2003 Envoy "Service Engine Soon" Light

[sgiangregorio]

This came on the other day. I checked the fuel cap, and it was loose, so I tightened it up. The light didn't go out. The wife brought it to the dealer and they couldn't find anything wrong, so they just reset the light (which also reset the oil life indicator!! DOH, but no big deal I guess), and they told her "it's just the fuel cap." Well, the light just came on again, 48 hours after the dealer serviced it.

 

The truck is an '03 with 21,000 miles on it. Any ideas on what to look for? Could the oxygen sensor be bad this early? Clogged air filter (I swear a clogged filter tripped the light in her Nissan Pathfinder, I replaced the filter, and the light went out).

 

Any ideas?

 

Thanks

[ZsTB]

The gas cap is usually the main culprit, but you have already gone down that road. Is it running rough or anything, or just like normal. The o2 sensors can go out this early, not normal, but my Trailblazer is in the shop now due to bad o2 sensors, with only 11k miles on her. I would just give everything a once over, from the intake all the way back to the cat. converter and fuel cap.

 

When my o2 sensors went out it started to run real bad (rough) at idle and between 60-75mph.

 

Thanks Chris

[sgiangregorio]

Thanks. It seems to be running fine though. Were your O2 sensor a warranty thing?

[ZsTB]

Yep, is being taken care of under warrenty!

[ZsTB]

You might want to check this TSB out as well:

 

Bulletins for 2003 GMC Truck Envoy 4WD L6-242 4.2L DOHC VIN S SFI

 

04-07-30-013 MAR 04 Air Filter - SES Lamp ON/Multiple Driveability Concerns

 

This TSBis listed for all Envoy's/Trailblazers 2WD/4WD I6/V8

 

Thanks Chris

[sgiangregorio]

Do you have the detail for that TSB? Interesting that it mentions the air filter. As I mentioned, on my wife's Pathfinder, replacing the air filter solved the problem.

[ZsTB]

All it gives is the info that I posted. If you go to the dealer with the TSB #04-07-30-013 they should be able to see if it applies to you. I was doing my normal TSB search for my Trailblazer after I replied to you post and saw that listed and remeber your problem with the air filter.

 

Did some searching and this is what I found:

 

Corporate Bulletin Number 04-07-30-013 will be available in SI on March 18, 2004.

Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Installation of an Aftermarket Reusable, Excessively Oiled Air Filter.

 

So this TSB only applies if you have an aftermarket filter (K&N oil type filter). Are you running the normal filter or an aftermarket one?

 

Thanks Chris

[ylab]

All it gives is the info that I posted. If you go to the dealer with the TSB #04-07-30-013 they should be able to see if it applies to you. I was doing my normal TSB search for my Trailblazer after I replied to you post and saw that listed and remeber your problem with the air filter.

 

Did some searching and this is what I found:

 

Corporate Bulletin Number 04-07-30-013 will be available in SI on March 18, 2004.

Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES) Light On as a Result of the Installation of an Aftermarket Reusable, Excessively Oiled Air Filter.

 

So this TSB only applies if you have an aftermarket filter (K&N oil type filter). Are you running the normal filter or an aftermarket one?

 

Thanks Chris

 

<{POST_SNAPBACK}>

 

 

 

 

Now that Bulletin basically concerns MAS equipped vehicles, however GM appears to be sending it out to all divisions. Funny thing is that the 4.2 I6 doesn't use a MAS, the device in the intake is a hot-wire temperature probe to measure intake temperatures. The text of the bulletin is as follows:

 

SERVICE - ALL BUICK, CADILLAC, CHEVROLET, GMC TRUCK, ISUZU, OLDSMOBILE, PONTIAC AND HUMMER DEALERS

 

 

Subject: A/T Shift, Engine Driveability Concerns or SES Light On as a Result of the Installation of an Aftermarket Reusable, Excessively Oiled Air Filter -- 2004 and Prior Cars and Lt Duty Trucks and 2003-2004 HUMMER H2

Message #: VSS20040056

 

Corporate Bulletin Number 04-07-30-013 will be available in SI on March 18, 2004.

 

Automatic Transmission Shift, Engine Driveability Concerns or Service Engine Soon (SES)

Light On as a Result of the Installation of an Aftermarket Reusable, Excessively Oiled Air Filter

 

Models: 2004 and All Prior Cars and Light Duty Trucks

2003-2004 HUMMER H2

 

DO THIS

First, Inspect the vehicle for a reusable aftermarket excessively oiled air filter

 

DON'T DO THIS

DO NOT repair under warranty if concerns result from the use of a reusable aftermarket oiled air filter.

 

The installation of an aftermarket reusable, oiled air filter may result in:

 

1. Service Engine Soon (SES) Light On

 

2. Transmission shift concerns, slipping and damaged clutch(es) or band(s)

 

3. Engine driveability concerns, poor acceleration from a stop, limited engine RPM range

 

The oil that is used on these air filter elements may be transferred onto the Mass Air Flow (MAF) sensor causing contamination of the sensor. As a result, the Grams per Second (GPS) signal from the MAF may be low and any or all of the concerns listed above may occur.

 

When servicing a vehicle with any of these concerns, be sure to check for the presence of an aftermarket reusable, excessively oiled air filter. The MAF, GPS reading should be compared to a like vehicle with a OEM air box and filter under the same driving conditions to verify the concern.

 

Transmission or engine driveability concerns that are the result of the installation of an aftermarket reusable, excessively oiled air filter are not considered to be warrantable repair items.

 

[sgiangregorio]

Thanks for the info guys. I'm running a regular OEM air filter. Oh well, back to the dealer.

[redvett]

Thanks for the info guys. I'm running a regular OEM air filter. Oh well, back to the dealer. 

 

<{POST_SNAPBACK}>

 

 

 

Your right to take it back to the dealer. You paid for the truck& warrenty so use it. Having it fixed under warrenty is a complaint so to speak.

[sgiangregorio]

Well, you guys would never guess what the problem is...there is a leak in the fuel tank!

 

Are these metal or plastic tanks? Regardless they had to order the tank, so they gave my wife a 2004 Trailblazer as a loaner. She hopes to get it back tomorrow.

[ZsTB]

Good to hear you got it sorted out! I think the fuel tank is a polyethulane(sp) type construction: plastic.

 

Thanks Chris

[sgiangregorio]

Thanks. Seems fine now. The light must have gone out on it's own too, as soon as they started it with the new tank, as the oil life meter wasn't reset back to 100%.

 

Thank goodness for warranties!