Android 2019 - P1682 Code, P0135 oxygen o2 sensor heater circuit malfunction, Description of vehicle trouble code p0135 - oxygen o2 sensor heater circuit malfunction (bank1, sensor1). Silveradosierra.com • electrical issues with nbs silverado, I have a 2007 new body silverado getting these codes p0230, p1682, u0101, u0109, u0121 and u0140. the truck has a really short crank cycle and when it does start it does not always shut off it will stay running with key turned off.. P0300 random misfire detected code - obd-codes.com, P0300 random misfire detected code technical description. random/multiple cylinder misfire detected. what does that mean? this diagnostic trouble code (dtc) is a generic powertrain code..