getting the codes

skills4lou · January 12, 2006

My "new" 98 K3500 C/C has developed an intermittent SES light issue. Pretty sure it's related to fuel, but want to check the code anyway. Which terminals do I jump and what's the procedure for reading the code?

On my 94 it's just jump two terminals and turn the key on, then count the flashes on the SES light. Is the 98 the same? Thanks!

90GMCZ71 · January 12, 2006

My "new" 98 K3500 C/C has developed an intermittent SES light issue. Pretty sure it's related to fuel, but want to check the code anyway. Which terminals do I jump and what's the procedure for reading the code?
On my 94 it's just jump two terminals and turn the key on, then count the flashes on the SES light. Is the 98 the same? Thanks!

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Your 98 is OBD-II (all 96 vehicles and newer are OBD-II) and you can no longer jumper two terminals to get the codes. You need an OBD-II code reader or scanner.

I have heard that Autozone will do it for free but I have not tried that.

//90GMCZ71

skills4lou · January 12, 2006

Ah nuts! I'll call autozone later and check. Thanks!!

Rick Dorion · January 12, 2006

Ah nuts! I'll call autozone later and check. Thanks!!

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I've had better look going to my local garage and having them pull the code. If you have a relationship with one it may be free. I had Autozone pull codes and they gave me incorrect information. If you go to Autozone, get the code from the reader and double check the meaning.

skills4lou · January 13, 2006

I just remembered that I can take it to the auto hobby shop on base (USAF) and they'll read the codes for free. I think that's what I'll do. The truck is still running just fine, and the light just seems to go on and off at random. I'll let y'all know what I find.

G

swilliams1005 · January 14, 2006

I just remembered that I can take it to the auto hobby shop on base (USAF) and they'll read the codes for free. I think that's what I'll do. The truck is still running just fine, and the light just seems to go on and off at random. I'll let y'all know what I find.
G

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What motor due you have and have you installed a K & N replacement filter,, Reason for asking every since i have installed the K & N Filter some oil got on the mas air flow sensor and has caused my check engine light to come on.

skills4lou · January 15, 2006

98 Chevy K3500 CC/LB, 7.4/4L80E/4X4

Update: The codes came back a P0172 and P0175, Left and right banks both running rich. So, I'm thinking it's either some injectors leaking/not shutting off completely or the new fuel pressure regulator is leaking.

I bought a fuel pressure guage, but haven't had a chance to use it yet. I go back out to work Sunday and won't make it home until Thursday, so any more diagnosis will have to wait until then......

swilliams1005 · January 15, 2006

Sounds exactly what mine is doing and same codes still havent found problem and have changed all kinds of things nothing so far has fixed problem.Only thing left is the mas air flow sensor

skills4lou · January 20, 2006

Well, the wife drove the truck around this week a few times while I was at work, and I drove it a while today. No SES light, so maybe the fix worked. I bought a couple bottles of Lucas Oil fuel injector cleaner and am running them through the system. Time will tell. Tomorrow I'm gonna hook the fuel pressure gauge up and do a good pressure/leak test.

iracekx · June 27, 2006

Well, the wife drove the truck around this week a few times while I was at work, and I drove it a while today. No SES light, so maybe the fix worked. I bought a couple bottles of Lucas Oil fuel injector cleaner and am running them through the system. Time will tell. Tomorrow I'm gonna hook the fuel pressure gauge up and do a good pressure/leak test.

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Did you ever come up with anything I am having the same problems you can look at my post trouble code P0175 and see if you had these problems Thanks in advance.

swilliams1005 · June 30, 2006

Well, the wife drove the truck around this week a few times while I was at work, and I drove it a while today. No SES light, so maybe the fix worked. I bought a couple bottles of Lucas Oil fuel injector cleaner and am running them through the system. Time will tell. Tomorrow I'm gonna hook the fuel pressure gauge up and do a good pressure/leak test.

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Did you ever come up with anything I am having the same problems you can look at my post trouble code P0175 and see if you had these problems Thanks in advance.

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I looked at you other post and ive done everything i know to do even replaced regulator and didnt help as far as the code P0175 goes,,, mine didnt start till i put in a K&N filter and been doing it every since and it dosent affect the running of vehicle.