Warning Light on the Dash. What Does it Mean?

Today's cars and trucks have many lights that can come on the dash to warn the driver of a problem in a particular system. Many times when multiple lights are on, these can be related to the same problem.

Computers "TALK" to each other. So, a problem in one system can affect one or more other systems. Sometimes this will cause a system to be dissabled and the warning light to come on, even though that system does not have a probem.

A good example of this is that a problem in the ABS will usually cause the Traction Control to be dissabled. You may have an indicator that shows "TRAC Off". That does not neccesarily mean there is a fault in the Traction control function.

Does your car or truck have a warning light or indicator on the dash. Find out what these lights mean, what to do next, possible causes and solutions.

The vehicle stability enhancement system (VSES) provides added stability during aggressive maneuvers. Yaw rate is the rate of rotation about the vehicle's vertical axis. The system is activated when the electronic brake control module (EBCM) determines that the desired yaw rate does not match the actual yaw rate as measured by the yaw rate sensor.

The supplemental inflatable restraint (SIR) system supplements the protection offered by the occupant seat belt system. The SIR system has several inflater modules located throughout the vehicle, i.e. The inflatable restraint steering wheel module, inflatable restraint IP module in passenger side of dash,

The anti-lock braking system (ABS) uses several sensors, motors, and a computer in conjunction with the normal braking system.

The ABS regulates the brake pressure in order to reduce wheel lock-ups. Reduced wheel lock-ups improve the driver's control of the vehicle during braking.

Theft / Security Light

The security system on today's cars and trucks prevents the vehicle from being stolen. There are many variations of the system going back to the early 1990's.

The tire pressure monitor system in today's cars use a radio frequency (RF) transmitter ( Tire Pressure Sensor ) in each wheel valve stem to relay pressure information to the module. The Service Tire Pressure Monitor System light / warning means there is a problem in the system, not a low tire.

Today's cars and trucks use many sensor, switches, solenoids, and other electrical components to control or monitor every aspect of the engine.From controlling the fuel and ignition systems, to monitoring the emissions. A problem in any of these systems, or subsystems, can cause the check engine light to come on.

The dash, also know as the instrument cluster, or IPC, illuminates the SERVICE VEHICLE SOON indicator light when the following things occur:

The body control module (BCM) detects certain malfunctions in the lighting system.

The IPC receives a class 2 message from the BCM requesting illumination.

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How Things Work

How Does the Keyless Entry System Work?

The remote keyless entry system performs the following functions:

Locking the vehicle doors
Unlocking the vehicle doors
Opening the rear compartment lid

The keyless entry system is equipped with an alarm feature that performs the following functions:

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Common Engine Codes

Code P0171 Fuel Trim Error

The powertrain control module (PCM) controls the air/fuel metering system in order to provide the best possible combination of driveability, fuel economy and emission control. Fuel delivery is controlled differently during Open and Closed Loop. During Open Loop, the PCM determines fuel delivery based on sensor signals, without oxygen sensor (O2S) input.

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