Should I replace all coils?

[tdebacker]

I recently had #8 coil go bad on a road trip to South Dakota. (Vehicle is 2017 Suburban Premier 5.3 for reference) I usually do my own work, but this thing started misfiring and popping up like 15-20 codes so I dropped it off at the dealer. I was fully prepared for it to be a computer or something expensive.

I get a call later saying #8 coil was bad so I had it replaced.

I changed my spark plugs/wires around 97k and I'm currently at 140k.

With GM engines, if one coil goes bad, should I replace them all or can I just replace the one that went bad?

 

[Doubeleive]

I recently had #8 coil go bad on a road trip to South Dakota. (Vehicle is 2017 Suburban Premier 5.3 for reference) I usually do my own work, but this thing started misfiring and popping up like 15-20 codes so I dropped it off at the dealer. I was fully prepared for it to be a computer or something expensive.

I get a call later saying #8 coil was bad so I had it replaced.

I changed my spark plugs/wires around 97k and I'm currently at 140k.

With GM engines, if one coil goes bad, should I replace them all or can I just replace the one that went bad?

normally coils last a really long time you should be fine with just changing the one out.
otherwise you would read about issues with them often and this is simply not the case.

 

[PPV_2018]

Rule #1 with ignition coils: if it ain’t broke don’t fix it. These are not maintenance items

If one fails/malfunctions, replace that one. Otherwise don’t mess with it.