A prevalent issue with the Hummer H1 is the P0446 code. This code corresponds to a specific number obtained when connecting your H1 to an OBDII scanner. A faulty vent control valve most commonly causes P0446. Definition P0446: EVAP System – Vent Control Circuit – Malfunction Symptoms Usually none Common Causes Bad EVAP Vent Control … Read more
One of the most common issues that happens with the Hummer H1 is the P0442 trouble code. This code appears when connecting the vehicle to an OBDII scanner and pertains to the emissions system. While it’s unlikely to cause a breakdown, it can be bothersome and may result in a failed emissions test for your … Read more
P0441 is one of the more common OBD II codes that can occur in the Hummer H1. It is frequently caused by a loose or bad gas cap, cracked or disconnected EVAP system hoses, vacuum leaks, or a bad purge valve. Always start by taking a look at the gas cap. P0441 is related to … Read more
This page is meant to help you troubleshoot the Hummer H1 P0430 trouble code. It covers the P0430 code’s meaning, symptoms, causes, and possible solutions. P0430 is an emissions-related trouble code and is virtually never a breakdown risk. P0430 is usually caused by a catalytic converter issue or a bad O2 sensor. Table of Contents … Read more
P0401 is a very common OBDII trouble code that’ll pop up in the Hummer H1. It has to do with the emissions system and stands for Exhaust Gas Recirculation (EGR)→ Insufficient Flow. The EGR system in your vehicle is responsible for recirculating exhaust gasses in order to lower the vehicle’s emissions output. There are three … Read more
P0302 in the Hummer H1 is a common OBD II trouble code. It indicates that your vehicle’s second cylinder has a misfire. P0302 is a real drivability concern and should be dealt with right away. If it’s bad enough to cause your H1’s check engine light to come on, you shouldn’t drive your vehicle at … Read more
P0011 is a common (and serious) OBD II diagnostic trouble code that can occur in the Hummer H1. It indicates an issue with your vehicle’s Variable Valve Timing (VVT) system. The first thing you should do when you have this code is check your H1’s oil. If the oil level is too low, the camshaft … Read more
P0010 is a relatively common trouble code. It affects vehicles with variable valve timing (VVT). The list of VVT vehicles is growing, and the Hummer H1 can have VVT and is prone to developing this code. P0010 is often by low or sludgy oil. Check your H1’s oil as soon as possible. P0010 is a … Read more
P0301 is a fairly common trouble code with the Hummer H1. It’s an OBD2 code and indicates that your vehicle’s first cylinder is misfiring. P0301 is certainly a cause for concern and should be considered a threat to the drivability of your H1. Fixing P0301 should be considered a high priority. Unlike a lot of … Read more
P0300 is a generic OBDII code that can occur with the Hummer H1. This code indicates that your vehicle’s engine is misfiring and can be a drivability threat. P0300 is often accompanied by cylinder-specific misfire codes (P030X, where the X indicates the cylinder number that is misfiring). If you have P0300 and a cylinder-specific misfire, … Read more