Question about 2004 Chevrolet Blazer

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Trouble codes P0128, P0455 and U1041

Service engine soon light is on

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P0128 is the coolant is below normal temperature.
P0455 is Evap system detects a large leak.
U1041 is communication was lost to brake control module.
It is weird that you are having these problems at the same time.
You may not have a problem in anyone of these systems. But again you may.I would suggest that you look into the battery, related wiring, connections, and the alternator. If the electronics are not getting enough voltage then you can have system failure.

Posted on May 14, 2010

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P0050, p0030, p0128, p0401, p0455


there is a code table
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Mar 19, 2013 | 2006 Pontiac G6

1 Answer

Check engine light on got a diognostic and code P0128, P0420, and P0455 popped up trying to figure out what these codes mean and what I need to fix on my car


P0128 ECT Sensor Below Thermostat Regulating Temperature

P0420 Catalyst System Bank 1 Low Efficiency

P0455 EVAP System Large Leak (0.080") Detected

For the 'P0128' your engine isn't getting up to operating temerature. This could be because of a low coolant level or your thermostat is stuck open. For 'P0420', this indicates your catalyst isn't working as well as it should. If you have a four cylinder, this will be the first cat in the system, if you have a V6, then it will be the one on the driver side. Since this code can also indicate a clogged catalyst, you should get this checked at an exhaust shop. They can do a back pressure test to see if it is clogged. For the 'P0455', this indicates you have a fuel leak from the pressure system in the fuel tank. The EVAP takes fuel from the tank that builds up pressure and stores it in a canister until you start the engine. Then it shunts this fuel into the engine to be burned.

Jan 06, 2011 | 2005 Pontiac Grand Prix

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P0128 Code for a 2004 trailblazer with service engine soon light


Replacing it is the only fix. Sounds like it may be sticking open slightly.

May 27, 2009 | 2004 Chevrolet TrailBlazer

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Service engine soon light on 2003 Saturn Vue


Here is the definition of the code in GM manual:
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Feb 12, 2009 | 2003 Saturn VUE

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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

1 Answer

2003 VUE-how do i locate/replace coolant temperature sensor


Its on the drivers side of the engine below the intake manifold. Why do you want to replace it? I have worked with the VUE since day one and I have yet to see a bad coolant temp sensor. If you are having trouble with the engine temperature or the amount of heat in the car a very common cause is the thermostat sticking open and not alowing the engine to reach operating temperature. The most common telltale to this condition is usually the service engine soon light is on with a p0128 code stored in the PCM.

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4 Answers

Service engine soon light came on, the codes was p0335 and p0455


Code 455 happens when the gas cap is loose or gone. Replace the gas cap. To get the service engine light to turn off you need to reset the computer by unhooking one of the battery cables and then reattaching it.

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