1AERK00112-6 Piece Ignition Coil Set


2005 Chevrolet Trailblazer L6 4.2L 6 Piece Ignition Coil Set

Guaranteed to fit: 2005 Chevrolet Trailblazer

Fit Details

  • Engine Displacement (Metric): L6 4.2L

Part Details

  • Set Quantity: 6 Piece

This part replaces:

  • TRQ ICA61531
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List: $193.95 Save: $29.00
Part 1AERK00112

Out of Stock



Brand #: ICA61531
Vehicle Fit
Warranty & Shipping
How-To & Tools

Part Details

  • Set Quantity:   6 Piece

The ignition coil is a crucial part of your ignition system. It's function is to convert the 12 volt power of your vehicle's electrical system in to 35,000 or more volts. This produces a high intensity spark at the spark plug which then ignites the fuel in the cylinder. Coils in general will wear out over time. This will cause a misfire condition. In engines like this with one coil per cylinder you can diagnose a coil by putting a timing light on each one to make sure it is lighting the light consistently.

This Coil Over Plug Ignition Coil features the following specifications:

  • Comes as a SET:
    • Includes Six (6) Coils
  • Brand New
  • Replaces dealer part number: 88958974
  • Built to strict quality control standard
  • Direct replacement
  • 100% factory tested

These coils are for a distributorless application. Sold as a SET of SIX. Please see our other listing if a single coil is needed.


Our electrical and electronic parts are subject to strict quality testing.

Parts cannot be returned after they have been installed. Contact us with any questions before installing the parts.

Direct Fit Replacement

Guaranteed to fit and function properly for your specific application.

Optimum Performance

Meets or exceeds requirements of the vehicle. Provides the correct primary and secondary resistance, voltage output, and spark energy needed to restore original operating condition.

Premium Quality

Manufactured with quality materials to meet highest quality control standards in the industry.

Item Condition: New

Lifetime Warranty

This item is backed by our limited lifetime warranty. In the event this item should fail due to manufacturing defects during intended use, we will replace the part free of charge. This warranty covers the cost of the part only.

  1. step : Removing the Air Intake Box (0:57)
    • Remove the two 8mm bolts holding the top of the air box
    • Remove the two hose clamps with a flat blade screwdriver
    • Twist and remove the two vacuum lines
    • Pull the air intake box up and out
    • Twist the air intake hose collar off
  2. step : Removing the Ignition Coil (2:45)
    • Disconnect the locking tab with a flat blade screwdriver
    • Disconnect the ignition coil wiring harness
    • Remove the 10mm bolt from the engine coil
    • Pull the ignition coil up and out
  3. step : Installing the New Ignition Coil (3:59)
    • Insert the ignition coil into place
    • Insert and tighten the 10mm bolt
    • Connect the ignition coil wiring lead
    • Replace the locking pad
  4. step : Installing the Air Intake Box (5:01)
    • Twist the air intake hose collar into place
    • Insert the air intake box into place
    • Insert the two vacuum lines
    • Insert and tighten the two hose clamps with a flat blade screwdriver
    • Insert and tighten the two 8mm bolts holding the top of the air box

Tools needed for replacement:

    Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket
  • 8mm Socket

Need help? Ask one of our Auto Experts
Need help? Ask one of our Auto Experts
Customer Q&A
Ask a question to 1A Auto customers who purchased the product
Who is the manufacturer?
Gary W August 29, 2016
Generic no name but I havent had any problems with it still running strong almost 3 years
Nina N August 29, 2016
1A Auto
Andre J August 30, 2016
Do not see any markings on the part - the box references Vendor #V0193, so maybe you can ask 1A Autos customer service to look it up? Sorry I couldnt be of more help.
Lynn H August 30, 2016
We have a few different aftermarket companies build these parts specifically for us, as our 1A Auto house brand. They are manufactured to the same OEM specifications as the original part that came with your vehicle. If you have any further questions, please dont hesitate to ask.
Brian F August 30, 2016
i will try and locate some info this weekend at the moment i dont know
Richard C August 30, 2016
Not sure...i no longer own the truck...
Demetrius J August 31, 2016

Fits the following Makes:

Year Make Model Description
2004-2005Buick Rainier Buick Rainier L6 4.2L 6 Piece Ignition Coil Set
2002-2005Chevrolet Trailblazer Chevrolet Trailblazer L6 4.2L 6 Piece Ignition Coil Set
2002-2005Chevrolet Trailblazer EXT Chevrolet Trailblazer EXT L6 4.2L 6 Piece Ignition Coil Set
2002-2005GMC Envoy GMC Envoy L6 4.2L 6 Piece Ignition Coil Set
2002-2005GMC Envoy XL GMC Envoy XL L6 4.2L 6 Piece Ignition Coil Set
2004-2005GMC Envoy XUV GMC Envoy XUV L6 4.2L 6 Piece Ignition Coil Set
2003-2005Isuzu Ascender Isuzu Ascender L6 4.2L 6 Piece Ignition Coil Set
2008Isuzu Ascender Isuzu Ascender L6 4.2L 6 Piece Ignition Coil Set
2002-2004Oldsmobile Bravada Olds Bravada L6 4.2L 6 Piece Ignition Coil Set
2005Saab 9-7X Saab 9-7X L6 4.2L 6 Piece Ignition Coil Set
Brand #: ICA61531
Product Reviews
4.82/ 5.0
55 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
My truck is running like a new truck! I have ordered parts from here more than once
January 28, 2017
Ignition coils
These coils are very similar to the factory originals. I was able to remove the old ones, change the plugs and install the new ones in just over an hour. I matched them with iridium plugs and my gas mileage increased by a couple miles per gallon. No sputtering when hitting the throttle, quick and easy start-up and backed by a very nice warranty. Overall, very happy with my purchase and look forward to not having to replace this part for many years to come. What more can I say, quality at an affordable price. Doing business the way it should be done. Great job A1 Auto.
April 24, 2017
This was a great purchase, parts all went in as they stated and the video made it easy to save the 300 dollars they wanted to put them in. I would highly recommend if you are handy that you try 1aauto for your next repair, shipping was free and parts came earlier than they said.
June 28, 2017
Quality product
Quick shipping.. excellant Customer service.. product exactly as described.. definitely will shop again!
July 2, 2017
Made my truck run brand new
I got these coils replaced in like 30 mins with common hand tools and now my truck runs brand new, the engine runs a lot smoother and my gas mileage is better. Also for only 119.95 and you get 6 coils!? That is a crazy good deal, I will definitely be buying more parts from here.
August 1, 2017
Great Service
The coil pack for my 2004 GMC Envoy shipped on time, great product and it runs great again. I also enjoyed the videos they produce.
August 3, 2017
August 24, 2017
The coils I bought from 1 A Auto was a perfect match. The were also much cheaper than an auto parts store.
November 21, 2017
Just what I needed
Exact match and easy to install. Product arrived quickly.
December 27, 2017
Fired Up !!
This is the best deal on the internet. These ignition coils are just like the originals. they fit perfect. also they have my chevy Trailblazer purinning like a kitten. Thanks 1A Auto. Qball901 from Memphis,TN.
January 29, 2018
Great Purchase
My wifes car runs like it was new. I have recently started buying auto parts online and I dont know why I waited this long to do it. Thanks 1a auto.
February 5, 2018
Customer Satisfaction
I love this company. They truly believe in making their customers feel as if nothing else matters at that time. I did have a issue that was taken care of right away and thanks to Joshua it all was resolved. I will continue to be a return customer for the quality parts and the customer service that sets this company apart from the rest. God bless. Mark R. Fairfield twp. Oh.
February 5, 2018
Work real good took less a hour to install,solve half the problem ,no more misfiring,might have the timing checked,injectors ckeaned
March 12, 2018
Great price for 6 coils. Installed without an issue and work perfectly. Will be making more purchases from 1A Auto in the future.
March 16, 2018
omg the best i have my car running beautiful it ride better then it ever did i took it out of town this past weekend it was awesome on the road i’m so glad to know about this company
March 28, 2018
Love it
I love this site and I will be using it more often
April 16, 2018
Purchase of Coil packs
I would just like to say that my purchase was delivered in a timely manner and it was exactly the parts I ordered so I Would highly recommend 1aauto ...
May 2, 2018
May 21, 2018
Worth every penny!
I was skeptical on this purchase, but i took a chance and wow! This product fit perfectly and worked just as good as factory. This is the start of a good relationship between me and 1A auto. Also on another note, I really enjoy the YouTube videos they produce, not only selling the product, but having a step by step on how to fix it
August 10, 2018
03 envoy coil packs
These were a fraction of the cost from autozone. The parts are nearly identical to the factory ones I replaced. The fitment was exact. I wasnt experiencing a misfire, but I knew the 4.2 had an issue with failed coils so I replaced the coils and plugs proactively. Therefore, I cant say that my SUV runs any better, but I did see fuel mileage increase. Shipping was fast and free.... thats always nice too.
August 26, 2018
Ignition Coil
I’m so pleased with the coils. They were very easy to install. I will continue purchasing car parts from 1aauto and will refer and invite others to purchase from here. Thank you!!!
September 7, 2018
The best costumer service
These guys are the best!! They solved my problem in no time.
September 11, 2018
Great product and perfect fit to tune up your Trailblazer
I would highly recommend these coils as they were a perfect fit and excellent quality replacements for the originals at a much better price. Install was a snap thanks to the 1A Auto videos and it brought new life to my old 2004 trailblazer. Shipping was super fast and customer service is always great!
October 2, 2018
Worked perfectly
Bought them after reading the reviews. Was not disappointed. The coil packs fit perfectly. No problems with the clips not fitting. My 2004 Envoy runs great again.
October 26, 2018
Good for the cost
the fit good. works okay but not great for pick up. My SUV is hesitating to accelerate above 65mph. I may have to get the branded parts to get the acceleration i was expecting to see. Over all good the cost i got.
November 5, 2018
Ignition Coils
Parts arrived on time one week later. Free shipping was great. All fit my car perfectly. Running like a new vehicle. Highly recommend 1A Auto.
November 7, 2018
Satisfied customers
As you can see, i keep coming back to order with this company. They are amazing! Thanks again for the informative videos. Satisfied
November 12, 2018
Solved my problem.
I was a little concerned with the much lower than OEM price on these, but all 6 worked with no issues and seem to be quality made. The misfire issues I was having have completely resolved and I am very happy with my purchase.
November 20, 2018
M? super trail blazer
this coil pack was affordable. made my trial blazing
November 23, 2018
Just what I needed
The coils were the right parts at the right price. Delivery and packing were good also. Ill buy again if and when I need to replace them.
December 20, 2018
Coil set
I love everything about this site. If I would have gone to the auto parts store I would have paid $65 to $70 each for one coil. Here I paid $122.95 for all six coils. My car runs great. This site saved me almost $270.
February 13, 2019
Great parts even better price fast delivery beat all competition by 100.00
February 17, 2019
A1 auto
Love them good place to get your parts
March 19, 2019
Very satisfied
Fast delivery, correct parts, good experience! Would use again.
March 26, 2019
replacement parts
This 6 pc set of ignition coils was exactly what I needed for my Envoy, running smooth again after replacing the plugs and coil packs. Thanks again
April 15, 2019
Great company
Got a great price with fast delivery. And when I needed assistance both times I ordered, customer service was friendly and thorough.
May 5, 2019
2003 Trailblazer Coils
As an independent woman, I try to work on my own vehicle as much as I can. I was a bit nervous of doing this work on my own, as it was my first attempt. The parts came and the video was incredibly helpful. My old beast is now purring like a kitten and I probably saved $500 or more by doing it myself. Thanks!!
May 6, 2019
Fast simple and easy
everything that I ordered came in fine one item did not show up so I made one phone call customer service is off the chain they are good.
May 12, 2019
Great product. Great price replaced all 6. Vehicle runs mint no problems better gas mileage would highly recommend thank you 1a auto
June 22, 2019
Great product and service
June 28, 2019
Excellent products and company
I have ordered several parts from 1aauto and have always been very satisfied. This company provides excellent customer service unlike other online parts sellers. The coil pack and spark plugs solved my Envoy performance problem. Price is substantially below part store pricing. Thanks
July 6, 2019
only guessing ecm couldnt read problem wich cylinder your replacement coils fixed the problem. THANK YOU !
July 7, 2019
recent order
I received all the parts very fast and everything fit perfectly. I am very pleased with this dealer and highly recommend them to everyone. Thank-you 1A Auto.
July 10, 2019
Perfect fit
August 19, 2019
Good Deal for 2005 Trailblazer EXT
I was pleasantly surprised with the quality of these coils. I could not tell the difference from the AC Delco other than the PRICE!!! I have had them installed for more than a month now and the vehicle is running great. I hope that they last as long as the originals because they lasted 196,000 miles.
August 21, 2019
Great service and great prices
September 5, 2019
ignition coils
The price for a six pack was what some parts stores wanted to charge me for one; for the same part! Excellent price, the parts fit like a glove and work properly. The ordering was easy to find the parts- ignition coils-for my trailblazer. They came a day earlier which was great, packed safely as well. Overall, great service.
September 16, 2019
Plugs and Coils
One coil went bad on an 05 Envoy w/127000 miles, so l decided to change all plugs and coils. The product arrived quickly. Only time will tell, but its been three weeks and all is well.
November 4, 2019
Replacement coils. Work great!
I had purchased a cheap set of coils to replace my oem ones..three of those after market coils failed within 4 months of install..ordered the trq coils from 1a to replace the replacements and so far...so good...no wierd wonky messages from my pcm now!!!! And engine runsuch smoother than it did.
November 14, 2019
very happy
I needed this product because I was going 200 miles one way and it came in time. thank you!!!
December 14, 2019
Very good product
Very good product
March 8, 2020
Perfect and affordable
I was able to replace all 6 coils for the price of 2 from a local store, they seem like theyre very good quality and my vehicle runs smoother than it ever has. Well worth the price
March 25, 2020
Great price beat auto zone and advance by a long shot. Delivered on time and great quality
May 5, 2020
Would not purchase again
1 damaged, 1 dead ignition coils have a bolt that is built into them. One of the six the bolt was bent and unable to be installed. A second one was completely dead and would not work at all.
May 18, 2020
2 of the 6 coils received were defective - i had to replace the spark plugs and then put my old coils on - i tried calling 1A but was on hold forever - went to return online but it was not the whole part, I am extremely busy right now so very inconvenient :( wish the packers would have checked the parts when putting them in the box as the sleeves were so loose
August 12, 2020
Customer service


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Saturday - Sunday 8:00am - 4:30pm ET

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6 Piece Ignition Coil Set TRQ-1AERK00112 does not fit your:

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select your Vehicle, to verify this Part will fit.

This part will only fit a 2005 Chevrolet Trailblazer with these options.