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.
Diagnostic Aids
Engine will not start if a total malfunction of Class 2 serial data circuit occurs when engine is not running. If total malfunction of Class 2 serial data circuit occurs while engine is running, PCM will operate in fail-enable mode and allow continued operation of vehicle. A short to ground/voltage or an internal module fault that shorts Class 2 data line to ground or voltage will cause a failure of all Class 2 communication. Modules are connected to Class 2 serial data circuit in a looped series, so an open in Class 2 serial data circuit between two modules will not cause a total malfunction of Class 2 serial data circuit.
NO RELATED
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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.