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.
Conditions For Setting DTC
The PCM may detect a temperature difference between the ECT and the IAT of more than 36°F (20°C). If this happens, the vehicle must be driven for 5 minutes over 15 MPH. If the IAT decreases more than 12.6°F (7.0°C), a block heater is indicated and the test is aborted. If the IAT temperature does not decrease, a block heater was not detected and this DTC will set; or at the start up, the temperature difference between the ECT and the IAT is more than 252°F (140°C) and the cranking time for the engine without starting the engine is more than 10 seconds.
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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.