Help with hard reset

[Johneh]

Well, I tried jumping my 2014 cx5, 80k miles, always has ran great, and the jump start it didn’t even seem to make a difference. No electricity of any kind. So, I started checking fuses testing relay boxes. Couldn’t find anything that was faulty. Decided to try jumping it again, and after leaving it on the jumper cables for longer, 15 minutes, it started fine.

Except…..now all kinds of warning and engine lights are on and it runs like s***. Doesn’t shift smooth at all. After driving it a hundred yards, I pulled into a parking lot and turned it off. I then tried disconnecting the battery cables and let it sit for 15 minutes. Reconnected them and started it up fine, but same thing; all kinds of engine warning lights on and drives super clunky.

Then, I got a new battery. Still all the warning lights (warning, check engine, scbs, abs….)and clunky driving. I feel like because I was checking fuses and relay boxes I messed something up. It’s always ran perfectly before that.

People are saying alternator, but there were no signs of weak alternator before this and it ran perfectly.

Have been trying to do some kind of factory reset, by unhooking battery terminals and reconnecting them, but nothing changed.

At this point I’m planning on getting it towed to a Mazda service mechanic.

Any help is appreciated!
Thanks.

 

[N7turbo]

Is it possible that the jumper cables were installed backwards, ie negative to positive and positive to negative? I think I saw a post here once where someone did that and it fried some electronics.

 

[HyFlyer]

Do you have a battery charger? Give the new battery a solid full charge at home?

Next question is why did you need a jump in the first place? Battery old? Some accessory or light left on?

Any corrosion on the terminals? Nice and tight?

 

[Johneh]

Do you have a battery charger? Give the new battery a solid full charge at home?

Next question is why did you need a jump in the first place? Battery old? Some accessory or light left on?

Any corrosion on the terminals? Nice and tight?

I had to jump it because I left a dome light on. Now I have a new battery. No corrosion on terminals.

 

[HyFlyer]

So, it's good that there is a known reason why the battery was flat. A completely dead battery or pulling battery cables off will reset some modules. That could be why some hard shifts while modules relearn.

Do you have a battery charger? If not you could start the car and just let it idle for awhile 30 minutes or so.

If you're sure there wasn't any crossed cables during the first jump start attempt, next I would want to scan for DTC's and see what's coming up and clear them and see what comes back.

 

[N7turbo]

Three relevant links. Not saying you did this, but it sounds very familiar:

C

2013~2016 Thread 'Dealer can't find problem in CX5 that blows fuses'

Nov 6, 2019

I'll make this as short as possible, but I think the chain of events is important to figure out what to do:

1. Daughter leaves interior light on on 2015 CX5. Battery dies.
2. Tow truck driver apparently connects jumper cables wrong; then corrects himself and car starts.
3. All lights on dash illuminated. Power steering doesn't work. Car can be started, however.
4. Tows car to Trusted Mechanic who doesn't do electrical, so then car is towed to dealer.
5. Dealer replaces fuse**, charges her $180, and sends her on her way.
** There is some question as to whether this is a 7.5A fuse in fuse...

• chuckhawley
• abs fuse srs
• Replies: 21
• Forum: CX-5 Powertrain

A

Thread 'Connected battery cables to the wrong posts'

Sep 13, 2024

I changed my battery out and wasn’t paying attention and connected the wrong terminals to the wrong posts. The horn was blowing. I disconnected them pretty fast. I read up and everything said a fusible link. Well I changed that which was blown and it still won’t start. What else can I do?

• awjones75
• Replies: 22
• Forum: CX-9 General

Post in thread 'Not starting even with new battery and starter, seems to have lost TCM communication'

Apr 15, 2019

I agreed it sounds like polarity EXCEPT, if I'm not mistaken, the car wouldn't have been able to jump the other car. So he would surely know he did that

If he/she made the mistake of hooking the cables up backwards on the first attempt to jump the other vehicle it could be the case or also if after attaching the clamps to the cx-5 battery, he/she then accidentally touched the other end of the jumper cable clamps together. Either of those would most likely fry the ECU or other electronics of the vehicle.

It just seems like too much of a coincidence to have the issue right after the...

• rsvinylgraphics

• 

 

[shooter357]

I don't know how long you've driven after battery change but you may see the warning lights reset themselves over time.

 

[Johneh]

I don't know how long you've driven after battery change but you may see the warning lights reset themselves over time.

I drove like 100 yards. Then I tried driving again in the parking lot and it was so clunky, I stopped.

 

[N7turbo]

Please get the car scanned and let us know what codes show up.

Since you can't get it to a parts store, you may need to use one of the bluetooth modules.

 

[Johneh]

Please get the car scanned and let us know what codes show up.

Since you can't get it to a parts store, you may need to use one of the bluetooth modules.

Getting in towed to a Mazda service shop tomorrow. Will let you know how it goes.