Q: Check Engine light comes on and goes off

asked by on

The light in the speedometer red needle is not working. Also, the Check Engine light comes on and goes off.

If the speedometer is not working but the rest of the instrument cluster is, the issue is probably the vehicle speed sensor. This sensor is the main input to the control module for speedometer control. The problem could also be with the wiring or the speedometer itself. There are hundreds of reasons the Check Engine Light might be on. The powertrain control module (PCM) takes inputs from dozens of sensors. It then uses this information to control outputs such as fuel delivery and emissions equipment. If the PCM detects a problem anywhere in the system it will illuminate the Check Engine Light. A failed vehicle speed sensor could cause both of the problems you are having. A trained professional, such as one from YourMechanic, will be able to inspect your vehicle’s speedometer issue and Check Engine Light to give you a definitive answer for what repairs are needed.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Check Engine light comes on and goes off

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Volvo s40key was stuck won't crank clicking from fuse box

It may be that you have low system voltage. That might be because of a dead battery, or it might be because of an interruption in the power distribution. But since everything is computer controlled these days, if the system...

Q: Vibration and noise experienced at the front left wheel.

Hi there. The vibration could be the wheel hub assembly worn or the CV Shaft moving around. The wheel is attached to a wheel hub assembly which is attached to the steering suspension on the car, so the wheel will...

Q: My battery went dead, replaced it with a new one and within 150 miles the Check Engine Warning Light came on.

There are a relatively large number of Technical Service Bulletins that GM has issued covering faults and difficulties with electrical components in your vehicle (ref: National Highway Traffic Safety Administration on-line database which we searched for your year, make and...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...