Check Engine Light Not On But Codes Found

After pressing erase clear and waiting until you see a no codes message you can turn off your vehicle and disconnect the scanner.

Check engine light not on but codes found.

So no codes when it was scanned. Press the erase clear button on your scanner then turn off the key and disconnect it. Buy a scan tool that can read enhanced as well as b c and u codes or pay a shop to read the codes for you. If your check engine light is on but no code it s your scan tool not the vehicle.

One main reason that a check engine light comes on with no code being stored is that there is a software error. You ve only got two choices at this point. In that case you could scan the computer and find a code even though the light wasn t on. I d guess that something happened which triggered the light but the condition didn t persist.

For example any problem that affects the emissions system will automatically light the check engine light. Clearing any codes present will turn off your check engine light temporarily. However all error codes are stored so you can look at historical data even with a 10 bluetooth obdii dongle and see what the code was before. If the check engine light is on you ve got a trouble code stored.

This is often the result of something being wrong with the obd reader that the driver parts store or mechanic shop is using. Most frequently the software errors stem from a low level obd reader being used. There are other cases where there s no check engine light but codes. Disconnect that circuit from the ecu if the light goes off probably an issue with the ecu if the light stays on look for a short to power on that circuit.

But if the problem is not emissions related and also not critical it may be stored in the computer but not light the check engine light.