Diagnostic Aids

2004 Oldsmobile Bravada RWDSECTION Diagnostic Aids
WARNING: This page is about a different car, the 2003 GMC Sonoma and 2003 Chevrolet S10 Pickup. However, it is still accessible from the selected car via links, so may be relevant.

A small amount of resistance in the battery positive voltage to the PCM may cause a no-start. The PCM grounds will cause a no-start only if none of them are making a good connection. A loose CKP sensor may cause an intermittent no-start by moving away from the reluctor wheel.

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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.