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2002 2003 2004 2006 2007 4.2 4wd 4x4 a/c abs actuator air conditioning air suspension alternator amp arnott audio battery black bose brakes clean coolant custom differential door electrical engine envoy exhaust ext fan clutch fuel fuel pump fuse gas gmc gmc envoy grille headlight headlights hid hids hvac idle ignition ignition switch install interior introduction leak led lift lift kit lifted lights misfire mod mods no start noise oem offroad oil olds bravada oldsmobile bravada p0300 paint pcm power steering radio rear reduced engine power replace rims rough idle shocks speakers ss stalling starter stereo subwoofer suspension swap switch tbss tccm thermostat throttle body tires trailblazer transfer case transmission transmission problems vibration water pump wheels wiring xuv
  1. General
    I have a 2003 Trailblazer LT 4.2L I6 with 153,000 miles I am experiencing several symptoms that may or may not be related. Here they are: • Frequent strong fuel smell outside the car • Not all the time, but often, the car will not start. It will turn over, but not start up. If I tap the...
    fuel smell po128 po172 resonator rough idle
  2. OEM Issues
    So the Envoy is begging for me to replace it, but I'm too stubborn because I love it. Last Friday on my drive from VA to PA (300miles) it wasn't running the greatest. Over the weekend the SES came on with a PO172 and PO400 code. I didn't have to go anywhere so I wasn't too worried. Monday comes...
    body po172 po400 throttle
  3. Engine Tunes/Mods
    My 2004 GMC Envoy service engine light is on for 2 days now. I took it to Auto zone and received the code PO172 (rich code in bank 1). The reduced engine power mode light also came on but turned off. The car has been jerking a bit when you accelerate. I've been reading up on similar cases and...
    po172
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