Question about Chevrolet TrailBlazer

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2005 inline 4.2 trailblazer P0128 code. temp is just under 210 and when I'm driving 80-85 mph truck is fine but when i slow down to 70-75 mph starts acting like i just put on cruise control and when you give it gas it's like its choking its shelf out but once I get it to 72-73 mph it has all speed back now I can get right back to 80 mph. The best way I can describe it is its like getting too much gas or not enough gas but dont smell anything

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Ryan Lutton
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Our platform gauges are terrible. Watch the real temperature with a scanner. Clean your throttle body also.

Posted on Jun 28, 2017

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Rick M
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Fix the P0128 code first. Usually a bad thermostat

Posted on Jun 28, 2017

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Posted on Jan 02, 2017

ewashmidas
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SOURCE: P0172 and P0128 Error Code 2003 Trailblazer 4WD

PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.

Posted on Jan 28, 2009

  • 599 Answers

SOURCE: 2005 inline 4.2 trailblazer P0128 and P0304 can

PO128 is coolant thermostat(coolant temperature below thermostat regulating temperature). check the coolant level first. PO 304 is a misfire in the number 4 cylinder. hope this helps if you need more help get back to me, please rate my fix as i strive to be the best Thanks Ray

Posted on Dec 02, 2009

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SOURCE: P0128

I think your on the right track. I don't recall if this vehicle has electric or belt driven cooling fans, but if electric (and it's real cold where you are located), make sure they are shutting down when they should.

Posted on Dec 14, 2009

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My 2005 trailblazer starts cold & when hot but when it gets halfway it cranks a lo about halfway down on temp gauge it cranks a long time & the gas mileage dropped a lot could
I know that you can't trust the Trailblazer instrument cluster at all. Our 2007 was the biggest mess, but it's the gauge clusters and not the sending units that are defective. There are Good Folks making a Living doing nothing more than rebuilding Trailblazer Instrument Clusters and you can google that. The only way to know for sure is to verify with other means. For example, For MPH on the speedometer simply drive an indicated 60 mph on any Interstate Hwy that has Mile markers and time how long in seconds it takes to get from one marker to the next. 60 seconds means the speedometer is perfect. A temperature gun can tell you if the temp gauge is working right or not. Is your mileage changing or are the gauges giving you bad info? My advice is start at the gauges because they will drive you nuts. I hope that helps you!

Dec 03, 2017 | Cars & Trucks

2 Answers

P0128 came back after replacing t-stat
code p 128 refers to coolant thermostat---coolant temp below thermostat regulating temperature ====causes --mechanical fault
you say that you have replaced the thermostat and it is just under 210 F which is 99 c or almost boiling point
you will have to investigate why it is running so hot.
check that you put the thermostat in correctly ( bulb section to block/head water
Next point --the codes are originated by the coolant temperature sensor ( puts the fans on and sets the ECM fuel/air ratio for the engine ) so to get it off you will need to reset with a scan tool

Dec 24, 2015 | 2005 Chevrolet TrailBlazer

1 Answer

Code p0128
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Silverado shuts off when I slow down and turn in 4wd.
yes stop driving it on dry pavement....its normal for it to lockup

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P0128
I think your on the right track. I don't recall if this vehicle has electric or belt driven cooling fans, but if electric (and it's real cold where you are located), make sure they are shutting down when they should.

Dec 14, 2009 | 2002 Chevrolet Blazer

2 Answers

2005 inline 4.2 trailblazer P0128 and P0304 can they be related and or whats the fix for P0128 t-stat concern
PO128 is coolant thermostat(coolant temperature below thermostat regulating temperature). check the coolant level first. PO 304 is a misfire in the number 4 cylinder. hope this helps if you need more help get back to me, please rate my fix as i strive to be the best Thanks Ray

Dec 02, 2009 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

Is it hard to change a thermostat in 2005 trailblazer, 6cyl? I got code P0128. Coolant level is ok. Temp gage in car is about 10-15 cooler than normal, about 190-195.
no not hard to do, just make sure you get all the air out of the system,if you need more help get back to me Thanks Ray

Nov 09, 2009 | 2005 Chevrolet TrailBlazer

2 Answers

Check engine light on, diagnostic code 0128 and 0410 keep coming up
P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

P0410 - Secondary Air Injection System Malfunction
(has to do with exhaust system)

Note: There is a technical service bulletin (TSB) regarding code P0410 for a number of GM models. The TSB calls for the replacement of the AIR pump and the installation of a new secondary injection hose.

Oct 13, 2009 | 2005 Chevrolet TrailBlazer

1 Answer

P0410 Secondary air injection system fault, P0128 Coolant temp
most ecu controlled vehicles have a 'limp home'mode if 2 or more fault codes are stored,it is designed to get your attention before damage is caused and to get you to the nearest w.shop to fix,i would have codes cleared and retest vehicle,it is the cheapest and 1st option for any shop,some late models even have excessive mileage past service interval in the 'limp' program

Jul 24, 2009 | 2004 Chevrolet TrailBlazer

2 Answers

P0172 and P0128 Error Code 2003 Trailblazer 4WD
PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.

Jan 28, 2009 | 2003 Chevrolet TrailBlazer

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