P0172 P0175 GM troubleshooting

P0172 & P0175 codes on your Silverado, Sierra, Tahoe, Yukon, Suburban or Escalade? I’m going to show you some simple troubleshooting procedures to properly diagnose if it is your EVAP, fuel injectors, or high pressure fuel pump.
You’ll need a scanner to complete this but it’s very easy to isolate the problem.

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00:00 P0172 & P0175 GM codes
00:17 What you need
00:51 Check this first
01:44 diagnose fuel trim
03:20 isolate evap system
05:50 isolate pcv system
06:45 check injector leakdown
07:34 high pressure fuel pump