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 Sienna XLE, AWDFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Chart
If a trouble code is stored during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the appropriate information below.
SMART KEY SYSTEM (FOR START FUNCTION)
| DTC Code | Detection Item | Trouble Area | See |
|---|---|---|---|
| B2271 | Ignition Hold Monitor Malfunction | - AM2 No. 2 fuse - Power management control ECU - Harness or connector |
Refer to DTC B2271: Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction | - AM2 No. 2 fuse - Driver side junction block assembly (ACC relay) - Power management control ECU - Harness or connector |
Refer to DTC B2274: ACC Monitor Malfunction |
| B2277 | Detecting Vehicle Submersion | - Submersion of power management control ECU in water - Power management control ECU |
Refer to DTC B2277: Detecting Vehicle Submersion |
| B2282 | Vehicle Speed Signal Malfunction | - CAN communication system - Power management control ECU - Meter/gauge system - Harness or connector |
Refer to DTC B2282: Vehicle Speed Signal Malfunction; DTC B2283: Vehicle Speed Sensor Malfunction |
| B2283 | Vehicle Speed Sensor Malfunction | - CAN communication system - Power management control ECU - Meter/gauge system - Harness or connector |
Refer to DTC B2282: Vehicle Speed Signal Malfunction; DTC B2283: Vehicle Speed Sensor Malfunction |
| B2284 | Brake Signal Malfunction | - STOP fuse - AM2 No. 2 fuse - Stop light switch assembly - Engine control system - Power management control ECU - Harness or connector |
Refer to DTC B2284: Brake Signal Malfunction |
| B2285 | Steering Lock Position Signal Circuit Malfunction | - AM2 No. 2 fuse - Steering lock actuator assembly (steering lock ECU) - Power management control ECU - LIN communication system - Harness or connector |
Refer to DTC B2285: Steering Lock Position Signal Circuit Malfunction |
| B2286 | Runnable Signal Malfunction | - AM2 No. 2 fuse - Engine control system - Power management control ECU - Harness or connector |
Refer to DTC B2286: Runnable Signal Malfunction; DTC P0335: Crankshaft Position Sensor Circuit Malfunction (NE Signal) |
| P0335 | Crankshaft Position Sensor Circuit Malfunction (NE Signal) | - AM2 No. 2 fuse - Engine control system - Power management control ECU - Harness or connector |
Refer to DTC B2286: Runnable Signal Malfunction; DTC P0335: Crankshaft Position Sensor Circuit Malfunction (NE Signal) |
| U0100 | Lost Communication with ECM / PCM | - CAN communication system - Power management control ECU |
Refer to DTC U0100: Lost Communication with ECM / PCM |
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.