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.
Code P012, No 4X Reference Signal From IGN Control Module: Notes
PCM checks for cam pulses being received without 4X reference pulses. If PCM senses no reference pulses, engine will not start because fuel delivery system is triggered by pulses and Code P012 is set.
Engine will start and run after an extended crank with Code P012 set. This is because the 24X reference pulses are being received by PCM. PCM uses this signal for fuel control instead.
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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.