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Discussion Starter #1
My 2014 MDX has a problem where it starts strong and immediately dies. I've tried jumping it and charging the battery but the problem hasn't changed.

It happened after I was trying to replace the constant running light on the rear trunk lid. I turned off the interior lights to make sure the battery didn't die and I don't think the battery is the problem, because the car has no problem starting, it just dies after 2 seconds.

Does anybody have any idea what this could be? Immobilizer system? If so, is there any way to start it and avoid having it towed?

Thanks for any help
 

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Do an OBD2 scan. Certain conditions will intentionally shut the engine off after about 2 seconds and throw a code. Camshaft phasing problems are the most common cause.
 

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I would retrace the steps that You took to replace the light.Maybe You created a direct short someplace.
 

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Discussion Starter #5
When you turn the key to run without starting, is the green key flashing in the cluster?
Yes, the green key flashes when I start it. Is that not normal?

Also, I know this probably doesn't apply but it is a push button start.
 

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The green key flashing indicates you have an immobilizer issue. Since you were working with the electrical, you probably blew a fuse. I don't have access to wiring diagram right now, but there is 1 fuse in the under hood box, 1 fuse in the under dash box, and 4 in the under hood aux box, related to the immobilizer system.
 

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Discussion Starter #7
The green key flashing indicates you have an immobilizer issue. Since you were working with the electrical, you probably blew a fuse. I don't have access to wiring diagram right now, but there is 1 fuse in the under hood box, 1 fuse in the under dash box, and 4 in the under hood aux box, related to the immobilizer system.
I've only checked a couple fuses, 5 and 10 in the under the hood passenger side fuse box. I'll gladly check more. If anybody can suggest any fuses to check please let me know. I'd love to make this a cheap fix!
 

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the owners manual has a list of all the fuses. On my 2019 there is a fuse box under the hood, two fuse boxes on the drivers side inside, a fusebox in the trunk where the access to the spare tire/inflator kit is. Take a look at the owners manual list for fuses related to engine or imobilizer circuit.
 

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The green key flashing indicates you have an immobilizer issue. Since you were working with the electrical, you probably blew a fuse. I don't have access to wiring diagram right now, but there is 1 fuse in the under hood box, 1 fuse in the under dash box, and 4 in the under hood aux box, related to the immobilizer system.
I would think that if it was an immobilizer issue that the car wouldn’t start at all.
 

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Used to be that way, but a huge customer complaint was extended crank time, so now they let the engine start then verify immobilizer codes. Generally takes about 2 seconds to verify pcm/immobilizer codes.
 

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Used to be that way, but a huge customer complaint was extended crank time, so now they let the engine start then verify immobilizer codes. Generally takes about 2 seconds to verify pcm/immobilizer codes.
on my 2019 no key fob, no start. won't crank, won't go to accessory mode, nothing. Just displays a message that it didn't detect a proper key.
 

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Yes, sorry I should should have specified. Keyless, no fob = no crank, no start
With key, will start and run for about 2 seconds while verifying pcm/immob codes. If not verified engine shuts off.
 

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Yes, sorry I should should have specified. Keyless, no fob = no crank, no start
With key, will start and run for about 2 seconds while verifying pcm/immob codes. If not verified engine shuts off.
So irrelevant to the OP.
 

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Discussion Starter #15 (Edited)
I purchased a scan tool and pulled the codes. The only code I got was U0155. I called the Acura dealership, told them about the code and the problem, and they told me the only thing I could do was have it towed to them. After having it towed to the Acura dealership, I was surprised to find out it was just a battery.

That's it. They put in a new battery and it's fixed. They also managed to get Acura to cover replacing the rear running light fixture under warranty, so I only had to pay for the battery and a diagnostic fee.

I also found this thread that describes the exact same situation but thought it was irrelevant because I had the code U0155.

(̶a̶ ̶n̶o̶t̶e̶ ̶-̶ ̶b̶o̶t̶h̶ ̶t̶h̶e̶ ̶p̶o̶s̶t̶e̶r̶ ̶o̶f̶ ̶t̶h̶e̶ ̶t̶h̶r̶e̶a̶d̶ ̶I̶ ̶l̶i̶n̶k̶e̶d̶ ̶a̶b̶o̶v̶e̶ ̶a̶n̶d̶ ̶I̶ ̶h̶a̶d̶ ̶t̶h̶e̶ ̶s̶a̶m̶e̶ ̶e̶x̶a̶c̶t̶ ̶i̶s̶s̶u̶e̶ ̶a̶f̶t̶e̶r̶ ̶b̶u̶y̶i̶n̶g̶ ̶a̶ ̶C̶o̶s̶t̶c̶o̶ ̶I̶n̶t̶e̶r̶s̶t̶a̶t̶e̶ ̶b̶a̶t̶t̶e̶r̶y̶.̶ ̶I̶ ̶o̶n̶l̶y̶ ̶h̶a̶d̶ ̶m̶i̶n̶e̶ ̶f̶o̶r̶ ̶l̶e̶s̶s̶ ̶t̶h̶a̶n̶ ̶2̶ ̶y̶e̶a̶r̶s̶ ̶b̶e̶f̶o̶r̶e̶ ̶t̶h̶i̶s̶ ̶h̶a̶p̶p̶e̶n̶e̶d̶,̶ ̶a̶n̶d̶ ̶t̶h̶e̶ ̶o̶r̶i̶g̶i̶n̶a̶l̶ ̶A̶c̶u̶r̶a̶ ̶O̶E̶M̶ ̶b̶a̶t̶t̶e̶r̶y̶ ̶l̶a̶s̶t̶e̶d̶ ̶4̶ ̶y̶e̶a̶r̶s̶ ̶a̶n̶d̶ ̶m̶o̶r̶e̶ ̶t̶h̶a̶n̶ ̶8̶0̶,̶0̶0̶0̶ ̶m̶i̶l̶e̶s̶.̶ ̶T̶h̶a̶n̶k̶f̶u̶l̶l̶y̶ ̶C̶o̶s̶t̶c̶o̶ ̶g̶a̶v̶e̶ ̶m̶e̶ ̶a̶ ̶r̶e̶f̶u̶n̶d̶ ̶b̶u̶t̶ ̶i̶t̶ ̶m̶i̶g̶h̶t̶ ̶b̶e̶ ̶w̶o̶r̶t̶h̶ ̶n̶o̶t̶i̶n̶g̶ ̶t̶h̶a̶t̶ ̶t̶h̶e̶s̶e̶ ̶b̶a̶t̶t̶e̶r̶i̶e̶s̶ ̶c̶a̶n̶ ̶b̶e̶ ̶a̶ ̶p̶r̶o̶b̶l̶e̶m̶.̶)̶
 

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oh boy! As it tuned out my issue had absolutely nothing to do with the battery. In fact the Costco battery is going strong.

my issue was the throttle body - these direct injected engines dirty up the throttle body at around 80k miles (maybe less or more)

I took it to an independent mechanic and he had it for days and thought it was several things which it wasn’t. I then took it to Acura and at first they didn’t know and brought in their specialist that is certified to work on the NSX. He knew what the problem was and a day later it was fixed. He had to clean out the throttle body and reprogram the fuel trim levels.

I love the Costco battery. I do have a follow up post which you just reminded me I need to link to so folks know the end solution to my problem.

if it happens again you’ll know it’s not the battery. For me it would happen sporadically and then with time happened more often to almost every other day and my gas mileage was awful. It was about a 16 months in the making to where the last month it would happen all the time to the point where I was going to sell it off wholesale and hated this car. I am back to loving it.

good luck.
 

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Discussion Starter #18
oh boy! As it tuned out my issue had absolutely nothing to do with the battery. In fact the Costco battery is going strong.

my issue was the throttle body - these direct injected engines dirty up the throttle body at around 80k miles (maybe less or more)

I took it to an independent mechanic and he had it for days and thought it was several things which it wasn’t. I then took it to Acura and at first they didn’t know and brought in their specialist that is certified to work on the NSX. He knew what the problem was and a day later it was fixed. He had to clean out the throttle body and reprogram the fuel trim levels.

I love the Costco battery. I do have a follow up post which you just reminded me I need to link to so folks know the end solution to my problem.

if it happens again you’ll know it’s not the battery. For me it would happen sporadically and then with time happened more often to almost every other day and my gas mileage was awful. It was about a 16 months in the making to where the last month it would happen all the time to the point where I was going to sell it off wholesale and hated this car. I am back to loving it.

good luck.
That's interesting. I really hope that my battery was the issue because that would be a cheap fix.

The dealership told me that the battery had completely failed and could no longer hold a charge. That makes sense to me because I couldn't get the car to start after charging it.

Hopefully my problem doesn't reappear, but if it does I'll have some ideas on where to start. Thanks!
 

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Me too! But at least you’ll know your possible path.

my lesson learned -2014+ MDX are mostly beyond independent mechanics abilities beyond remove and replace.

Leave diagnostics to Acura. You’ll save in the long run. But you need to find a good Acura - that’s the key. If your issue comes back make sure you get good will for the next diagnostic or find a new Acura.

wishing you well
 
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