensor Failure |
| C1732 | Lateral G Sensor |
| C1733 | Longitudinal G Sensor |
| C1741 | Pressure Sensor |
| C1742 | Wheel Cylinder Pressure Sensor |
| C1751 | Brake Boost Gauge Sensor |
| C1811 | System |
| C1E00 | Registration Fault Of Authentication Unit |
| U0073 | Control Module Communication Bus Off |
| U0079 | Control Module Communication Bus "G" Off |
| U0100 | Lost Communication With ECM/PCM "A" |
| U0101 | Lost Communication With TCM |
| U0126 | Lost Communication With Steering Angle Sensor Module |
| U0140 | Lost Communication With Body Control Module |
| U0146 | Lost Communication With Serial Data Gateway Module "A" |
| U0155 | Lost Communication With Instrument Panel Cluster (IPC) Control Module |
| U0401 | Invalid Data Received From ECM/PCM "A" |
| U0402 | Invalid Data Received From TCM |
| U0422 | Invalid Data Received From Body Control Module |
| U0423 | Invalid Data Received From Instrument Panel Cluster Control Module |
| U0428 | Invalid Data Received From Steering Angle Sensor Module |
| U1235 | Lost Communication With EyeSight |
| U1433 | Invalid Data Received From EyeSight |
| U1C00 | Invalid Authentication Data Received From Gateway |
| U1C07 | Invalid Authentication Data Received From ECM/PCM PU-Bus |
| U1C0C | Invalid Authentication Data Received From Eyesight PU-Bus |
| U1C0F | Invalid Authentication Data Received From Steering Angle Sensor Module CH-Bus |
| U1E00 | Lost Communication of Authentication Data With Gateway "A" PU-Bus |
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.