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LMC Truck



Username Post: check engine light        (Topic#348988)
bikernut 
Member
Posts: 100

Loc: NEW HAMPSHIRE
Reg: 02-04-03
01-03-18 02:54 AM - Post#2719853    

on my daughters 2001 GMC Yukon XL with 5.3 engine she went in for the annual state inspection and just before getting there the check engine light started glowing. of course it failed the inspection and they gave here a temporary one for 2 extra months. well being a single mother she couldn't afford to do this right away so after 4 months she finally could afford it and had it done. now the question is she was told she had to put 100 miles on it to cancel out the code as just clearing it wouldn't work. if she drives in now with an expired inspection ticket she get fined for driving an uninspected vehicle. now is there a way to get the code canceled out with out driving it for 100 miles and risking a ticket. thanks

3500 Dually Member # 252 and Damn proud of it
2016 GMC Denali Dually Duramax w/Automatic
enough power to pull this old guy from the P!ss Pot
1992 Chevy S-10 4X4 Blazer
2015 Harley FLHTCUTG
03 GMC 3500 Dump
87 Pontiac Trans AM GTA


 
LMC Trucks
2plus2 
Member
Posts: 1089

Loc: Mission,BC
Reg: 02-03-05
01-03-18 11:58 AM - Post#2719887    
    In response to bikernut

Most codes will clear after 3 warm up cycles
So engine cold,fully warmed up,cold again and repeat


69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
07 Town Car Loaded,Tinted,Getting Bagged


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2281

Age: 31
Loc: Utica ny
Reg: 04-13-10
01-03-18 08:00 PM - Post#2719934    
    In response to 2plus2

simple answer is no.
Been there done that.
My customers call me all the time. word for word.
My car needs inspection.
(is the light on?)
Yes.
There is no way to clear the code unless it goes into history on its own. Sometimes even if it is in history it may still fail inspection.
Here In NY we get only 10 days from fail date and that is only under certain conditions.
Had to drive many illegal cars because of that.
They have to be driven to pass drive cycle and inspection.
I imagine as a licensed inspector I would be ok, but for someone else you drive it at your own risk. The operator takes fault.
Hopefully law enforcement is not too crazy about checking them.

Old School GM fan FOREVER


Edited by rockfangd on 01-03-18 08:05 PM. Reason for edit: No reason given.

 
bowtie44s 
Valued Contributor
Posts: 3812
bowtie44s
Age: 35
Loc: wv
Reg: 08-29-12
01-03-18 09:42 PM - Post#2719939    
    In response to bikernut

What was the code? You can turn the light off with a $20 code reader unless I am missing something here.

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2281

Age: 31
Loc: Utica ny
Reg: 04-13-10
01-04-18 06:55 PM - Post#2720041    
    In response to bowtie44s

member wants to clear the code without clearing the monitors.
I might add that although not related if the code is on another module than the pcm it will not affect the drive cycle

Old School GM fan FOREVER


Edited by rockfangd on 01-04-18 06:56 PM. Reason for edit: No reason given.

 
454cid 
Frequent Contributor
Posts: 2471
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
01-04-18 10:34 PM - Post#2720063    
    In response to rockfangd

  • rockfangd Said:
member wants to clear the code without clearing the monitors.
I might add that although not related if the code is on another module than the pcm it will not affect the drive cycle



I guess I don't understand either.... monitors? I can clear active codes, and clear history. Do you mean the tech is going to know the code has been cleared with a scanner, because of the lack of history?

My experience is mostly with my own truck which is a GMT-400 with the older PCM, not whatever the GMT-800 uses.

99 K3500 RCLB


Edited by 454cid on 01-04-18 10:36 PM. Reason for edit: No reason given.

 
rockfangd 
"4th Year" Gold Supporting Member
Posts: 2281

Age: 31
Loc: Utica ny
Reg: 04-13-10
01-05-18 07:43 PM - Post#2720170    
    In response to 454cid

When you clear the codes it resets the monitors.
there is no way to clear just one code, it is either all or none.

Old School GM fan FOREVER


 
Shepherd 
Frequent Contributor
Posts: 1047

Loc: Lake George, NY
Reg: 11-11-15
01-06-18 06:03 AM - Post#2720195    
    In response to rockfangd

The confusion here may be the fact that all the emissions function monitors go off line when clearing the codes, fixed or not, and on some vehicles it can take take a lengthy drive cycle for them to reset, you are allowed on 2002 or newer, for one monitor still not on and it will pass inspection.



 
Rick Dorion 
"4th Year" Gold Supporting Member
Posts: 240
Rick Dorion
Loc: Ulster County, NY
Reg: 09-21-12
01-06-18 07:36 AM - Post#2720208    
    In response to Shepherd

If the code is for the cat and one other I can't remember right now, it takes (5) drive cycles. The cycle only is counted when the initial start is with a cold engine. It can take 100 (or more miles). I went through this recently with my 06 truck and monitored with software on a laptop. Interesting (not) experience.

1967 Belair - perfect floor, frame and pinchwelds. Oh boy.


 
bowtie44s 
Valued Contributor
Posts: 3812
bowtie44s
Age: 35
Loc: wv
Reg: 08-29-12
01-06-18 07:51 AM - Post#2720212    
    In response to Shepherd

  • Shepherd Said:
The confusion here may be the fact that all the emissions function monitors go off line



I don't live in a state that does smog, but here they just look at the dash to see if you have any lights on. If he clears the trouble codes, what else is lost?

Jeff

'88 Chevy K3500, aluminum head roller cam 511in³ stroker 10.5:1 compression, 96 NV 4500, 94-98 grille, 305/70-16 (33x12) BF Goodrich KM2s, 91 cluster swap


 
Shepherd 
Frequent Contributor
Posts: 1047

Loc: Lake George, NY
Reg: 11-11-15
01-06-18 09:46 AM - Post#2720218    
    In response to bowtie44s

What lost is the emissions monitors, such as o2, evap, cat, egr, misfire and others if so equipped, they require the drive cycle to bring them back online, if a state that does an emissions obd11 test, it will fail until these are restored.



 
454cid 
Frequent Contributor
Posts: 2471
454cid
Age: 44
Loc: West Michigan
Reg: 02-18-12
01-06-18 12:19 PM - Post#2720226    
    In response to Shepherd

  • Shepherd Said:
The confusion here may be the fact that all the emissions function monitors go off line when clearing the codes, fixed or not, and on some vehicles it can take take a lengthy drive cycle for them to reset, you are allowed on 2002 or newer, for one monitor still not on and it will pass inspection.



Then why do codes come right back, if the code was cleared, but the problem wasn't fixed?


99 K3500 RCLB


 
Shepherd 
Frequent Contributor
Posts: 1047

Loc: Lake George, NY
Reg: 11-11-15
01-06-18 01:59 PM - Post#2720246    
    In response to 454cid

The issue with the emissions monitors being reset is not directly related to uncorrected failure codes in the pcm. If the problem is not corrected the codes come back after being cleared.if the codes are not related to the emissions system, the pcm doesn't have to wait on the monitors coming back online, there are exceptions to this of course.




Edited by Shepherd on 01-06-18 02:01 PM. Reason for edit: No reason given.

 
wagonman100 
Super Senior Member
Posts: 13931
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
01-06-18 02:11 PM - Post#2720249    
    In response to 454cid

It's not that the codes come back, though they will if the code is cleared without the problem being fixed, it's that they can tell that the code was cleared very recently and the vehicle hasn't been driven much. Therefore the code may have been cleared right before taking it in for inspection and the problem not fixed and not been driven enough for the code to come back. That's why they want drive cycles to show up after the code has been cleared. It "proves" that the problem that made the code show up has been fixed. Though I did turn out the light on my brother's old truck and he took it right in to be tested and they passed it, though they shouldn't have. The person must not have noticed the lack of drive cycles after the code was cleared.

My truck used to set a small evap leak code with every 1/4 tank of fuel usage, so when my inspection came due I would fill the tank, clear the code and make sure I put gas in it every couple of days to make it so it didn't get down to 3/4 tank and set the code.

You may be able to get another extension if you call and explain the situation. It can't be something they've never dealt with before, so they should have a reasonable, legal solution.

Jay
Some days it's not worth chewing through the restraints.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon


 
Shepherd 
Frequent Contributor
Posts: 1047

Loc: Lake George, NY
Reg: 11-11-15
01-06-18 03:45 PM - Post#2720263    
    In response to wagonman100

The only way to tell if the codes were cleared or battery disconnected was the fact that the monitors were not online, there is no record of prior codes doing this. To make it clearer, think of the pcm starting from zero.



Edited by Shepherd on 01-06-18 03:46 PM. Reason for edit: No reason given.

 
someotherguy 
Moderator
Posts: 28464
someotherguy
Age: 47
Loc: Texas
Reg: 08-01-03
01-07-18 02:21 AM - Post#2720300    
    In response to Shepherd

I've had a number of OBD2 vehicles inspected and if the CEL works (comes on at key-on) but is not on while running, they didn't even hook up to see anything else.

On the other hand, one that has already failed and is coming back for a re-test, I wouldn't be surprised if they hooked up to see. The emissions readiness monitors are a pretty obvious go/no go on the inspection.

You can learn a bit more about the whole subject by simply googling "emissions readiness monitors"

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
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