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Service engine soon light on?

Tiny
TBONE313
  • MEMBER
  • 1999 GMC JIMMY
  • 160,000 MILES
Service engine soon light on 99 GMC Jimmy, why would it come on and does it give a code since it's not a check engine light and I want to get rid of it.
Saturday, October 15th, 2011 AT 4:11 PM

18 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,505 POSTS
Yep it sounds like you have a oxygen sensor heater that is out which is the most common problem for a check engine light. Here is a guide to show you what you are in for when doing the job.

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

here is a guide to help you get the codes to confirm.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please let us know if you need anything else to get the problem fixed.

Cheers, Ken

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Saturday, October 15th, 2011 AT 4:46 PM
Tiny
TAMMIEK
  • MEMBER
  • 1 POST
  • 1999 GMC JIMMY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 140,000 MILES
I recently changed the battery in my Jimmy. Soon after my service engine soon light came on and stayed on. What could cause this and how do I reset the light. I have already tried disconnecting the battery cables. That did not work. It runs great.
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The computer has identified a problem within the engine management system -You need to pull the OBD2 code/s from it and comeback with the code/s this the starting point of the diagnosis
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
MORPH1
  • MEMBER
  • 2 POSTS
  • 1999 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 75,000 MILES
I live in northern part of Canada, Alberta,
Recently it has been very cold over one night in the morning it was -36 celsius, well that morning I drove to work, everything was fine with my Jimmy,
on the way back the Engine Light came on,
the car is working perfect but the engine light stays on, the fuel cap in the tank is tight so thats not a problem, someone told me that it could be the catalitic converter.
Could anyone suggest anything,
could that be the cold weather messed up the sensor?
The car has always been mainteined with oil changes and all the maintenance necesary?

Thanks ahead for the replies.
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
TRUCKCHEVY4
  • MEMBER
  • 23 POSTS
Try reseting the system if it comes back on then a sensor is bad you reset it by unhooking the negative for about 10 minutes that should do it if light comes back on get a diagnostic reader to check it out.
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
MORPH1
  • MEMBER
  • 2 POSTS
Hi, thanks for the reply, I was booking a service to get the vehicle checked and then on the 3rd day the light just turned off? Lol I think it could be condensation in the gas tank as I was almost empty and it was -35 here that day.
I was told I am supposed to be at at least half a tank in that cold, maybe that had an effect on the sensor.

Cheers!
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
ANDREW8090
  • MEMBER
  • 1 POST
  • 1999 GMC JIMMY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 91,000 MILES
How do you turn off the Service engine soon light?
Is this light just a reminder to get you to take it to the dealer?
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
DAVE H
  • MECHANIC
  • 13,384 POSTS
SELF-DIAGNOSTIC SYSTEM
The PCM is equipped with a self-diagnostic system which detects system failures or abnormalities. When a malfunction occurs, PCM will illuminate the Malfunction Indicator Light (MIL) located on instrument cluster. When a malfunction is detected and MIL is turned on, a corresponding Diagnostic Trouble Code (DTC) will be stored in PCM memory. Malfunctions are designated as either "emission related" or as "non-emission related", and are divided into 4 code types to identify type of fault. The 4 code types are defined as follows:
Type "A"

Emission related faults that illuminate MIL at first occurrence of a fail condition.
Type "B"

Emission related faults that illuminate MIL if a fault occurs in 2 consecutive ignition cycles.
Type "C"

Non-emission related faults that illuminate MIL only when fault is present. MIL will turn off 3 seconds after engine start if fault is no longer present, but a record of fault will remain stored in memory.
Type "D"

Non-emission related faults which do not illuminate MIL.
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-1
Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
KEVIN MASSERANT
  • MEMBER
  • 3 POSTS
  • 1999 GMC JIMMY
Transmission problem
1999 GMC Jimmy 6 cyl Four Wheel Drive Automatic

i have recently rewired a 99 gmc jimmy at the power dist. Block and at the pcm. I used the mitchall manner diagrams. I have cheked all the wires three times and i'm still having problems with the torqueconverter locking up as soon as it shifts out of 1st gear going into 2nd. The speed sensor calls for 5volts and I am only getting 0.64volts. I have replaced the pcm and still have the same problem.I have scanned it for troble codes but come up with nothing. The "check engine" light gos off like it is supossed to. The engine runs fine. Where does this problem sound like it may start
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,911 POSTS
Hi:

It sounds like the speed sensor is bad, or you have a broken wire. Did you replace the speed sensor?

Joe
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
KEVIN MASSERANT
  • MEMBER
  • 3 POSTS
Hi Joe
This is the guy with the 99 gmc jimmy again. I have put my scan tool (Actron Elite Auto Scanner CP9185) it seems to communicate with all systems and it tells me no faults detected. I have also checked the speed with the scanner and it matches the speedometer with scan tool in drive mode. I got 4.0-5.0 volts at the VSS I would think that the VSS checks out to be ok. The wiring harness has been taking out of the jimmy and checked with a continuity by digtial meter and couldn;t find any broken or crossed wires. Every thing in the jimmy works, except for this shifting problem. Any ideas about pusle width module but it seems like a DTC code would make the light come on. Im out of ideas. PLEASE HELP.
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,911 POSTS
Hi:

I reviewed your original question and it indicates that you're only getting 0.64 volts and should be getting 5 volts. Is that in or out? Is there any way you find a different one just to try? Not being there with you is making this even harder, but I truly question if that is what is causing your problem. Regardless, I don't want you to spend the money and it not fix the problem.

Let me know what you think and get back to me. While you think of that, I will contact some of the other moderators and get their opinion. WE WILL FIGURE THIS OUT!

Joe
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Which sensor exactly is only getting.64 volts?
Are you positive which ever sensor it is, is located at the correct pin at the PCM? If the wire checks out ok, that is the first thing that comes to mind. Especially if the PCM has been changed
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
JACOBM
  • MEMBER
  • 1 POST
  • 1999 GMC JIMMY
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 161,000 MILES
While sitting still my truck runs hot and the check engine light comes on. When driving the temp hand is really high. MY heater has stopped working. What could be the problem.
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
BILLYMAC
  • MECHANIC
  • 2,204 POSTS
Need to pressure test cooling systems to find leaks. If no leaks reolace t stat check fan clutch you should to be able to turn fan freely with eng off. If not clutch is bad good luck billymac
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Disconnect the TCC solenoid and see what happens-also test the brake switch and the TPS sensor
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
JNOVACK
  • MECHANIC
  • 723 POSTS
The Transmission Control Solenoid has alot to do with Torque Converter lock up can you test this and let us know what you get from test
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)
Tiny
KEVIN MASSERANT
  • MEMBER
  • 3 POSTS
Hi Joe
Here I am back with the same 99 Gmc Jimmy with the same shifting problem. I have sent the Jimmy to Amco transimissons & he put it on his trans scanner on it and he told me that mechanically the tranny was ok. I have checked the vss, iss and the oss and all three sensors will give me ac signal back to the pcm. With the rear tires off the ground in drive running about 15 mph I have checked for 5 volts at the vss and also the pcm plug and all I have is.64 volts so I jumped 5 volts from the reference wire off of the mass air flow sensor to the vss and still same problem I have been told by one person that it calls for 5 volts and another person said it called for 12 volts. What voltage does the vss call for and is there any reason for the pcm to only give me.64 volts on the vss signal wire. The tps seems to be operating smoothly on the scanner I also put a new brake switch on and still no difference. All circuts to each of these sensors have convity back to the pcm. I am ready to shoot this jimmy and get it over with. Do you have any more ideas if you do please help iam running out of ideas on this truck
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Sunday, January 5th, 2020 AT 1:48 PM (Merged)

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