Check Engine Light Not On But Codes Found

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

Check engine light not on but codes found.

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. Most frequently the software errors stem from a low level obd reader being used. Clearing any codes present will turn off your check engine light temporarily. After pressing erase clear and waiting until you see a no codes message you can turn off your vehicle and disconnect the scanner.

Press the erase clear button on your scanner then turn off the key and disconnect it. 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. The same is true if you have abs light on tcs light on vsc light on etc. I d guess that something happened which triggered the light but the condition didn t persist.

So no codes when it was scanned. In that case you could scan the computer and find a code even though the light wasn t on. There are other cases where there s no check engine light but codes. You ve only got two choices at this point.

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. For example any problem that affects the emissions system will automatically light the check engine light. If your check engine light is on but no code it s your scan tool not the vehicle. If the check engine light is on you ve got a trouble code stored.

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.