How to Solve the Code 84 Fault in Buick Excelle?
2 Answers
Solution for the Code 84 fault in Buick Excelle: Check whether the throttle valve is swollen or the throttle position sensor is damaged. Inspect if the ignition coil or spark plugs are faulty. Examine whether the accelerator pedal sensor is damaged. Check for loose wiring terminals or poor contact caused by loose wiring. Here is some additional information: Code 84 fault indicates reduced engine power. The Excelle is a mid-size car launched by Buick, a brand under SAIC General Motors, based on the "Global Platform, European and American Technology". It is equipped with a 1.3T turbocharged engine, with a fuel consumption of approximately 5.2 liters per 100 kilometers.
My Buick Excelle popped up this trouble code 84 last year, and it scared me so much that I immediately pulled over to check. As a veteran driver with ten years of experience, I suggest you stay calm first and find an OBD scanner to plug into the car for detailed information. This trouble code is usually related to the exhaust system or fuel pressure. In my case, the exhaust pressure sensor was faulty, causing the engine light to come on. I tried checking the wiring myself and found a loose connector, so I reconnected it tightly, but it didn’t work. I ended up spending a few hundred dollars at the 4S shop to replace the part. Regular maintenance of the exhaust system is crucial—avoid overloading and long-distance driving, and change the oil periodically to prevent similar issues. After the repair, I’ve been regularly using a scanner to check for hidden faults to prevent minor issues from escalating.
