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.
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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 249 (ENGINE CONTROLS - SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P0300-P0308: ENGINE MISFIRE DETECTEDCONDITIONS FOR RUNNING DTC
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
Conditions For Running DTC
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Conditions For Running DTC
WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
- DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0121, P0122, P0123, P0125, P0128, P0218, P0335, P0336, P0340, P0341, P0385, P0386, P0502, P0503, P0713, P1114, P1115, P1121, P1122, P1258, P1372 are not set.
- The engine speed is between 500-5,850 RPM.
- The ignition voltage is between 9-18 volts. The engine coolant temperature (ECT) is between -7 and +120°C (+19 and +248°F).
- If the start-up ECT is below -7°C (19°F), then the test is delayed until the ECT is more than 21°C (70°F).
- The fuel level is more than 10 percent.
- The throttle position (TP) sensor angle is steady within 1 percent.
- The Anti-Lock Brake System (ABS) and the traction control system are not active.
- The transmission is not changing gears.
- The A/C clutch is not changing states.
- The PCM is not in fuel shut-off or decel fuel cut-off mode.
- The PCM is not receiving a rough road signal.
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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.