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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 2 (ENGINE CONTROL SYSTEM - SELF-DIAGNOSTICS - 5.3L)DIAGNOSTIC TESTSDTC P0300-P0308: ENGINE MISFIRE DETECTEDCONDITIONS FOR RUNNING DTC
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Conditions For Running DTC

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Conditions For Running DTC
WARNING: This page is about a different variant/trim than selected.
  • DTCs P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0125, P0128, P0220, P0315, P0335, P0336, P0341, P0342, P0343, P0502, P0503, P1114, P1115, P1120, or P1258 are not set.
  • The engine speed is between 450-5000 RPM.
  • The ignition voltage is between 10-18 volts.
  • The Engine Coolant Temperature (ECT) is between 19-266°F (-7-130°C).
  • 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 (DFCO) mode.
  • The PCM is not receiving a rough road signal.
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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.