Question about 2004 Chevrolet TrailBlazer

3 Answers

Service Engine Soon Light on a 2004 Trail Blazer

My SES light came on yesterday under what I would consider to be normal driving with no noticeable problems (at least to my untrained eye and ear)... I ran the OnStar diagnostics, and they told me they received signals indicating an error with ether transmission or power train.

Today, I called the Chevy dealer, and they want $100 just to run a diagnostics on it. Then the repair costs would depend on what they find.

Is there anything I can do prior to bringing it to the dealer to check things out on my own?

Much appreciated,
Greg

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  • 4 more comments 
  • gromenesko Dec 04, 2008

    At this point, I'm very hopeful. I couldn't find the fuses labeled as you mentioned, but I did take the battery cables off (both though I know I didn't need to)... I also fittled with the gas cap and doubled up a gallon bag and put in in between the cap and receiver... with these two, the light stayed off for 2-3 minutes... I am planning to replace the gas cap, and pray that this is all I need to do...

    Thanks, you just saved me about $100 plus what ever some mechanic would come up with as possible things to try...

    Very much appreciated,
    Greg


  • Anonymous Feb 09, 2009

    I am having this same problem. My Service Engine Soon light came on under normal driving and I dont hear or feel anything out of the ordinary.

  • Jose .A. Jimenez Mar 12, 2009

    have a 04 chevy blazer w/39,000 miles, service engine soon light came on, took it to Autozone for free check, code came up as po128. possibilities were #1- low coolant level, just had the system flushed and filled. #2- thermostat defective, never runs hot, avg. temp on gauge 190 - 200 degrees, I also checked firmness of top hose to double check t-stat, nice and pliable. #3- defective ECT sensor, I also tried the gas cap protocal and disconnect the positive from the battery. I figured I tried, everthing stated, I just couldn't find the ECT sensor, thought it would be next to the thermostat hub. Can you help me. thanks,Jose

  • Timothy May 23, 2013

    same here..i had codes for EVAP system..i had dealer replaced the one on the engine and just replaced the one at the tank..light stayed off for 2 days and came back on..when i had it checked at Advanced Auto, the guy said there was another code coming up that said thermostat..this is my next step to replace the stat unless someone has any other ideas..i love the car and hasnt given me any probs til now.

  • Timothy May 23, 2013

    i am having the same problem with my 04..I had it to the dealer and they said that the purge valve was the problem..They replaced it and 2 days later the light came back on. I took it to Advanced auto and theysaid it was a EVAP code. Also there was a thermostat code. Not running rough or stalling. Temp runs about 200. Next step is to replace the stat and see.. Unless someone has any other ideas.

  • Angela P
    Angela P Sep 07, 2014

    never anything wrong with the vehicle. And now they just go on and off all the time. I don;t know if this is helpful to you at all.

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  • 333 Answers

VERY SIMPLE
1. Turn key to the "on" position but don't start car
2. Pull the PCM BAT and PCM IGN fuses in engine compartment
3. Wait approximately 5 minutes
4. Turn ignition off
5. Replace fuses
6. Start the car and the make sure the light has went off.
then check to see if your gas cap is on right. If this light comes on again then it is time for the dealer. If you can't find them fuses then just disconnect the battery for five minutes reconnect the battery and when you start the truck the light should be out. just let it idle for 2 minutes with no heater or radio on. and you set. I hope this helps you.

Posted on Dec 04, 2008

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The Service Engine Soon Light has been mostly on lately, although it periodically goes off. Since we had a remote starter installed, we have had problems with the battery and the 04 Trailblazer sometimes needs a jump. Today, we had the back latch open and sure enough the vehicle needed a jump. The good news is ..the ses service engine soon light went out after that event. The advice to pull the fuses or disconnect the battery seems to have some merit Thank you ! I just hope it stays out !!

Posted on Nov 04, 2013

  • Ed Ward
    Ed Ward Nov 08, 2014

    you can get a code reader from the local parts store for about 60 bucks now.its been very handy on my trailblazer, since ive had to replace alot of small stuff causing the check eng light to come on.

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Defroster is always blowing even tho i have heater knob on heater and have no heat on bottom by feet? could this be a vaccum hose?

Posted on Dec 27, 2008

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What is code 26


I'm sure the website cited will be of help. The infamous code 26 quad driver comes up pretty frequently on the Saturn Mailing List. One of the better technical explanations for pre-OBDII Saturns has been quoted several times. Here is the message, edited somewhat:
(credits to Ray Prill)

===== Quote on =====

>
> Yesterday, I saw my first Service Engine Soon light.
> I checked what code my car had stored, and it was #26.
>
> Code 26 (according to Haynes):
> Quad Driver output fault
>
> Possible cause: The PCM detects an improper voltage level on the circuit that
> is connected to the Quad Driver Module.
>
> Now, my questions are... What IS the Quad Driver Module, what does it do, and
> where is it?

Pretty vague, isn't it?

First of all, don't panic. Usually, this is not a serious
problem. Let me explain.

Code 26 is a *very common* SES indication to get with a Saturn that
has a few years on it. Most of the solutions, luckily, are not costly.
However, this may depend on the year of your car.

Background
----------
The "Quad Driver" is a device in the computer that "drives" electro-
mechanical devices in the car. Computers run with very little current
(milliamps or microamps) in their circuits. But the devices that
turn on your cooling fan, bulbs, or emissions relays may require
current in a higher range, say tenths of an amp.

Thus, the computer can't talk very well with such a high current
device. It needs help, and it gets in in the form of this Quad Driver
device. The computer sends a signal (very low amps) to the driver, and
it in turn then signals the electromechanical device to do whatever it
needs to do with a higher current which that device can use.

It sort of "drives" the device by remote control.

Code 26
-------
OK, fine, that is the theory. So why the code 26? Well, in almost all
cases, the actual driver device does not fail. What fails is one of
the electro-mechanical devices attached to it. The way the SES light
works, it will come on when either one of the driven devices fails or
if the driver itself fails.

The good news is it is usually not the costly driver device. The bad
news is this is called a "QUAD" driver. That means it drives four
devices. Even worse, there are usually TWO quad drivers, so you have
a total of EIGHT devices to check for just this one SES light.

That's right, code 26 means that one of 8 devices (and a 9th, the driver
itself), could cause the problem. You have to check 8 different things.

Probable causes
---------------
I don't have my manual here, but I'll try to remember to post the
exact devices to check. The following is from memory, so bear with me.
Also, remember my car is a '91, so this may have changed somewhat in
following years.

The QD generally drives things like relays, solenoids and light bulbs.
There are a few things that are easy to check, like the bulbs and
relays.

The SES bulb and (I think) "HOT" bulb are driven by this device. You
should check that they both come on when you put the car to "on" before
starting. Of course, the SES must work, since it came on for you.

Then the A/C relay and Cooling fan relay are driven. For A/C, simply
check that your A/C works OK. The relay is pretty silent, unlike
some cars, so you can't always hear it click. Just make sure it works.
The cooling fan can be checked when you sucked out the code. Since you
know how to get the code, you should have noticed that the FAN comes
on for a while before getting the code out. (The bulbs also light.)
If the fan isn't coming on, check the relay. The Haynes manual probably
tells you exactly when the fan comes on during the procedure.
The relay is accessible in the under-hood fuse block.

After that, it gets tougher. You have to check some emissions solenoids.
From what I've read, the MOST COMMON cause of code 26 is either the
EGR solenoid or the canister purge solenoid. The EGR solenoid is
real easy to access. It sits right above the EGR valve and takes a minute
to disconnect on Sx2 models. The canister purge solenoid is a pain.
It is attached to the block on the firewall side. You have to take it
out blindly by putting your hand through a small "hole" between all the
hoses and wires.

I forgot what else is controlled by this device. I'll try to get
my manual tonight to look.

I had an SES light last spring. In my case, I guessed wrong.

I narrowed my SES last year down to the CPS or the EGRS, and incorrectly
deduced the CPS. What a pain to replace this. But I was wrong. That
wasted $20. My problem was the EGRS, and it was also a $20 part. Very
easy to replace.

I should mention that my symptoms were opposite of yours. Mine would
come on only while driving for a while, then go off when I stopped.
I should also mention that the CPS and EGRS are common causes of
code 26, and the irony is they are both Nippondenso parts, made in
Japan. How ironic!

Either way, if you take it for service, the Saturn diagnostic computer
should be able to discern between the two or any other device that
is causing this code. They can read more information than we can
by just pulsing out codes.

So, depending on your skill and your luck, you may or may not want to
try this. Like I said, most of the them are easy, thus even if Saturn
service does it, it usually is not costly.

==== Quote Off ====

And a followup:

==== Quote On ====
This is a follow up to yesterday's post about a "quad driver" fault.

Yesterday I mentioned the causes for a "code 26" fault with the
SES light. There I detailed the following causes:

1) SES light burned out
2) "HOT" light burned out
3) A/C relay
4) Coolant fan relay
5) EGR solenoid
6) Canister purge solenoid

I couldn't remember the other two causes. Remember, the "quad" in
the driver means it controls 4 outputs. Since there are 2 QDMs,
they control 8 outputs.

The other missing items to check are:

7) Speedometer output
8) Upshift/Shift to D2 bulb


Hope this helps. As you can see, most items are easy to
check except for the solenoids. These can be checked by
measuring their resistance.

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Good Day,

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hope this helps again

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