How can I tell if my engine speed sensor is bad?
If your car has some engine speed sensor problems, the Powertrain Control Module (PCM) will set a diagnostic trouble code and illuminate the Check Engine Light on the vehicle dashboard. Then the check engine light comes on sporadically and intermittently when accelerating. The overdrive light also may go ‘On’ or ‘Off’ for no apparent reason.
What does the Check Engine light come on?
Check Engine Light comes on The transmission speed sensors are used to calculate the actual gear ratio of the transmission while in use. There are generally two speed sensors that work in conjunction to provide accurate data to the vehicle’s onboard computer. The first transmission speed sensor is known as the Input Shaft Speed (ISS) sensor.
Can a faulty speed sensor cause driveability problems?
Driveability symptoms caused by a faulty sensor can vary greatly due to the number of tasks the sensor output is involved in. Most vehicle computers will set related check engine light codes for vehicle speed sensors that malfuction. But what if there are no codes? What should we look for?
What happens when the transmission speed sensor is lost?
If the signals are lost from the transmission speed sensors, the PCM will set a DTC and illuminate the Check Engine Light on the vehicle dashboard. It also can indicate that there is an increase in tailpipe emissions that surpasses acceptable limits for environmental contaminants from motor vehicles.
Driveability symptoms caused by a faulty sensor can vary greatly due to the number of tasks the sensor output is involved in. Most vehicle computers will set related check engine light codes for vehicle speed sensors that malfuction. But what if there are no codes? What should we look for?
Why is my Check Engine light not working?
A ‘check engine’ light is a serious issue on its own and must be checked immediately. In cases where the speedometer does not settle on any particular reading but keeps moving between speeds, it is almost always due to bad wiring, in case of a cable system, or a faulty speed sensor.
What are the symptoms of a bad engine speed sensor?
However, here is a list of the most common symptoms associated with a bad engine speed sensor: Transmission revs higher before it changes gears. The car’s transmission engages into overdrive late and sometimes will never go into that top gear. Brakes are sometimes harder than normal when coasting.
If the signals are lost from the transmission speed sensors, the PCM will set a DTC and illuminate the Check Engine Light on the vehicle dashboard. It also can indicate an increase in tailpipe emissions surpassing acceptable limits for environmental contaminants from motor vehicles.