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2000 Blazer weird shifting issue
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synnyzter
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Mar 17, 2015, 11:10 AM
Post #1 of 18
(1943 views)
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2000 Blazer weird shifting issue
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2000 Chevy Blazer 4.3 (automatic) - When I bought it used, it shifted fine, has no issues other than the transfer case wouldn't engage every time. A few months later my overhead console display lights went out, then all the dash lights such as engine, 4x4, the gauges started lighting up and acting weird randomly, then a week later the truck started shifting funny.
Now 90% of the time, the truck won't start in 1st gear, it starts in 2nd, then while accelerating up to 30-35mph it will shift up way too soon and bog down, then Sh!t back down to 2nd, then shift up again, and continue until it hits 30-35, then it fails to shift into overdrive. Also when coming to a stop, it kicks down a gear (into 2nd I assume) pretty hard and clanks pretty loud around 2mph just before complete stop.
Weird thing is every once in awhile, it will go away and shift normal but the engine light is usually lit up during normal shifting.
Could it be the ECM causing all these weird things? Any ideas at all?
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gsferraro
Veteran
Mar 17, 2015, 11:51 AM
Post #2 of 18
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Re: 2000 Blazer weird shifting issue
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Can you get that scanned for codes. Gary
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synnyzter
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Mar 17, 2015, 12:14 PM
Post #3 of 18
(1930 views)
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Re: 2000 Blazer weird shifting issue
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Took it to autozone quite awhile ago and it returned a generic communication code, can't remember which one but it was of no help. I plan on taking it somewhere else just figured id ask around real quick.
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gsferraro
Veteran
Mar 17, 2015, 2:59 PM
Post #4 of 18
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Re: 2000 Blazer weird shifting issue
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Is this feel like its in 4th gear by like 30 mph?
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synnyzter
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Mar 17, 2015, 3:09 PM
Post #5 of 18
(1913 views)
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Re: 2000 Blazer weird shifting issue
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No it never goes into 1st gear, starts in 2nd, then from there shifts to either 3rd or 4th, cant tell which but it bogs down bad. Honestly I dont think it ever shifts into 4th because on the highway it's screaming, certainly doesnt go into 4th once up to speed.
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gsferraro
Veteran
Mar 17, 2015, 5:49 PM
Post #6 of 18
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Re: 2000 Blazer weird shifting issue
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Do you have access to a scanner to see live data? As a test you may want to try unplugging the transfer case control module and driving the car to see if there is any change in the way it drives .
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synnyzter
User
Mar 17, 2015, 6:25 PM
Post #7 of 18
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Re: 2000 Blazer weird shifting issue
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Unfortunately no scanner, not any more. I can certainly try that tomorrow and see what happens. I scheduled an appointment Thursday at a shop which I hate to do but, not the easiest thing to diagnose without the right tools
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gsferraro
Veteran
Mar 18, 2015, 3:03 AM
Post #8 of 18
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Re: 2000 Blazer weird shifting issue
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Let me know what the diagnosis is(i have a trans shop in new york) Gary
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synnyzter
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Mar 18, 2015, 4:28 AM
Post #9 of 18
(1884 views)
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Re: 2000 Blazer weird shifting issue
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Will do, going to be a couple days...
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synnyzter
User
Mar 18, 2015, 2:42 PM
Post #10 of 18
(1874 views)
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Re: 2000 Blazer weird shifting issue
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This is what a proper scan showed, so this is where I am so far:
C0281 - Dynamic Rear Proportioning (history)
C0226 - Left front traction control system channel will not move (history)
C0237 - Traction control system throttle position signal
P0463 - Fuel level sensor 1 Circuit high voltage (history)
P1875 - Four wheel drive low switch circuit
U1026 - Lost communication with Transfer case control module
U1041 - Lost communication with electronic brake control module
U1064 - lost communication with Body control module
The TCCM makes sense as I have no 4wd, the BCM also because of the lights and key fob, there's a lot there so it's all connected somehow.
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gsferraro
Veteran
Mar 18, 2015, 3:27 PM
Post #11 of 18
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Re: 2000 Blazer weird shifting issue
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What i would do is, record all the codes clear them and see what comes back. I would also unplug the tccm and see how it drives, to me it almost sound like this car may be going in and out of 4wd. Do you haven a scanner that reads live data, im wondering whats going on with the 4wd low switch. Gary
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synnyzter
User
Mar 18, 2015, 3:32 PM
Post #12 of 18
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Re: 2000 Blazer weird shifting issue
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Well those history codes are very recent they said. It does all that stuff randomly, I left it at the dealer. They hooked me up. 40 bucks an hour to diagnose electrical lol, obviously I jumped on that deal! Will let you know soon as I get the call.
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gsferraro
Veteran
Mar 18, 2015, 5:12 PM
Post #13 of 18
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Re: 2000 Blazer weird shifting issue
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Wow thats great,i cant compete with that lol.
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synnyzter
User
Mar 18, 2015, 5:16 PM
Post #14 of 18
(1864 views)
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Re: 2000 Blazer weird shifting issue
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My dad knows the guy lol...spent a ton of money at their biz so they know how to treat good customers I'd say
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gsferraro
Veteran
Mar 19, 2015, 5:47 AM
Post #15 of 18
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Re: 2000 Blazer weird shifting issue
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Let me know what the diadnosis is. gary
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synnyzter
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Mar 20, 2015, 5:20 PM
Post #16 of 18
(1830 views)
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Re: 2000 Blazer weird shifting issue
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Should have just went with my gut originally.... My first thought when symptoms began was the TCCM, turns out I was right. $160 to diagnose, the TCCM is $180 lol. But, at least now we know.
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gsferraro
Veteran
Mar 20, 2015, 6:29 PM
Post #17 of 18
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Re: 2000 Blazer weird shifting issue
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I had a feeling that was your problem, alot of issues with the tccm around that year. Gary
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synnyzter
User
Mar 20, 2015, 9:01 PM
Post #18 of 18
(1825 views)
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Re: 2000 Blazer weird shifting issue
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I am shocked at all the things it can affect that has nothing to do with the transfer case lol. I guess just the fail in communication anywhere along the line can cause several strange issues.
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