dec 19, 2016 · triggered a def warning, see dealer message. They tested, said it was bad def, and charged for the drain, clean and refill. I bought a tester right after that, and. oct 30, 2023 · i threw a p206a code. I have driven the truck 3 or 4 times since the check engine light came on. Every time i have also gotten the service def system, see. jan 16, 2022 · for example, if the tune turns off the def system, the cts3 can no longer read % def, the def command or the def tank level gauge. The tune on my 2016. 5 days ago · a common message is “service def system see dealer,” which can indicate issues such as an overfilled def tank or dirty def fluid. Check the def gauge regularly.
