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.
Communication Error
When starting a diagnostic test or accessing Parameter Identification (PIDs) data, it is possible to receive a communication error from the scan tool. A communication error may be caused by operator error, vehicle wiring malfunction, connector problem, PCM malfunction, or other vehicle control modules. The scan tool may display a 2 digit number identifying a communication error code. The scan tool may also display a 2 digit code to a normal (valid) request (these codes require no action). If the scan tool displays an error code, check scan tool connections and verify proper entry of vehicle data. Follow equipment manufacturers instructions to remedy an error code.
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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.