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It would be a good idea to check the exhaust for leaks first. Specifically it’ll usually be the O2 sensor(s) on the downstream side of the catalytic converter.īut, don’t be surprised if it’s not. Often, the oxygen sensor is the cause of P0430. When the fuel mixture is rich, the exhaust the O2 sensors see will be out of range and it could throw the sensor. Engine Temp Sensor– If the computer doesn’t know what the engine temp is it’ll keep the fuel mixture rich.Exhaust Leak– If there’s a noticeable exhaust leak coming from the vehicle it can change what the O2 sensors register enough to throw the P0430 code.
HOW TO FIX 2009 GMC SIERRA POC32 CODE CODE
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It doesn’t matter which model you have, this OBDII code has the same meaning for all of them (1996 models and newer). This code number references a number that is given to you when you plug your GMC Sierra into a OBDII scanner.
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One of the most common trouble codes with all GMC vehicles is the P0430. P0430: Catalyst System Efficiency → Below Threshold → Bank 2 In the Sierra, OBDII P0430 is often caused by a bad oxygen sensor, but there can be other causes as well. This page is meant to help you troubleshoot the GMC Sierra P0430 trouble code.