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A group of tell-tales showing lights for "brake fluid", "stop lamp" and "check engine" Graphical tell-talesA tell-tale, sometimes called an idiot light [1] or warning light, is an indicator of malfunction or operation of a system, indicated by a binary (on/off) illuminated light, symbol or text legend.
A check engine light or malfunction indicator lamp (MIL), is a tell-tale that a computerized engine-management system used to indicate a malfunction or problem with the vehicle ranging from minor (such as a loose gas cap) to serious (worn spark plugs, engine problems or a faulty oil valve, etc.).
It is able to do this by flashing a check engine light on the car's instrument panel and storing the information about a malfunction in its memory. When taken to a service center, the ECM uses this same light to "talk" to the mechanic through a flashing code that indicates where the problem is. On Cadillacs, the proper code is digitally displayed.
The dashboard will have two versions, one similar to the Tahoe while a different one with a larger entertainment screen will be exclusive to the Denali. The Yukon's design follows GMC's design language, with the front grille mimicking the Sierra but the tailgate mimicking the GMC SUV lineup with the lights extended to the tailgate doors.
When one of these errors occurs, usually it will turn on the "check engine" light on the dashboard. The PCM is one of potentially several on-board computers, or essentially the "brain" of the engine control system.
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This system uses a flashing dashboard icon and emits an audible warning when a white lane marking is being crossed, and emits a louder audible warning when a yellow-line marking is crossed. This system is canceled when a turn signal is operating, or by pressing a deactivation switch on the dashboard; it works by using an optical sensor on both ...
Typical dashboard icon indicating that high beams are illuminated. Headlight flashing is the act of either briefly switching on the headlights of a car, or of momentarily switching between a headlight's high beams and low beams, in an effort to communicate with another driver or drivers.
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related to: gmc dashboard warning lights meaning