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.
DTC Inspection Priority: Notes
If multiple DTCs are displayed at the same time, perform inspections one by one based on the following priority table. See DTC INSPECTION PRIORITY table. If DTC U1000 and/or U1001 are displayed with other DTCs, first perform diagnosis for U1000 or U1001. See DTC U1000: CAN COMMUNICATION LINE & DTC U1001: CAN COMMUNICATION LINE .
| Priority | DTC |
|---|---|
| 1 | U1000/U1001, P0101/P0102/P0103 MAF Sensor, P0112/P0113/P0127 IAT Sensor, P0117/P0118/P0125 ECT Sensor, P0128 Thermostat Function, P0122/P0123/P0222/P0223/P0225/P0226/P0229/P2135 TP Sensor, P2122/P2123/P2127/P2128/P2138 Accelerator Pedal Position Sensor, P0181/P0182/P0183 Fuel Tank Temperature Sensor, P0327/P0328 Knock Sensor, P0335 Crankshaft Position Sensor, P0340/P0345 Camshaft Position Sensor, P0460/P0461/P0462/P0463 Fuel Level Sensor, P0500 Vehicle Speed Sensor, P0605 ECM, P0705 Park/Neutral Position Switch, P1610-P1615 NATS, P1706 Park/Neutral Position Switch |
| 2 | P0031/P0032/P0051/P0052 Heated Oxygen Sensor 1 Heater, P0037/P0038/P0057/P0058 Heated Oxygen Sensor 2 Heater, P0132/P0133/P0134/P0152/P0153/P0154/P1143/P1144/P1163/P1164 Heated Oxygen Sensor 1, P0138/P0139/P0158/P0159/P1146/P1147/P1166/P1167 Heated Oxygen Sensor 2, P0441 EVAP Control System Purge Flow Monitoring, P0444/P0445/P1444 EVAP Canister Purge Volume Control Solenoid Valve, P0447/P1446 EVAP Canister Vent Control Valve, P0452/P0453 EVAP Control System Pressure Sensor, P0550 Power Steering Pressure Sensor, P0710/P0720/P0725/P0740/P0744/P0745/P1705/P1716/P1730/P1752/P1754/P1757/P1759/P1762/P1764/P1767/P1769/P1772/P1774 A/T Related Sensors, Solenoid Valves & Switches, P1065 ECM Power Supply, P1111/P1136 Intake Valve Timing Control Solenoid Valve, P1122 Electric Throttle Control Function, P1124/P1126/P1128 Electric Throttle Control Actuator, P1217 Engine Over Temperature (OVERHEAT), P1805 Brake Switch |
| 3 | P0011/P0021 Intake Valve Timing Control, P0171/P0172/P0174/P0175 Fuel Injection System Function, P0300-P0306 Misfire, P0420/P0430 3-Way Catalyst Function, P0442/P0455/P0456 EVAP Control System, P0506/P0507 Idle Speed Control System, P1121 Electric Throttle Control Actuator, P1148/P1168 Closed Loop Control, P1211 TCS Control Unit, P1212 TCS Communication Line, P1564 ICC Steering Switch (ASCD Steering Switch), P1568 ICC Command Valve, P1572 ICC Brake Switch/ASCD Brake Switch, P1574 ICC Vehicle Speed Sensor/ASCD Vehicle Speed Sensor |
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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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