Question about 1991 GMC Sierra

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Service engine soon light is on. - 1991 GMC Sierra

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Hi, you will need a obd-1 code reader connected to the PC to find out what the code is. Here is your best bet and will save you $$$. Drop by a Auto-Zone parts store, and they will bring there meter out, plug it into your PC, and run it through for free. It will tell what brought the light on and can be erased if its not a hard code but a soft one will. It may just be a emission problem. They will give you a long readout from there computer inside that lists most all codes for this GMC, so you no what is going on and need to do. I have done this 2 times on my Chevy truck! Works great for free!! Please rate me as I know you will be kind. This will solve your problem.
Sincerely,
Shastalaker7

Posted on Aug 30, 2010

  • Robert Horton
    Robert Horton Aug 30, 2010

    Thank you for the awesome rating. I am happy that I could be of help to you on this as it will work out for you. Thank you for using Fix-Ya.com.
    Shastalaker7

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What does the service engine light mean on a 2015 Ford Edge


Service Engine Soon

If the Service Engine Soon indicator light stays lit after you've started the engine, the On Board Diagnostics system (OBD) has detected a malfunction of the vehicle emissions control system. Contact your authorized dealer as soon as possible.
If indicator light is blinking, an engine misfire may be occurring, which could damage your catalytic converter. Drive in a moderate fashion (avoid heavy acceleration and deceleration), and have your vehicle serviced immediately.*
The Service Engine Soon indicator light illuminates when the ignition is first turned on (prior to engine start) in order to test the bulb, as well as indicate whether the vehicle is ready for Inspection/Maintenance (I/M) testing.
Normally, the Service Engine Soon light will stay on until the engine is cranked, then turn itself off if no malfunctions are present. However, if after 15 seconds this light blinks eight times, it means that the vehicle is not ready for I/M testing.Check this link out Gary.
https://owner.ford.com/how-tos/vehicle-features/dashboard-instrument-cluster/warning-lamps-and-indicators.html

Jul 19, 2017 | Ford Cars & Trucks

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Service engine soon light


A service engine soon light that flashes generally results form an ignition problem with the engine. A service engine soon light that stays on constant results from an emission control system malfunction. A diagnostic scan from the local parts store can determine which emission system is faulty.

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I have a 2001 mustang bullitt that is showing service engine light on. Took it to mechanic and he put 2 different machines on it to show code for problem. No codes coming up and he can't turn off the...


There is a diagnostic procedure in the factory service repair manual for engine light lit ,no codes . Did you take it to ford dealer ? MIL - is referring to check engine , service engine soon etc...
  • MIL always on when engine is running (no DTCs):
  • MIL circuits
  • For Focus, Mustang, Town Car, Continental, LS6/LS8, Escape, Windstar, F-150, Expedition and Navigator/Blackwood:
  • Instrument Cluster, Section 413-01 of the Workshop Manual.
  • All Others:
  • GO to NB1

SERVICE ENGINE SOON indicator After the engine is started, the SERVICE ENGINE SOON indicator will prove out for a duration of three seconds. If the instrument cluster does not receive a message from the PCM within five seconds, the instrument cluster will illuminate the SERVICE ENGINE SOON indicator and log a diagnostic trouble code (DTC).

  • An indicator is inoperative/always on - SERVICE ENGINE SOON
  • Circuitry.
  • Bulb.
  • Instrument cluster.
  • PCM.
  • GO to Pinpoint Test P .

PINPOINT TEST P: AN INDICATOR IS INOPERATIVE/ALWAYS ON - SERVICE ENGINE SOON CONDITIONS DETAILS/RESULTS/ACTIONS P1 CARRY OUT THE INSTRUMENT CLUSTER SERVICE ENGINE SOON INDICATOR ACTIVE COMMAND Trigger the HEC active command MIL.
  • Did the SERVICE ENGINE SOON indicator illuminate?
Yes REFER to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

No INSTALL a new instrument cluster; REFER to Instrument Cluster . CLEAR the DTCs. REPEAT the self-test.

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Service engine soon light


The service engine soon could be an indicator that you need to have minor maintenance done in the near future. I had a Grand Am that the service engine light would turn on when I was getting close to needing an oil change. You might check your owners manual for an exact reason as to why it turns on.

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Lincoln town car + service engine soon


Service engine soon has nothing to do with service or maintenance . Emission's OBD 2 engine managment system . Light on ! DTC'S - diagnostic trouble codes stored . Your don't know THAT ! Your best bet , take it to the dealer .

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"service engine soon" light on


should have two lights check engine and service engine soon.check engine means there is a malfunction.service soon is reprogrammable,when you change you oil. check you owners manual for reset.

Dec 04, 2010 | 2001 Buick Century

1 Answer

Print out says service engine soon is that the same as the check engine light


service engine soon is a warning that you are due a service"soon"the check engine light is a warning that several things could be wrong and a diagnostic is advisable.

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I have a 2001 Oldsmobile Alero. What does it mean when the anti brake light, service engine soon, and traction off light comes on at the same time?


I am assuming its not the service engine soon light it is probably the service vehicle soon light, There are 2 lights service vehicle soon upper left side, and service engine soon upper right side.

When all these come on at the same time it is the wheel bearing sensor. Usually the wheel bearing needs to be replaced which houses the sensor. A sure way to check is to press your sls button by your shifter and see if the light goes out, If it does not, u will need to have a wheel bearing put in.

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Two service engine lights


one is service engine soon referring to the engine and trans. systems, and one is service vehicle soon, referring to body, abs, hvac, etc. systems two different lights for 2 different types of trouble codes

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Dies when started cant find check engine light


The service engine light is the check engine light. Different name for the same thing.

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