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.
2004 Toyota PriusFACTORY OEM SERVICE PROCEDURE
Transmission (Shift Control System) DTCS
AUTOMATIC TRANSMISSION DIAGNOSTIC TROUBLE CODES (DTC) IDENTIFICATION
| DTC | Description |
|---|---|
| C2300 | ACT SYSTEM MALFUNCTION |
| C2301 | SHIFT CHANGING TIME MALFUNCTION |
| C2303 | RELAY MALFUNCTION (+B SHORT) |
| C2304 | OPEN OR SHORT CIRCUIT IN U PHASE |
| C2305 | OPEN OR SHORT CIRCUIT IN V PHASE |
| C2306 | OPEN OR SHORT CIRCUIT IN W PHASE |
| C2307 | POWER SOURCE MALFUNCTION |
| C2310 | OPEN OR SHORT CIRCUIT IN BATT |
| C2311 | HV COMMUNICATION LINE MALFUNCTION |
| C2312 | POWER SOURCE CONTROL ECU COMMUNICATION LINE MALFUNCTION |
| C2315 | HV SYSTEM MALFUNCTION |
| C2318 | LOW VOLTAGE ERROR (POWER SUPPLY MALFUNCTION) |
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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