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This DTC checks for undesired intake vacuum flow to the EVAP system. The control module seals the EVAP system by commanding the EVAP canister purge solenoid valve OFF and the EVAP canister vent solenoid valve ON. The control module monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system
engine and engine cooling system i would overflow bottle level first my need to be topped up engine may want to be drawing in coolant but none in reservoir if not this issue search on line p2138 code gmc serria 2008 2500hd there are couple sites with different info
under the intake plentium right in the middle of the valley between the heads. bad for wires getting corroded and rusted. it holds water in the knock sensor holes, you can buy the harness
Service air bag means something is amock. The first step is to PULL the error code. Then you will know here to look. Often there is a sensor, front and center that gets it's connections damaged by road salts. But do not parts replace, be sure that you have the correct item...Pull the code(s)
you can try unhooking the battery for a couple hours to reset the code in it then run it for 50 miles to get the diag back on line and run it agian as long as the check engine light dont come on in that 50 miles and try unlocking the door with the main key to turn of the securty light or hit the unlock on keyless entry if you have one
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