Question about 2003 Chevrolet TrailBlazer

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So I have a couple codes reading po128, and I know thats a coolant deal (hopefully, I haven't checked yet), and the other, is code po442, evap emission, small leak. I have a 2001 Chevy S-10 and need to smog it in the next couple of weeks. Will these issues prevent me from passing smog? I understand they need to get repaired, but my biggest concern right now is the smog check.

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  • happyboyjr Nov 07, 2010

    What do I do to fix these?

  • happyboyjr Nov 10, 2010

    So how do I go about fixing these?

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Hello. yes these issues may prevent u from passing the smog test. Best to get them fixed firt if u can. Joe

4 thumbs up please. ty

Posted on Nov 04, 2010

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PO442 code on my 2004 mit galant,LS V6 3.8 how to fix an evap problem small leak


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Jan 28, 2015 | 2003 Pontiac Grand Am

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What is codes po128 ,po440 and p1189 for a 2003 ponyiac grand am gt 3.4 liter and v6 engune?


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Jan 28, 2015 | 2003 Pontiac Grand Am

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Error code po442 1998 saturn sl1


Google the codes & read up

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Aug 26, 2014 | Cars & Trucks

1 Answer

What is the cause for this po128 dtc code on a 2005 chrysler sebring ?


Po128 is the code for coolant temperature too low, or a faulty temperature sensor. Your vehicle needs the coolant at a certain temperature to cool your engine efficiently. I also suggest looking at your coolants protection level with either a hydrometer or refractometer. You can change both the sensor and thermostat fairly inexpensively...yourself. Of course a shop will make a big deal out of it I'm sure. Make sure to clear the code with the scanner after the repair is complete.

Aug 20, 2014 | 2005 Chrysler Sebring Sedan

1 Answer

Check engine light on. Won't stay off. OCD code is po442 po128 coolant.


Just fixed mine with the same code and gm tech advised me to change thermostat which is not a fun job as it is located in the LOWER hose and comes with a gooseneck assembly and O ring.The temp sensor could also be the problem but was told not likely so got by with just thermostat!

Nov 03, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

Need to know what obd code PO446 AND PO128 for a 2002 Daewoo Nubira means


P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.


P0446 - Evaporative Emission Control System Vent Control Circuit Malfunction
Evap vent valve has only one purpose. It closes in order to seal the vent so the EVAP system can pressurize and ensure there are no leaks. Evap vent valve is usually supplied Batt. voltage with key on. The ECM's driver controls the ground, and when grounded, activates the valve (closing it). If the ECM detects a short to ground, and open,or a short to battery voltage on the control circuit, P0446 will set. Code also may refer to ECM detecting that EVAP system is unable to achieve or maintain vacuum during test.


Hope this helps.

Sep 29, 2011 | 2002 Daewoo Nubira

1 Answer

I am getting a po442 code on my scan tool. A small evap. leak detected. I have replaced the gas cap a couple of years ago. I put the lite out and it stays off for about a year then comes back on. Anybody...


This is what they call a 2 trip code. It takes two running times to set. Small leak is 98 % of the time gas cap not on tight enough. Three clicks minimum. Just reset the computer and see if it comes up again. For your year EVAP is not a big deal. Doesn't hurt fuel economy or performance.

Jul 02, 2011 | 2003 Chevrolet Malibu

1 Answer

Getting codes PO431, PO421, PO128


2003 saturn vue, we dont have the engine size, the codes should be and are the same, po 128 means; cooling temp is out of spec, make sure the coolant is full, then replace the coolant emp sensor and make sure the connection is good, i would also replace the thermostant, this is a common code on these and most of the time its the coolant temp sensor or thermostant, ive learned to replace then both to avoid future engine lights with code po128. next we will check the code # po421, this code is that the computer sees that the cat converters are taking to long to warm up, code po 431 is also the same as po421, this code is related to the thermostant and sensor, the sensor give the computer the wrong temp readings and then the compuetr thinks the engine is hotter than it is and thinks the converters should be also hot like the motor but the coolant temp is giving a false reading, if you replace the coolant temp sensor and the thermostant and fill coolant , then reset the light and you will solve the problem, i hope this is helpful, also the sensor is located to the right of the engine if you are standing in front of the motor, heres a picture of the sensor, remember to check connector heres a pic of the connector, good luck.johnjohn2_20.jpg

Nov 10, 2010 | 2003 Saturn VUE

1 Answer

I have serv eng light on with code # PO172 , PO128 , and PO442 , and I replaced fuel tank cap today , light still on ,and I need to get inspection , but I am out of work and can't afford expensive repair...


Code p0172 is MAF, vacuum leak, and fuel pressure.
You can see my TIPS on this site to help with the MAF.
Code p0128 is Low ccolant, ECT or the IAT.
code p0442 is your EVAP system.
Please let me know what you find.

Feb 12, 2010 | 2003 Chevrolet TrailBlazer

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