Service engine soon Light Turned OFF after Jump Start?

The reason the light went out after the jump start, is because when the system loses battery voltage, the "clears" the trouble codes from the on-board computer. Once the computer "re-boots" itself, and re-checks all the systems, it will see the fault again, and re-set the Check Engine light. So, it's the same problem, it just took the on-board computer a little bit to re-evaluate the problem after the power loss.


Actually, When the Check Engine light comes on or Service engine soon light comes up, this is the Engine ECM way of telling you there is a problem in one of the monitored systems. Unfortunately, there are literally number of parts and sensors monitored in various systems, and to take a "guess" as to which part/sensor in which system is faulty, is virtually impossible.

However, if you are not experiencing any drivability issues such as skipping, stalling, shifting problems, etc, then more than likely, the problem is going to lie in the EVAP (emissions) system.

Very commonly in many such cases, this could be a faulty, loose or missing fuel cap or even putting fuel in while the vehicle is running.
So to test/inspect the problem

• Check the cap for any cracks in the rubber o-ring on the underside.
• Check the fuel filler neck for any signs of chips or debris. 
• Check under the vehicle, around the area of the fuel tank and the EVAP canister looking for any vacuum lines that have dry-rot cracks, holes or loose/missing connections. 

If these all check out, then the best thing to do at this point is to have the "p-codes" read from the on-board computer. There are 4 digit P codes stored in vehicles computer.
These p-codes are what is used as a "starting point" for the diagnosis and will tell which part/sensor in which system has the fault.
There isn't a Mechanic on the planet that can tell you what is wrong with the vehicle just by "looking" at the Engine Light. Every single Mechanic's first course of action WILL be to obtain the p-codes. Once you get these p-codes you can more accurately and efficiently diagnose the problem and then make the repair. You can have these p-codes read FREE (except in California) at any local "big chain" part store (ie. AutoZone, PepBoys, Advanced, etc).

Once you receive the P-codes,you can troubleshoot the problem further with help of this P-codes.

This details will help.
Thanks.

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ABS and VTM-4 Warning Lights ON Dash?

While driving the Warning lights come up on dash.
The vehicle runs fine but this warning lights are coming up.

The maintenance Required light,the ABS light,The VTM-4 warning light.

In your vehicle is driving fine with no issues at all and you just notice this warning lights coming up.Then its not to worrier.
Many a times this lights comes up when vehicle gets driven on bumpy roads or after the vehicle gets jumped on a road bump.This jerks the internal cars system and this lights just comes up.


most of the time this is simply due to the rear wheels spinning at different rates of speed due to the bumpiness of the road causing one to lose total traction with the ground. The left and right rear speed sensors record the different rates of speed and turn both warning lights on as they set fault codes.

You can disconnect your battery for 10 minutes to reset the computer and turn off the warning lights, but make sure you have your 5 digit anti-theft radio code to input into the radio as disconnecting the battery will lock it.

If the warning lights again come back on, then you will need to have the ABS control module scanned for fault codes and go from there.

As to the maintenance required light coming on the going off, this could be a loose connection behind the dash for the light, but will need to be scanned for fault codes to diagnose.

This details will help.
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Wrench Light and Emission Light ON Dash?

Warning light with Wrench indicator is ON.Also Emission control warning light is ON.

Basically this illuminate when there is error code stored in vehicles computer,
To know what the exact problem is or what is the reason for this lights to come up ON dash.The Computer needs to be scanned by OBD scan tool.


Mostly the check engine light only comes on when the onboard computer detects a fault in either the engine management system, transmission, or emission control system. Faults can range from vacuum leak, engine misfire, transmission problem, emission control leak, one of dozens of engine or transmission sensors, or even internal engine or transmission failure.
There are over 800 fault codes that can cause the check engine light to come on.
And not every one has symptoms you can feel or see or hear.

The only way to determine which of the over 800 faults is responsible is to have the onboard computer read with a diagnostic scanner. once this is done and the fault code retreived then pinpoint diagnosis can be done and repair done.

Because the emission light is also on, this narrows it down to about 150-200 fault codes, which is still too many for anyone to guess at.

You can try tightening your gas cap and see if the lights go off. If they do not, then you will absolutely need to have the onboard computer scanned for fault codes in order to know the area of concern and proceed from there.

This details will help.
Thanks.

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2005 Toyota Prius: Hybrid warning Light ON?

This is indication of System stored error codes.To confirm what the problem is retrieve the error codes.

This could mean anything from a engine control system malfunction to a malfunction in the hybrid control system. Without knowing the code numbers it is difficult to say for certain.
Try this basic reset procedure:----
Pull over to a safe spot and shut the system off. Wait for 5 min. then power the system backup does the ready light come on with the warning lights turned off? If they are still on try powering down the system one more time and restarting. At that point depress the accelerator pedal all the way to the floor for about 2 seconds to confirm whether the engine will start and run. If the engine will not start run,then you will eventually run the hybrid battery down and will need to be towed. If you go past a nearby AutoZone or similar parts store in most states they do free engine code reads. They will be able to access malfunction codes in the engine control computer but not the hybrid system. The engine control computer may give you enough information to troubleshoot further. Provided the gasoline engine continues to run and start up should be able to drive this another 25 miles or so.

This details will help.
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All control panel warning Lights are steady ON?

While driving all warning lights came up on dash and will not turn OFF.

The VSC, track off, Check Engine, ABS, Brake warning lights are Steady ON.

In this case first try the reset procedure on your vehicle.

REMOVE THE NEGATIVE CABLE AND RESET THE COMPUTER BY TURNING THE IGNITION KEY ON AND OFF FIVE TIME.

Now see if the same lights are still steady ON, or all is well.

But if the problem is still the same then further test are to be done.
Whenever the check engine light comes on there will be a malfunction code stored in the engine control computer. By default the vehicle skid control light and track off light will come on. If the vehicle is otherwise running normally 90% of the time it ends up being some type of emissions failure either due to a loose gas cap or something in the evaporative emissions control system. In most states auto-parts stores like AutoZone and similar do free malfunction code reads. If you can get to one of these parts stores and get the engine control computer malfunction code.Once you have the code,it will tell you what parts is causing this all lights to come on dash.

So as per that you can do further testing and repairs.

This details will help.
Thanks.

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