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po172

  1. Several possibly related symptons?

    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...
  2. PO172, PO400---Garage says I need a new throttle body

    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...
  3. PO172 and reduced engine power mode light

    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...
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