Check Engine Light Not On But Codes Found

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.

Check engine light not on but codes found.

If your check engine light is on but no code it s your scan tool not the vehicle. Clearing any codes present will turn off your check engine light temporarily. One main reason that a check engine light comes on with no code being stored is that there is a software error. In that case you could scan the computer and find a code even though the light wasn t on.

This is often the result of something being wrong with the obd reader that the driver parts store or mechanic shop is using. 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. There are other cases where there s no check engine light but codes. The same is true if you have abs light on tcs light on vsc light on etc.

Press the erase clear button on your scanner then turn off the key and disconnect it. If the check engine light is on you ve got a trouble code stored. You ve only got two choices at this point. For example any problem that affects the emissions system will automatically light the check engine light.

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

Everything in the obdii code list is in some way related to emissions.