What does error code 355 mean on a Bully Dog GT Tuner when being used on a GM Gas vehicle?
This means that the tuner was unable to unlock the PCM.
Make sure the key is all the way to the on/run position, without starting the engine. Some special edition vehicles such as the Rocky Ridge vehicles will get this code. Our tuners are not compatible with some of these special edition trucks.
If the issue persists, please contact our Technical Support Team.
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