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  1. Unusual ignition Issue!!!!

    02-09 General Tech Q&A
    I have scoured this site for anyone with similar issues but sounds like I may be a pioneer to this one. I have an 06 trailblazer ls 4.2 4wd and have just finished putting a used motor in it but have yet to get it successfully started. I originally tried using the pcm that was on that motor and...
  2. 2005 TB EXT 5.3 wont start, no click, ignition switch good battery good

    OEM Issues
    My trailblazer randomly would not start one morning. Key on, dash lights up, radio works, etc. Go to crank engine and the whole car goes dead. Battery is holding well over 12 volts, so thats no problem. I replaced the ignition switch yesterday, still the same symptoms. Thinking it may be a...
  3. Remote start or PCM?

    Audio and Electronics
    So I picked up a 2006 trailblazer 4.2 and the dealer said that they didn't think anything was wrong but that they had taken the aftermarket remote start off as it was causing problems. So I drove it home rest of the day and next day runs good except the gas cap light came on. But was fine...
  4. Low power and stability light on

    OEM Issues
    Hi everyone, I'm new here. Please bare with me. I bought a 2006 Trailblazer 4.2 LS 2WD in January of this year. I LOVE my car. That being said, I've ran into some problems in the last couple months. First month of having it, it ran like a champ and then one morning, I turned it on and it was...
  5. PCM Ground Location

    Hello! Not sure if anyone is still active on this forum but reading some of your old posts *almost* saved my vacation. Short Story:I am currently looking for the PCM ground that I believe to be on the passenger side of the engine. If anyone could point me in the right direction, I would...
  6. [SOLVED] 2003 Trailblazer EXT L6 4x4 Transmission Madness

    I am trying to determine if a problem a friend is having is the PCM/ECM. His 2003 Trailblazer dumped its tranny and so he grabbed one off of a GMC Envoy(as he tells it). He had driven the Envoy to be sure the tranny was good, no problems. After his 'tech' swapped the transmissions, and...
  7. [SOLVED] NOT SOLVED: Intermittent Limp Mode?replaced solenoid still get P0756

    The "How-To" and DIY Section
    P0756 Shift Solenoid B Wont go away - Need Help I just bought a 2004 I6 2WD with 150k miles. The truck had sat for an extended period due to engine missing on 4-5-6. Towed it home and did the tune up: drained gas tank, cleaned throttle body, new plugs, fuel filter, coil pack for #4 cylinder...
  8. No Start, odd behavior

    Hey everyone I have been on this forum ever since I purchased my 03 LS 4WD and pretty much every little issue that has come up I've been able to find an answer for. So, I thank everyone on here for that. Now, I have a real head scratcher, my truck won't start at all. No work done recently...
  9. PCM issues

    I need to know if I get a pcm from an exact make and model trailblazer can I just swap them out and ride?
  10. Another rough idle issue

    Air Induction
    Hey guys, I have been scouring this site for a couple weeks now trying to find a solution. First off, I have 99k miles on my 05 TB. Let me give you a walk through with my issue: Vehicle was running great, but I was approaching 100k miles so I decided to swap the spark plugs with the AC-Delco...
  11. Rpms rev up during shifting

    OEM Issues
    I have a 2005 Trailblazer LT 4x4 with the 4.2 I6. 158k miles Wife recently noticed (2-3 days ago) that the rpms have been fluctuating higher during shifting. I drove last night and confirmed. 35mph- 2500 starting rpms, shifts and goes up to 3000—3500 for a quick second and then settles back to...
  12. 2006 EXT Trailblazer NO CRANK/NO START

    I think I had this posted in the wrong section, I will repost it here: My 2006 Trailblazer 4.2 L won't crank/start. The car is driven regularly. Some unusual symptoms: 1. Cannot crank the starter with key....Battery directly to the solenoid will crank (but not start) the engine. 2. Cannot...
  13. Pcm4less tune - worth it? Imho

    Engine Tunes/Mods
    Hi everyone, Before you get offended from what I am going to say, I'm not trying to put out a bad review to PCM4LESS, and there are many threads on here praising them, in which people have LOVED their tuned PCM's. I just recently installed my tuned PCM from them and wasn't too impressed...
  14. CASE Re-Learn = $135 at Chevy Dealership

    Engine Tunes/Mods
    Hi everyone, I am new to the site and have just ordered a tuned PCM from PCM4LESS. I was an idiot and didn't read the instructions that I now need a CASE relearn. I have not yet found anyone in Minnesota that knows how to do it or has the Tech II. My local Chevy dealership said they'd do it...
  15. P0606 code, bad acceleration

    OEM Issues
    Hey guys first time user here. I have a 2004 trailblazer with 130,000 miles. I was driving down the highway and noticed my car started to have trouble accelerating/shifting. I cleaned the throttle body to see if it would make a difference but the car is shifting funny. Seems like the rpm's are...
  16. any ideas? p0606

    OEM Issues
    So I've had a lot of problems fixed by my buddy on my 04 TB. He did a huge amount of work, fan clutch, ignition swith, water pump, tranny lines, tranny flush, coolant flush, wheel bearings, tires etc because I was moving from NY to TX. Anyway, no problems til yesterday. Went to work, was...
  17. HELP - Loss of Power and Shifting Problems (No Engine Light)

    OEM Issues
    Hi all, I'm new to the forum and hoping someone can help me... PLEASE!!. I have a 2003 Envoy with the l6 and we are having major issues. It has a major loss of power at full throttle or under heavy acceleration. Normal driving is fine but when I mash the pedal to WOT it may or may not go into...
  18. Still have crazy voltmeter readings after new batt. & alternator

    OEM Issues
    :confused: Hello, and some advice, please! I had low dash voltmeter readings 2 weeks ago (9v) on the OEM alternator and a 2 year old Pep Boys battery. I ran right to my mechanic and he tested the system. He replaced the battery and serp belt but said the alternator was OK. The next day, I got...
  19. Engine Dressing

    Engine Dressing

    Engine Degreased and dressed with Chemical Guys Black On Black. K&N Cold Air Intake. Modded PCM from PCMforLess. Optima Yellow Top. VVME HID's 6000K lows/fogs, 5000K highs
  20. [SOLVED] 2002 envoy died while driving, not turning over

    OEM Issues
    Hello everyone, I am new to this trailvoy Forum. I have used it many times before and im many cases it has helped with my problems. I recently just had a problem with my envoy last week that I think I should share with all of you. Last week I was driving along and out of nowhere my truck stoped...