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How to Resolve Code 84 Fault in Buick Excelle?

2 Answers

LeCali

07/25/25 3:52pm

The wrench warning light is illuminated, and the fault code Code 84 appears with a general company program detection. This indicates an issue with the body system. It is recommended to visit a 4S shop for inspection.

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JuliaDella

08/11/25 9:35pm

My Buick Excelle also triggered the P0084 fault code last year, which really worried me. At the repair shop, they diagnosed it as an issue with the fuel pressure regulator control circuit. The mechanic first used a diagnostic tool to check the data stream and found abnormal fluctuations in the low-pressure fuel line pressure. After replacing the fuel pressure sensor, the fault code persisted. Eventually, they opened the fuel tank and discovered the fuel pump filter screen was clogged like a sieve. This car has a design flaw that makes it prone to carbon buildup, so it's recommended to regularly use fuel system cleaner. Also, avoid frequently running the tank dry, as sediment from dirty fuel can affect the pump's lifespan.

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