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.
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HOMESERVICE MANUALSBUICK2005LESABRE LIMITED, 4T65E/M15REPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - INTRODUCTIONDESCRIPTION AND OPERATIONFUEL SYSTEM DESCRIPTIONFUEL CUTOFF MODE
2005 Buick LeSabre Limited, 4T65E/M15
Fuel Cutoff Mode
2005 Buick LeSabre Limited, 4T65E/M15SECTION Fuel Cutoff Mode
The PCM cuts-off fuel from the fuel injectors when the following conditions are met in order to protect the powertrain from damage and improve driveability:
- The ignition is OFF. This prevents engine run-on.
- The ignition is ON but there is no ignition reference signal. This prevents flooding or backfiring.
- The engine speed is too high, above red line.
- The vehicle speed is too high, above rated tire speed.
- During an extended, high speed, closed throttle coast down. This reduces emissions and increases engine braking.
- During extended deceleration, in order to protect the catalytic converters.
RENDER: 1.0x
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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.