Nov 21, 2018 · Top Chevy Tahoe P0172 Causes. Here are the most common causes of P0172: Vacuum Leaks– With the Chevy Tahoe, one of the most common cause for the P0172 code to show is a vacuum leak. Take a look around and see if you can find the vacuum leak. Apr 20, 2020 · OBD II Fault Code. OBD II P2635; OBD-II Code Decreased engine performance is defined as a Fuel Pump "A" Low Flow/Performance. The Fuel Pump Control Module determines the required amount of fuel pressure to keep the engine running efficiently.
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