How to Check Engine Codes Without a Code Reader on a Chevy
1. Turn the ignition key to the on position without starting the engine.
2. Press and release the gas pedal 5 times within 5 seconds.
3. The check engine light will flash a series of codes.
4. Each code will be represented by a number of flashes.
5. The first digit of the code is the number of flashes followed by a pause, the second digit is the number of flashes followed by a longer pause, and so on.
6. For example, the code 1234 would be represented by 1 flash, a pause, 2 flashes, a pause, 3 flashes, a pause, and 4 flashes.