How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Hal Your Own Question

Hal
Hal, Chevy Master Tech
Category: Chevy
Satisfied Customers: 1020
Experience:  ASE and Chevy Master , 31yr Dealership exp,
Type Your Chevy Question Here...
Hal is online now
A new question is answered every 9 seconds

Just changed a coil pack on my 2003 Chevy Silverado vortec

Resolved Question:

Just changed a coil pack on my 2003 Chevy Silverado vortec 5.3L engine and now the service engine light in on. Did it drop a code just because I changed something electrical and it just needs to be reset and is nothing major?
Submitted: 4 years ago.
Category: Chevy
Expert:  Hal replied 4 years ago.

Hi my name isXXXXX to just answer.

 

Just changing the coil should not have set a code. or need reseting unless the light was on before you changed the coil. A code scanner is needed to check and clear trouble codes on this vehicle.

I would need to know what code is stored to be able to tell you how to repair it.

It could be as simple as a connector not getting plugged back in.

Go over all the wire connectors and make sure they are all seated properly.

The light may take two or three drive cycles before it turns off, if you do find a connector disconnected.

If you find out what code has set let me know and I will help you diagnose it.

 

Thank you

HAL

Customer: replied 4 years ago.

The light wasn't on before I changed the coil pack. I even unplugged the red cable on my battery and left it off for about 5 mins and it didn't reset. I plugged the spark plug wire back in and the plug into the coil pack. Should I unplug the wires and reconnect them with the battery disconnected?

Expert:  Hal replied 4 years ago.

These don't reset by disconnecting the battery. A code scanner is the only way to clear them. If the concern is no longer there for two consecutive drive cycles, then the lamp will turn off.

It is best to have someone see what code is set. If it was missing then it will be a P0300 or P03xx for the cylinder that the coil was replaced for( P0301-P0308)

OBD 2 vehicles are not capable like the OBD 1 vehicles were to reset with disconnecting the battery.

If you need more information, let me know

Thanks

HAL

Hal, Chevy Master Tech
Category: Chevy
Satisfied Customers: 1020
Experience: ASE and Chevy Master , 31yr Dealership exp,
Hal and 8 other Chevy Specialists are ready to help you
Customer: replied 4 years ago.
The engine is missing on cylinders on 3,5,7 and I changed the one for 5. I planned on getting a code reader on it tomorrow but was just seeing if there was anything I could possibly do to get it fixed tonight. The engine light being on bothers me. Thanks for your help!!

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
< Last | Next >
  • http://ww2.justanswer.com/uploads/TI/tim37857/2011-10-28_23053_S6301814.64x64.JPG Tim's Auto Repair's Avatar

    Tim's Auto Repair

    mechanic

    Satisfied Customers:

    7641
    Have owned a repair shop for 25 yrs.
  • http://ww2.justanswer.com/uploads/DT/dt69nova/2012-6-15_234154_pic1.64x64.jpg Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    6870
    ASE Master Certification. GM World Class Certification
  • http://ww2.justanswer.com/uploads/ggrote1/2009-06-27_031011_me.jpg Gary's Avatar

    Gary

    Chevy Technician

    Satisfied Customers:

    5404
    15 years GM master tech
  • http://ww2.justanswer.com/uploads/testedtuff/2009-09-26_170108_pictures.jpg John's Avatar

    John

    Master A.S.E Automotive technician

    Satisfied Customers:

    4071
    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • http://ww2.justanswer.com/uploads/RO/rodcuda/2011-7-25_224114_Donhoff1.64x64.JPG Neal's Avatar

    Neal

    Chevy Mechanic

    Satisfied Customers:

    2306
    Shop Owner and Mechanic on multiple makes.
  • http://ww2.justanswer.com/uploads/goodwrench9124/2008-11-09_220838_dscf0007.jpg goodwrench9124's Avatar

    goodwrench9124

    ASE Certified Technician

    Satisfied Customers:

    2041
    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • http://ww2.justanswer.com/uploads/DR/drivefast1971/2012-1-12_172422_0009051tQKh.64x64.jpg Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    1912
    18+yrs experience. State Inspector and Chevy Diagnostics