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 31 - Transaxle Temperature Cold (Circuit Open): Description
PCM supplies a 5 volt signal to transaxle temperature sensor. As transaxle temperature increases, sensor value should decrease. PCM monitors the voltage change on an internal circuit. If engine is running for at least 3 1/2 minutes, and PCM detects a transaxle temperature less than -35°F (-37°C), PCM will set code 31.
- This step checks if code 31 is still present. If "Scan" tool temperature reading is above -35°F (-37°C), problem is intermittent.
- This step duplicates conditions for code 32. If PCM does not set a code 32, go to next step. If PCM sets a code 32 and or "Scan" tool reads greater than 284°F (140°C), PCM and wiring are okay. If PCM and wiring are okay, replace sensor.
- This step also duplicates conditions for code 32. If PCM does not set code 32, Orange/Black wire is open or PCM is faulty. If Orange/Black wire is okay, replace PCM.
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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.