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Websep 7, 2024 · how to fix p11db gmc. Use a diagnostic scanner to retrieve the specific trouble code and identify the faulty nox sensor on bank 1 sensor 1. Webif you see the engine light or service engine soon warning light on, the fault code p11db could be the culprit. This code is often caused by a faulty nitrogen oxides (nox) sensor,. Webaug 25, 2024 · when your gmc or chevrolet duramax diesel engine throws a p11db code, it’s a clear sign something’s wrong with the nox sensor. The good news is that. Webaug 18, 2024 · the p11db code for chevrolet refers to an issue with the nox (nitrogen oxide) sensor's current performance in bank 1, sensor 1. This sensor is responsible for.