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 17: Pcm Fault (Pull-Up Resistor)
PCM uses a coolant sensor signal pull-up resistor to increase sensing accuracy throughout entire range of operating temperatures. When coolant temperature is less than 104°F (40°C), a 4-k/ohm resistor is used. When temperature is greater than 104°F (40°C), PCM switches to a 348-ohm resistor. If pull-up resistor does not switch, Code 17 will set. Code 17 is an internal PCM fault; PCM must be replaced.
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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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