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 12, 13 - Rpm Signal
Code 12 is caused by loss of "G" or "NE" signal from distributor to ECU for at least 2 seconds after starter signal is received at ECU. Check distributor and ignition system components. See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section. Ensure starter signal exists at ECU. See TEST NO. 9 or CODE 43.
Code 13 is caused by loss of "NE" signal from distributor to ECU when engine RPM exceeds 1000 RPM. Check distributor and ignition system components. See See I - SYS/COMP TESTS article in the ENGINE PERFORMANCE Section.
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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.
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