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 MANUALSBUICK2006ALLURE CXSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 1 (ENGINE CONTROL SYSTEM - 3.8L - INTRODUCTION (2 OF 2))DESCRIPTION AND OPERATIONTHROTTLE ACTUATOR CONTROL (TAC) SYSTEM DESCRIPTIONMODES OF OPERATIONREDUCED ENGINE POWER MODE
2006 Buick Allure CXS
Reduced Engine Power Mode
2006 Buick Allure CXSSECTION Reduced Engine Power Mode
WARNING: This page is about a different variant/trim than selected.
When the PCM detects a condition with the TAC system, the PCM may enter a reduced engine power mode. Reduced engine power may cause one or more of the following conditions:
- Acceleration limiting-The PCM will continue to use the accelerator pedal for throttle control, however the vehicle acceleration is limited.
- Limited throttle mode-The PCM will continue to use the accelerator pedal for throttle control however the maximum throttle opening is limited.
- Throttle default mode-The PCM will turn off the throttle actuator motor and the throttle will return to the spring loaded default position.
- Forced idle mode-The PCM will perform the following actions:
- Limit engine speed to idle by positioning the throttle or by controlling the fuel and spark if the throttle is turned off.
- Ignore the accelerator pedal input.
- Engine shutdown mode-The PCM will disable fuel and de-energize the throttle actuator.
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.