Posts Tagged: P0172
P0172 trouble code and fuel in oil plus rough idle and engine run-on
GM has a fix for a P0172 trouble code and fuel in oil, rough idle, and engine run-on GM has issued a service bulletin #PIP4783B to address a P0172 trouble code and fuel in oil, rough idle, and engine run-on the GM vehicles listed below. Before you perform any diagnostic tests, pull the engine oil dipstick, and check for the presence of fuel. GM has determined that a P0172 System Too Rich (Bank 1) may be caused by a defective high-pressure fuel pump that’s leaking fuel into the crankcase when … Read More
How to Fix a P0172 Code the Right Way
The Most Common Causes of a P0172 Code Quick Read A P0172 code means the engine computer sees a consistently rich air-fuel mixture on Bank 1. In plain English, the engine is getting too much fuel, not enough air, or the sensors are lying about one or both. The fastest way to fix a P0172 code is to understand fuel trims, verify sensor accuracy, and then check fuel delivery. Guessing gets expensive; data gets results. P0172 Code Explained: What “System Too Rich” Really Tells You When a scan tool shows … Read More