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.
2011 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Diagnostic Trouble Code Chart
HINT:
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 "See" below.
POWER MANAGEMENT CONTROL ECU
| DTC Code | Detection Item | Trouble Area | See |
|---|---|---|---|
| B2271 | Ignition Hold Monitor Malfunction | 1. AM2 fuse 2. IG1 relays 3. IG2 relay 4. Power management control ECU 5. Instrument panel junction block assembly 6. Wire harness or connector |
Refer to DTC B2271: Ignition Hold Monitor Malfunction |
| B2274 | ACC Monitor Malfunction | 1. AM2 fuse 2. ACC relay 3. Power management control ECU 4. Instrument panel junction block assembly 5. Wire harness or connector |
Refer to DTC B2274: ACC Monitor Malfunction |
| B2275 | STSW Monitor Malfunction | 1. AM2 fuse 2. Power management Control ECU 3. Wire harness or connector |
Refer to DTC B2275: STSW Monitor Malfunction |
| B2277 | Detecting Vehicle Submersion | Power management control ECU | Refer to DTC B2277: Detecting Vehicle Submersion |
| B2282 | Vehicle Speed Signal Malfunction | 1. CAN communication system 2. Combination meter system 3. Power management control ECU 4. Wire harness or connector |
Refer to DTC B2282: Vehicle Speed Signal Malfunction |
| B2284 | Brake Signal Malfunction | 1. STOP fuse 2. Stop light switch assembly 3. CAN communication system 4. Skid control ECU assembly 5. Power management control ECU 6. Wire harness or connector |
Refer to DTC B2284: Brake Signal Malfunction |
| B2286 | Runnable Signal Malfunction | 1. AM2 fuse 2. Power management control ECU 3. Wire harness or connector |
Refer to DTC B2286: Runnable Signal Malfunction |
| U0293 | Lost Communication with HV ECU | Power management control ECU | Refer to DTC U0293: Lost Communication with HV ECU |
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.