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Hello all I have a 2009 Silverado 1500 LT 5.3 with 93K and she's been acting up the last couple of weeks. The check engine light came on throwing code p0305 which is a misfire in cylinder 5. Bought new plugs and will be putting those in tonight. The code could also be the coil pack or the injector but figured we'd start cheap and work our way up. Then one day I had it in drive while I was waiting on the kids to get out of school and the following service messages popped up: Stabilitrak off, traction control off, service stabilitrack, service traction control. As soon as these popped up the truck started idling really rough. Once I put in in drive and started going again the messages went away. It is now happening every time it is in park and idling. Could the plug/coil pack/injector issues be causing all of this as well? I've read that this is common with throttle body problems but those are usually accompanied by a "reduce engine power" message and then the truck cutting off while driving. The truck also needs new brakes all around and new rotors on the front so could that be the issue? Thanks in advance for any insight anyone can offer!!
 

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My truck is a 2002 5.3L. I had a misfire in cylinder # 3 and it was a loose injector connector. You might check that on cylinder 5 while you are at it. I don't know if that will cause a TC or Stabilitrac issue.
 

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My truck is a 2002 5.3L. I had a misfire in cylinder # 3 and it was a loose injector connector. You might check that on cylinder 5 while you are at it. I don't know if that will cause a TC or Stabilitrac issue.
Just changed out the plugs and none of them looked too bad so I have a feeling we're gonna have to go down to the injector. I'll be sure to check the connection before replacing! Thanks for the suggestion!
 

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Your problem is probably this one. I have discovered it is very, very, common.

http://www.gmtruckclub.com/forum/showthread.php/55725-Service-Stabilitrak-Service-Traction-Control-and-Reduced-Engine-Power-anyone?highlight=Service+Stabilitrak

Check the service bulletin on page 3, there is a 10 years extended warranty.

Please excuse my ignorance but I'm not quite sure what you mean by "service bulletin". I went to pg. 3 of the thread and saw a post within the thread that said one of the members had the work done under warranty but they weren't sure whether it was a 75K or 100K mile warranty. I purchased the vehicle used in October of 2012 so I didn't figure the warranties would transfer but when I set up an account at gm.com it says that the warranty is still good so I'll be headed to the dealership tomorrow to have it looked at for sure! Thanks so much for your post because I hadn't even considered the possibility of this being covered by a warranty!
 

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Please excuse my ignorance but I'm not quite sure what you mean by "service bulletin".
Sorry, it is a document issued by GM and sent to their service departments. It is actually a Technical Service Bullrtin, usually referred to as a TSB. A TSB will provide a list of vehicles effected and a step by step procedure to resolve the problem.

When you go back to my link, look at post #93 (it just dawned on me, your page three might be different from my page three, as we can change the number of posts per page). Here is a second link to the TSB http://www-odi.nhtsa.dot.gov/acms/cs/jaxrs/download/doc/UCM429727/CSC-10047220-3332.pdf

I have the same problem with my truck, I have an appointment to have it fixed on Wed. The SA told they would change the sensor first and if that does not solve the problem, they would change the throttle body.
 

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Sorry, it is a document issued by GM and sent to their service departments. It is actually a Technical Service Bullrtin, usually referred to as a TSB. A TSB will provide a list of vehicles effected and a step by step procedure to resolve the problem.

When you go back to my link, look at post #93 (it just dawned on me, your page three might be different from my page three, as we can change the number of posts per page). Here is a second link to the TSB http://www-odi.nhtsa.dot.gov/acms/cs/jaxrs/download/doc/UCM429727/CSC-10047220-3332.pdf

I have the same problem with my truck, I have an appointment to have it fixed on Wed. The SA told they would change the sensor first and if that does not solve the problem, they would change the throttle body.

You, my friend, are AWESOME! If I weren't a married woman I'd kiss you square on the mouth!!! So glad that I'm not going to have to spend all that extra money! If only this covered the injector issue too!
 

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If I weren't a married woman I'd kiss you square on the mouth!!! !
Hey, that's just a formality, we're all friends here, haha. Seriously though, I hope that is the "Reduces engine power" problem your having.

The mis-fire on #5 could be a coil pack, GM packs don't seem to have a long live. Try swapping the #5 coil with the #3 coil and see if the problem moves with the coil to #3. If it does, it's the coil.

Ya know, before I'd swap the coils, I'd take a close look at the high voltage wire from the #5 coil to the #5 plug. If the wire is damaged, it could be the problem. If the wire looks good, swap the coils.

BTW, the plugs were due for a change, so when you get the other two problems fixed, you'll probably find the new plugs are giving a little better performance.

Oh, and the plugs are numbered from the front driver's side corner. The odd numbers on the driver's side, even on the passenger.

 

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HA! Didn't even think to swap the coils first! All of the wires look good so I'll swap the coils first before dropping that $90 simply to find it's the injector! I haven't gotten the reduce engine power message yet but everything else is the exact same symptom wise so it's probably only a matter of time. I even lost power driving yesterday which is the newest symptom so hopefully I can get it in the shop before it stalls out on me with all 4 kids in tow! Thanks again for all of the info and suggestions! The last Chevy truck I owned was an '85 Suburban with a 454 so going from a carburetor to all of this new computer crap has been a real pain in my neck! Having to relearn almost everything!
 

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I think I'd fix the mis-fire first, they (GM) might use it as an excuses to charge you for the sensor problem.
 

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Mobill,

Hey there! As a customer service representative, I'm not able to provide much in the way of do-it-yourself information, so I'm glad to see forum members are beginning to step in with feedback. If you have any lingering concerns please contact me via private message.

Jennifer T.
GM Customer Care
 

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We've been having issues with the Battery Low Start Engine warning. The dealer claims this is normal. I don't agree.

We got the truck back yesterday afternoon. It snowed last night after two weeks of clear and dry/cold weather. I started the truck up and scraped the snow/ice off. When I got in to drive off, I put it in drive and the engine immediately ran rough and got the message: Stabilitrak off, traction control off, service stabilitrak, service traction control: Reduced engine power. This has never occured before.

We purchased this 2010 Silverado new in May 2010 and it has 26,130 miles on it. After reading all the threads/comments I would think Government Motors would re-engineer this system and issue a recall and correct this issue.
 

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We've been having issues with the Battery Low Start Engine warning. The dealer claims this is normal. I don't agree.

We got the truck back yesterday afternoon. It snowed last night after two weeks of clear and dry/cold weather. I started the truck up and scraped the snow/ice off. When I got in to drive off, I put it in drive and the engine immediately ran rough and got the message: Stabilitrak off, traction control off, service stabilitrak, service traction control: Reduced engine power. This has never occured before.

We purchased this 2010 Silverado new in May 2010 and it has 26,130 miles on it. After reading all the threads/comments I would think Government Motors would re-engineer this system and issue a recall and correct this issue.
If you refer to the TSB in my thread #3, it should address your problem (also check #6 for the post #)
 

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Just to share my experience to hopefully help someone else, we have experienced the same issues with our 2008 suburban. For several days we have searched and read countless sites trying to find what was causing the rough idle, stabilitrak warning, and the hard shift from 1st to 2nd... After going by advance auto, O'Reilly's, and Auto Zone and having them hook up the code reader, we kept getting several codes. From oil pressure sensor warnings (which I replaced first) to a warning related to the stabilitrak needing serviced. But the code that turned out to be the fix to our issues was the multiple misfires on our number 7 spark plug. One of the guys at AutoZone suggested that it was most likely the coil pack that was the problem. With the vehicle running rougher and rougher I (not a mechanic by no means) swapped the ignition coil pack on #7 with #5 to see if the misfire code would then switch to #5 as well. Running rough I went back to two different stores to run the diagnostics and it was still showing up as the #7 misfiring. At that point the automotive angel nudged me to go ahead and buy a new spark plug. After an hour of trying to find my socket wrench and busting a knuckle getting the old spark plug out, I was a little shocked to see the old spark plug corroded and pretty ugly to look at. I got the new plug in and crossed my first fingers... And upon starting her up she ran like a top. No more warning lights... No more service the stabilitrak errors... And everything seems to be great. Not sure if this will fix everyone's problem, but after $7 for a new plug and a skinned knuckle the problem seems to be fixed. Hope this helps someone and good luck!
 

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Just to share my experience to hopefully help someone else, we have experienced the same issues with our 2008 suburban. For several days we have searched and read countless sites trying to find what was causing the rough idle, stabilitrak warning, and the hard shift from 1st to 2nd... After going by advance auto, O'Reilly's, and Auto Zone and having them hook up the code reader, we kept getting several codes. From oil pressure sensor warnings (which I replaced first) to a warning related to the stabilitrak needing serviced. But the code that turned out to be the fix to our issues was the multiple misfires on our number 7 spark plug. One of the guys at AutoZone suggested that it was most likely the coil pack that was the problem. With the vehicle running rougher and rougher I (not a mechanic by no means) swapped the ignition coil pack on #7 with #5 to see if the misfire code would then switch to #5 as well. Running rough I went back to two different stores to run the diagnostics and it was still showing up as the #7 misfiring. At that point the automotive angel nudged me to go ahead and buy a new spark plug. After an hour of trying to find my socket wrench and busting a knuckle getting the old spark plug out, I was a little shocked to see the old spark plug corroded and pretty ugly to look at. I got the new plug in and crossed my first fingers... And upon starting her up she ran like a top. No more warning lights... No more service the stabilitrak errors... And everything seems to be great. Not sure if this will fix everyone's problem, but after $7 for a new plug and a skinned knuckle the problem seems to be fixed. Hope this helps someone and good luck!
If you have the 5.3l with afm you are at the beginning stages of the major failure that is extremely costly to repair. I would image what you saw all over your plug was burned oil. If the plug looks like that imagine what the piston rings and cylinder look like. One of 2 things will happen. The rings in cylinder 7 will get so bad that you will have major oIl usage issues or the lifter on cylinder 7 will collapse. Keep an eye on your oil consumsion. Also, If I were you I would get a range technologys unit and disable that afm immediately
 

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If you have the 5.3l with afm you are at the beginning stages of the major failure that is extremely costly to repair. I would image what you saw all over your plug was burned oil. If the plug looks like that imagine what the piston rings and cylinder look like. Keep an eye on your oil consumsion. Also, If I were you I would get a range technologys unit and disable that afm immediately
Well thats not very reassuring! Haha... Although it's not very funny I guess. Not sure what a range technology unit is and what does afm stand for? Sorry, but as I stated I'm not mechanically inclined. Also, you seem to be pretty up on the issue. What is the problem behind all of this? We have noticed that it is consuming oil. Thanks in advance for your reply!
 

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If you have the 5.3l with afm you are at the beginning stages of the major failure that is extremely costly to repair. I would image what you saw all over your plug was burned oil. If the plug looks like that imagine what the piston rings and cylinder look like. One of 2 things will happen. The rings in cylinder 7 will get so bad that you will have major oIl usage issues or the lifter on cylinder 7 will collapse. Keep an eye on your oil consumsion. Also, If I were you I would get a range technologys unit and disable that afm immediately
Google AFM and know what that is now...
 

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Mike, before jumping to an AFM conclusion, this may be the first time the #7 plug has been changed. The original plugs may be still in the engine.

Maybe a new set of plugs is the necessary prescription.
 

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Thanks @RayVoy... I can only hope. After lots and lots of reading I'm worried that this is the beginning of the issues that so many are reporting. And we have experienced a large consumption of oil that is a good sign of what's going on. Not sure what to do at this point. But thanks again for the silver lining!
 
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