P2187 is a DTC code that can occur in the Hummer H1. It indicates the air fuel mixture is too lean at idle. The technical definition for P2187 “System Too Lean at Idle: Bank 1”. The code is thrown after your H1’s oxygen sensor on Bank 1 (usually sensor 1) has detected that the air … Read more
There are a few reasons why your Hummer H1 would be overheating when idling. The most common ones include a bad thermostat, water pump, electric fans, and low coolant level. This guide is intended to help you find the cause of this overheating in the most efficient way possible. So, let’s start with what’s easy … Read more
P0068 in the Hummer H1 is a generic OBD II code. In layman’s terms, it means that the MAP (manifold absolute pressure) and/or MAF (mass airflow sensor) are providing the H1’s computer contradicting data compared to what it should be in relation to the throttle position sensor. The throttle position sensor tells the computer how … Read more
A smoking engine is a serious thing. If your Hummer H1’s engine has smoke coming from it, it needs to be addressed right away. It can be caused by quite a few different problems, none of which should be ignored. The most common reasons why your H1’s engine would smoke include overheating, burning oil, or … Read more
While it may not leave you stranded, a vehicle that hesitates to start can be very concerning. There are a few reasons why your Hummer H1 may not be starting, such as a bad starter, a bad battery, bad alternator, and more. Hummer H1 Hesitates to Start: Causes Here are some of the most … Read more
Sway bar links are responsible for connecting your Hummer H1’s sway bar to the chassis. The job of a sway bar is to eliminate body roll by helping the tires keep better contact with the road, which improves the handling characteristics of your H1. If you have a bad sway bar link, your vehicle will … Read more
If your Hummer H1 is shutting down while driving, it’s a real safety hazard. Vehicles are a lot harder to control without power brakes or steering. Below is a list of the most common reasons your H1 would randomly die while driving. Before looking at anything, is the check engine light on? If it is, … Read more
Brake lights are one of the most critical safety features that your Hummer H1 has. They let other drivers know when you are slowing down, and that they need to slow down too. If your brake lights aren’t working, you’re way more likely to get rear ended than normal. The good news is that troubleshooting … Read more
One of the most undervalued diagnostic tools is the human nose. There’s a lot our nose can tell us about a vehicle with a few quick sniffs. If you happen to smell a rotten egg smell coming from your Hummer H1, it is certainly a cause for concern. It is most commonly associated with a … Read more
It can be very disconcerting if your Hummer H1 is starting and then dies. It is most likely caused by some type of issue with the electrical or fuel system. But, there can be other causes as well. Your H1’s engine needs 3 things constantly and in the proper proportion to keep running. Air Fuel … Read more