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.
Diagnostic Test
- ACTIVE DTC
- Ignition on, engine not running.NOTE:
If this code sets during extreme ambient temperatures, improper installation of a block heater may cause this DTC to set.
- With the scan tool, select View DTCs.
- Diagnose all other ECT and Cooling System codes before continuing.
Is the DTC Active at this time?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
- Ignition on, engine not running.
- LOW COOLANT LEVEL NOTE:
If an Engine Coolant Temperature (ECT) DTC is set along with this code, diagnose the ECT DTC first.
NO RELATED
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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.