If the Light Is On Steady
You may be able to correct the emission system malfunction by considering the following:
Did you recently put fuel into your vehicle? If so, reinstall the fuel cap, making sure to fully install the cap.
The diagnostic system can determine if the fuel cap has been left off or improperly installed.
A loose or missing fuel cap will allow fuel to evaporate into the atmosphere. A few driving trips with the cap properly installed should turn the light off.
Did you just drive through a deep puddle of water? If so, your electrical system may be wet. The condition will usually be corrected when the electrical system dries out. A few driving trips should turn the light off.
Have you recently changed brands of fuel? If so, be sure to fuel your vehicle with quality fuel.
Poor fuel quality will cause your engine not to run as efficiently as designed. You may notice this as stalling after start-up, stalling when you put the vehicle into gear, misfiring, hesitation on acceleration, or stumbling on acceleration.
(These conditions may go away once the engine is warmed up.) This will be detected by the system and cause the light to turn on.
If you experience one or more of these conditions, change the fuel brand you use. It will require at least one full tank of the proper fuel to turn the light off.
If none of the above steps have made the light turn off, your dealer can check the vehicle.
Your dealer has the proper test equipment and diagnostic tools to fix any mechanical or electrical problems that may have developed.
See also:
TPMS Sensor Identification Codes
Each TPMS sensor has a unique identification
code. Any time you replace one or more of
the TPMS sensors or rotate the vehicle’s tires, the
identification codes will need to be matched to
the new ...
Current and Past Models
Technical Service Bulletins and
Manuals are available for current
and past model GM vehicles.
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1-800-551-4123 Monday – Friday
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How to Check Automatic Transmission
Fluid (4.6L Engine)
For the 4.6L V8 engine, it is not necessary to check the
transmission fluid level. A transmission fluid leak is
the only reason for fluid loss. If a leak occurs, take the
vehicle to your dealer/ ...
