P062A - Vehicle Suddenly Stalling

[Parratt]

Just figured id share my current ongoing.

170K km

Drove home from work just fine. Left the house a few hours later and the Jeep stalled in my driveway.

Restarted the vehicle and it happened again about 15 Minutes later as I was returning home

Code P062A Showed up, check the Pin - Pin for a short or something but everything comes out correct.

Diagnostic workflow points towards the Fuel Pump control module being bad. So ill replace that on my own before handing it off to a dealer if that doesn't fix my problems.

Vehicle idles just fine. Just seems to be a issue while driving (batteries going bad?)

Sponsored

 

[BDinTX]

What year is vehicle, how many miles/km on this battery (‘mericans, 170k km = 105kmi)? Have you ever replaced the battery, if so what year/? Did you replace both main and auxiliary battery or eliminate aux?

Describe the stalling. Did it happen while sitting before you started moving or as you were backing up? Do you have to turn the steering wheel as you backing up?

Can you go into ACC mode and see the battery voltage? If it will still start and idle, what is the voltage during idle? Opening the hood and using a multimeter would be better if you can get help. What happens if you turn the steering wheel side to side (not a lot, just enough to hear the steering pump under load) while sitting still. Can you rev the engine while sitting in the driveway without turning steering?

I’m pretty sure the high pressure fuel pump is mechanically driven. The lift pump is electric. I’ve seen diesels able to idle with a completely failed lift pump but not able rev/accelerate. Turning the steering wheel is to induce high drain on the battery (and see if it induces a stall) since the steering pump is electric. Would be good to rule out failing battery(s).

https://obdadvisor.com/codes/code/p062a-code/

 

[Parratt]

Its a 2021, Batteries were replaced in April 2024. So near two year old. I Battery tested them this morning and the Aux battery is reading 215CCA (rated 200) and "healthy" while the main battery is rated at 37% health and 485/800CCA

So ill be replacing both of them today just for peace of mind.

The stalling happened as I was backing up and I did have to turn the steering wheel. the first time it happened there was no real warning. The second time I got a sudden loss in engine power followed by a "service throttle" and then it died fully a few seconds later. Service throttle went away upon restarting and no CEL codes related to it.

Currently under idle its sitting about 13.4-139 Volts. And I can rev it no problem. Haven't tried turning the wheel. I can do that and report back.

 

[BDinTX]

Fingers crossed for you. I hate throwing parts at a problem but I think we can get some really bizarre problems when the battery is failing. Would really recommend deleting the aux and replace the main.

 

[Parratt]

Fingers crossed for you. I hate throwing parts at a problem but I think we can get some really bizarre problems when the battery is failing. Would really recommend deleting the aux and replace the main.

Yeah, I wouldn't be surprised if dying battery also fried that small module. Well see what happens soon! on my way to buy a battery

 

[Gregj]

Your main battery is the cause of the stalling. When you turn the wheel the electric power steering pump is turning on and pulling the voltage in the system down to below the “run” threshold. The power steering pump is a high amperage draw.
Gregj

 

[Deleted User 38384]

Its a 2021, Batteries were replaced in April 2024. So near two year old. I Battery tested them this morning and the Aux battery is reading 215CCA (rated 200) and "healthy" while the main battery is rated at 37% health and 485/800CCA

So ill be replacing both of them today just for peace of mind.

The stalling happened as I was backing up and I did have to turn the steering wheel. the first time it happened there was no real warning. The second time I got a sudden loss in engine power followed by a "service throttle" and then it died fully a few seconds later. Service throttle went away upon restarting and no CEL codes related to it.

Currently under idle its sitting about 13.4-139 Volts. And I can rev it no problem. Haven't tried turning the wheel. I can do that and report back.

If it's worth anything, first time my EcoDiesel batteries died, I started having all sorts of electrical issues. The dash ended up lighting up like a Christmas tree after about a week, and I started getting misfire codes thrown, and service four-wheel drive system, ABS off lights. Thankfully I had a Patriot before that that did something similar, so I was able to immediately recognize what it was and replace the battery in that fixed it.

The second time my battery went, I didn't get no Christmas tree, no ridiculous service anything showing up. The Jeep just stalled while out on a country drive, and I was able to start it up again without issue. I drove it for another week without any issues, perplexed by what the stall was, and then it stalled again in the community I live in as I was making a turn from a stop sign, and almost running over someone's mailbox in the process. In this instance I disconnected the battery, let it sit for about 5 minutes and reconnected it, and it had a rough start but it did start. Drove it home and spent the whole weekend trying to figure out what it was. Ended up calling out sick on Monday and was getting ready to have a tow truck to tow it to the dealership (which if you know anything about me, is the absolute worst case scenario. I never want to take my Jeep to the dealership ever again if I can help it.)

I forget if it was someone on here or my dad, or one of my Jeep buddies whose numbers I have, but someone recommended swapping out the battery. And as it turns out, from a prior experience I just so happened to have a spare battery which I take with me off-roading and have on a trickle charger at all times in the garage. Pop that in there and it started right up and haven't had an issue since. Naturally I still bought another $300 H7 battery, because you can never have enough on hand with these Jeeps.

But, point being, I wouldn't be shocked if your issue is actually the battery.

If you're outside of warranty, I would honestly recommend to delete that auxiliary. The auxiliary battery is on our Jeeps tend to drain them quicker than then just a bigger main battery alone does.

Also depending where you live can affect it greatly as well. I know here in Texas I've never had a battery lasts 3 years.

 

[Parratt]

Alright! Quick test drive after battery swapping.

No stall experienced. Battery is sitting at 14V at idle.

CEL and "Service Start Stop" still presenting, but might need some time to clear.

Gonna do a longer test drive later. Fingers crossed!

 

[Parratt]

Did a longer drive to the parts store, they warranties the old main battery so im not out of pocket much.

Still have P062A and P025A but no stalling or issues ive found yet.

Ill still order and replace the Module that both those codes point to. Its a cheap $150 Canadian (100usd) part. So might aswell try it.

 

[BDinTX]

Do you have a code reader? If not getting the JSCAN app, a security gateway bypass module, and the extender is a great item to have around.

 

[azjl#3]

it may hold codes until cleared via obd.

 

[Parratt]

it may hold codes until cleared via obd.

Clearing them with my scan tools makes them pop right back up. Maybe my tool cant clear the Permanent codes or something

 

[DylanM]

Clearing them with my scan tools makes them pop right back up. Maybe my tool cant clear the Permanent codes or something

Typically permanent/historic codes can't be cleared. Nothing to worry about, they're just a record of an issue existing at some time previously whereas active/stored codes indicate there is a problem at present.

 

[Parratt]

Replaced the Fuel Pump Control module, still have the two fuel pump codes. Vehicle is running and driving just fine. Kinda weird and lost. Might have to submit it to a mechanic

 

[Pat’s Sahara Unlimited]

Alright! Quick test drive after battery swapping.

No stall experienced. Battery is sitting at 14V at idle.

CEL and "Service Start Stop" still presenting, but might need some time to clear.

Gonna do a longer test drive later. Fingers crossed!

I’m so happy to find this thread! The same thingIs currently happening to me right now! Stuck in a McDonald’s where my car stallez twice just trying ot navigate. I also noticed a huge voltage drop when applying the brakes this morning - whenf I’m stopped with foot on the brake, if I push harder, voltage drops from 14,1v to 12.6v - I initial’y thought the vacuum booster was letting go (I find that it got more noisy lately). Now, power steering does the same.

I’ll buy a new main battery…

Sponsored