Where are the trouble codes on a GM?
The computer uses the “Check Engine” light located on your dashboard to display the stored trouble codes. When placing the computer in diagnostic mode, the “Check Engine” light will flash in numbered sequences that represent specific trouble codes. Turn off your GM’s engine.
What does code 12 mean on GM OBD?
The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the “CHECK ENGINE”, “SERVICE ENGINE SOON” or “MALFUNCTION INDICATOR LAMP” or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession.
How to read code without scan tool on 1994 GM?
Insert the pointed ends into the furthest two top-right diagnostic connector terminals. After bridging the two top right terminal connections on the diagnostic connector, switch the ignition to the “ON” position. Watch the “Check Engine” light on your dashboard. It should flash once, pause, and flash two more times in succession.
How to read a GM check engine light code?
It will look like Morse Code, but it isn’t, and is real easy to interpret. The first code that will flash will be a code 12. It will be “flash, pause, flash, flash, pause, pause,” and repeat the cycle three times. The ECMwill flash each code three times, and move on to the next. If you have no codes stored, it will keep flashing code 12.
How to read GM trouble codes without a scan tool?
Turn off the ignition switch. Remove the paper clip from the diagnostic connector. Translate the number of flashes for each sequence into the appropriate two-digit GM trouble code. For example; if one flash sequence flashes three times, pauses and then flashes four times, the sequence would be considered trouble code “34.”
The system will enter the diagnostic mode. In this mode, the computer will display a Code 12, three consecutive times, by flashing the “CHECK ENGINE”, “SERVICE ENGINE SOON” or “MALFUNCTION INDICATOR LAMP” or light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession.
What does GMC OBDII OBD2 code scanner do?
GMC OBDII Readers OBD2 Code Tool Scanner. With the new GMC OBD reader system, your vehicles are now in a safe control trend which is specifically meant for very important transmission tasks. Once you have the connection system installed for your vehicle, all your minor and major problems can be detected as soon as they appear.
It will look like Morse Code, but it isn’t, and is real easy to interpret. The first code that will flash will be a code 12. It will be “flash, pause, flash, flash, pause, pause,” and repeat the cycle three times. The ECMwill flash each code three times, and move on to the next. If you have no codes stored, it will keep flashing code 12.