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.
Testing Procedure
To ensure correct diagnosis and repair, testing should be done in the following order:
- Get information about conditions present when malfunction occurred. Retrieve and record DTCs and freeze-frame data. See RETRIEVING DIAGNOSTIC TROUBLE CODES . If MIL is on, and DTCs are not accessible, check for ECM fail-safe mode. See FAIL-SAFE MODES . If symptoms exist, but DTCs or freeze-frame data do not exist, go to next step. If symptoms do not exist, but DTCs or freeze-frame data exist, go to step 3.
- Attempt to duplicate conditions present when malfunction occurred. If malfunction is detected, perform basic inspection. See ON-VEHICLE ADJUSTMENTS article. Then go to diagnosis by SYMPTOMS in TROUBLESHOOTING - NO CODES article. If malfunction can not be verified, problem may be intermittent. See INTERMITTENTS in TROUBLESHOOTING - NO CODES article.
- Clear DTCs and freeze-frame data. See CLEARING DIAGNOSTIC TROUBLE CODES . Attempt to reset DTC by performing DTC CONFIRMATION TEST in appropriate DTC diagnostic test. If multiple DTCs are present, diagnose in order of priority. See MULTIPLE DTC PRIORITY IDENTIFICATION . If DTC does not reset, problem may be intermittent. See INTERMITTENTS in TROUBLESHOOTING - NO CODES article. If DTC resets, go to next step.
- Perform appropriate diagnostic procedure. See appropriate test under DIAGNOSTIC TESTS. After repairs are made, perform appropriate DTC CONFIRMATION TEST to verify repair. Clear DTCs. If SRT codes are not set, drive vehicle in specified driving pattern to set all SRT codes. See SYSTEM READINESS TEST .
| Priority | DTC | ||
|---|---|---|---|
| 1 | P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0128, P0181, P0182, P0183, P0221, P0222, P0223, P0226, P0227, P0228, P0327, P0328, P0335, P0340, P0460, P0461, P0462, P0463, P0464, P0500, P0605, P1223, P1224, P1225, P1226, P1227, P1228, P1229, P1464, P1706, U1000 & U1001 | ||
| 2 | P0031, P0032, P0037, P0038, P0132, P0133, P0134, P0138, P0139, P0217, P0441, P0444, P0445, P0447, P0452, P0453, P0506, P0507, P0650, P0710, P0720, P0725, P0740, P0750, P1065, P1111, P1122, P1124, P1126, P1143, P1144, P1146, P1147, P1444, P1446, P1448, P1490, P1491, P1705, P1760 & P1805 | ||
| 3 | P0011, P0171, P0172, P0300, P0301, P0302, P0303, P0304, P0420, P0442, P0455, P0456, P0705-P0725, P0740-P0755, P1121, P1148, P1217, P1456, P1564, P1572 & P1574 | ||
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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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