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Powertrain Malfunction Warning After Deep Snow Adventure

Raacerx

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We took my 2021 Ranger Tremor out in some Spring snow this past weekend. Most of the time was spent in 4LO with the rear diff locked, and we had 4 folks and about 700 pounds of gear, with mud, slush, snow, and ice.

At one point we got proper stuck in a 4+ foot snow drift across the trail and it took about an hour to dig her out. At this point we turned around and started to head back, which is when the Powertrain Malfunction Warning Light came on and the vehicle began to behave strangely, including struggling to make it back through some drifts we had breezed through before, traction control acting weird once in 4HI, etc.

Upon finally reaching the highway, we partially aired back up to 30psi and immediately had major drivability issues on the pavement.

The truck would not accelerate and was in full limp mode, bleeding all the boost, gear changes were harsh bangs, and lifting off the gas would cause the whole drivetrain to catch and bang.

It felt like when 4LO is engaged and you shift out of reverse when its loaded.

After a few stops and unsuccessful restarts, airing up to 38PSI with no change, we finally spent 20 minutes removing all the ice and snow from the undercarriage, axles, and other areas, and let it run for 15 minutes and then cool down for 10 minutes.

Everything was back to normal after this.

Obviously something happened with the ice and/or ultra cold temps. Maybe blocking an ABS speed sensor, or perhaps not allowing something in the transfer case to fully disengage, or freezing a sensor out of commission!?? Unfortunately I left my Ford laptop and cable back at home like an idiot, so I cannot scan it now, but figure this will be stored?

Was planning to head out again, but don't like the idea of having to get under the truck in the snow every couple hours.

Any ideas?

DSC02937C.jpg


PS. Absolutely love the off-road performance of the stock Ranger Tremor in almost everything... except deep snow. I know the tires are just all-terrains and we had significant weight, but I've literally done this same trail in my Audi SQ5 with less trouble (granted, that was with 315 wide snow tires). I expected a bit more.
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puckdodger

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I had something similar in the cold and crappy weather, snow not that deep and wasn't using 4LO. Stopped like you and it cleared itself and no other issues with it since then. You get any codes?
 
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Raacerx

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I have not scanned for codes yet as I left the scanner at home.

It may be of note that I have the Ford Performance tune and a downpipe. I never noticed coolant temps getting high, but there was lots of tire spinning at various stages, lol.

I had no other lights on the dash except the powertrain warning. We drove for maybe 5 miles on the trail at speeds under 20mph, and then about 1 mile on the highway below 50mph.

I have to admit that things feel a little looser and sloppier now.
 

Adventure Ranger

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How cold was it? I have had 2 intake manifolds crack due to ice buildup inside, there is a service bulletin for an update manifold and PCV plumbing. When the problem first started, it would go into limp mode with all the warnings as you stated, no power, harsh shifts, etc... Found if I let is sit and idle for a bit, it would create enough engine heat to melt out the ice build up in the Intake and Throttle Body. That was the cause. If you were pushing lots of snow and it was getting some sucked into the intake - that could be the issue ?
 

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How cold was it? I have had 2 intake manifolds crack due to ice buildup inside, there is a service bulletin for an update manifold and PCV plumbing. When the problem first started, it would go into limp mode with all the warnings as you stated, no power, harsh shifts, etc... Found if I let is sit and idle for a bit, it would create enough engine heat to melt out the ice build up in the Intake and Throttle Body. That was the cause. If you were pushing lots of snow and it was getting some sucked into the intake - that could be the issue ?
:inspect: ?
 


Progeny2021

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We took my 2021 Ranger Tremor out in some Spring snow this past weekend. Most of the time was spent in 4LO with the rear diff locked, and we had 4 folks and about 700 pounds of gear, with mud, slush, snow, and ice.



DSC02937C.jpg
Ranger wasn't happy.... :(
 
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Raacerx

Raacerx

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How cold was it? I have had 2 intake manifolds crack due to ice buildup inside, there is a service bulletin for an update manifold and PCV plumbing. When the problem first started, it would go into limp mode with all the warnings as you stated, no power, harsh shifts, etc... Found if I let is sit and idle for a bit, it would create enough engine heat to melt out the ice build up in the Intake and Throttle Body. That was the cause. If you were pushing lots of snow and it was getting some sucked into the intake - that could be the issue ?
Actually it was quite warm out in the sun, a nice 60*F as illustrated by my compadres t-shirts, haha. But most of the journey was indeed through or over snow and slush. The underside was frozen in a variety of places, despite the engine running for hours, mainly because we rarely exceeded 15mph.
Truck has 8500 miles on it.

I checked the filter and it was bone dry. I ended up swapping out my K&M oil for a factory because it got dirty too fast.

Ranger wasn't happy.... :(
Ranger was definitely not happy.

The frustrating thing that has me questioning a continued relationship, is that this is not the first time I've had issues on rougher and longer off-road stints, and it has me worried about some future 3+ week adventures planned.

During a road trip with nearly 1000 miles on trails for weeks, also fully loaded up for overland hunting and fishing, I lost A/C, a ton of power, and went down to under 10MPG on the freeway after 3 days in Siskiyou.

I never got a code and never found any stored DTCs or anything, and coolant and oil temps were fine. Gas mileage never fully recovered, but power sure seems to be more than fine, and I never threw my auto cruise back in so that probably makes a huge difference.
 

Progeny2021

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Actually it was quite warm out in the sun, a nice 60*F as illustrated by my compadres t-shirts, haha. But most of the journey was indeed through or over snow and slush. The underside was frozen in a variety of places, despite the engine running for hours, mainly because we rarely exceeded 15mph.
Truck has 8500 miles on it.

I checked the filter and it was bone dry. I ended up swapping out my K&M oil for a factory because it got dirty too fast.



Ranger was definitely not happy.

The frustrating thing that has me questioning a continued relationship, is that this is not the first time I've had issues on rougher and longer off-road stints, and it has me worried about some future 3+ week adventures planned.

During a road trip with nearly 1000 miles on trails for weeks, also fully loaded up for overland hunting and fishing, I lost A/C, a ton of power, and went down to under 10MPG on the freeway after 3 days in Siskiyou.

I never got a code and never found any stored DTCs or anything, and coolant and oil temps were fine. Gas mileage never fully recovered, but power sure seems to be more than fine, and I never threw my auto cruise back in so that probably makes a huge difference.
That's not good. Did you escalate the issues with Ford?
 
 








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