Why is the engine fault light of the Envision always on?
4 Answers
There are many reasons why the engine fault light of the Envision is on. The details are as follows: 1. Insufficient engine oil: When the engine oil is insufficient, the cylinders and pistons cannot be lubricated, which affects their normal operation and triggers the engine fault light. Solution: In this case, the engine oil needs to be replenished immediately. Additionally, the engine oil and oil filter should be replaced every 5,000-8,000 kilometers. 2. Overheating engine: After prolonged aggressive driving, the engine temperature may rise excessively, causing it to operate under overload and triggering the engine fault light. Solution: In this case, turn off the engine and wait for it to cool down to normal levels. 3. Engine misfire: An engine misfire prevents the engine from operating normally. In this case, a thorough inspection and repair at a repair shop or 4S store is required.
I encountered the same situation last time when driving an old-generation Envision. The persistent yellow warning light on the dashboard was really unnerving. The most common causes are: a faulty oxygen sensor triggering the light due to abnormal exhaust emission data; or a clogged catalytic converter causing poor exhaust flow; it could also be caused by using low-quality gasoline leading to incomplete combustion. I'd suggest avoiding aggressive acceleration for now—check if throttle response has become sluggish and whether fuel consumption has suddenly spiked. Oh, and don't forget to inspect basic oversights like an improperly tightened fuel cap. If the cause remains elusive, you must use an OBD scanner to read the trouble codes. A mechanic specializing in American cars told me Buick models are particularly prone to sensor issues.
Oh, I have so much to say about this! My Envision just had its engine light come on right after the warranty expired. At first, I thought it was a false alarm. Later, I found out that the throttle body on the older LTG engine is particularly prone to carbon buildup, especially with stop-and-go city driving. I suggest you open the hood when the engine is cold and listen for any hissing sounds from the throttle position, which could indicate a leak. But the most annoying issue might be the electronic thermostat failure—if the coolant temperature doesn’t rise properly, it’ll throw a P0128 code. Last time I was at the repair shop, I saw a car that went through three oxygen sensors before the issue was resolved, so never just replace parts at a random roadside shop.
This issue depends on the specific model year. For pre-2015 older vehicles, pay attention to aging fuel evaporation system hoses - if you smell gasoline, that's likely the cause. Newer China-6 models are more troublesome; if the GPF (Gasoline Particulate Filter) gets clogged, the dashboard will show two warning lights. For DIY troubleshooting, first disconnect the battery for 10 minutes to reset the ECU, but if the lights remain after three restarts, professional diagnosis is mandatory. Last time I helped a colleague read an OBD code P0172 (Fuel System Too Rich), and cleaning the fuel system fixed it. Remember to use water remover for Envision's fuel tank - its high-pressure fuel pump is particularly sensitive to water.
