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.
Hard Trouble Code F11: Notes
The A/C high side temperature sensor uses a thermistor to control signal voltage to BCM. The BCM applies voltage on circuit No. 732 to sensor. When sensor is cold, its resistance is high; therefore, BCM will see a high signal voltage. As sensor warms, its resistance becomes less and signal voltage is pulled low through sensor ground, circuit No. 736. This signal voltage will vary between 5 volts (open circuit) and 0 volts (shorted circuit).
Code will set if signal voltage indicates less than B9°C (open circuit) or over 209°C (shorted circuit). These conditions can be observed in BCM data display (parameter "P.2.7") as a reading outside the range of B9°C to 209°C.
- If shorted circuit reading changes to an open circuit reading after disconnecting sensor, BCM and wiring are okay.
- If open circuit reading changes to shorted circuit reading after jumpering sensor terminals, BCM and wiring are okay.
- By applying ground to various points in circuits, an open can be isolated by observing whether parameter display can be changed from open reading to shorted reading.
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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.