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Discussion Starter · #1 · (Edited)
My son's 2015 Altima 2.5 L S began behaving strangely coming back form a 1600 mile trip. He was in the mountains outside Nashville and had just fueled up with gas 15 minutes earlier. The car began revving randomly while climbing the mountain, and did that for the remainder of the two hours home. It continues to do so, not consistently, but most of the time. The revvign makes it seem like the gas pedal is being inconsistently pressed.

Yesterday, the gas pedal became completely unresponsive while driving. At a stop light, in drive, when he would press the gas, nothing would happen. Not even an engine reving/RPM change. He was able to get the car into a parking lot as it would still creep forward at idle. Then after sitting a couple hours, the car was able to be driven home normally. It has only done this (completely unresponsive gas pedal) this one time.

Additional information:
-Idle in park or at stop signs is perfect - zero revving
-about 50% of the time, it shudders when taking off from a stop or accelerating from slower speeds.
-above 30 mph, it will typically rev to higher RPMs, then immediately drop down. It's like it's your pumping the gas pedal.
-Check engine codes just came on P0841, with secondary DTCs of P0746, P0776, P17F0

Please advise on how to troubleshoot and/or what the problem may be. Thank you!
 

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How many miles are on the car and has the CVT fluid ever been changed? To enhance longevity, the CVT fluid should always be replaced every 30,000 mi. When the fluid stays in too long, the chemical properties of the fluid get compromised and it can no longer provide that cushion that's so needed between the steel belt and the cones. The fluid has two great enemies, and temperature is only one of them. The other is shearing force generated by normal operation of the belt, which increases on hills or with a load. This gradually breaks down and shortens the long-chain molecules that cushion the belt. You can generally deduce that by looking at the fluid; if it's very dark brown and has a burnt odor, it's shot!

The DTCs P0841, P0746, P0776, P17F0 all point to an internal problem with the CVT. The P17F0 is the CVT "death code" which means severe belt slippage was detected. At this point the CVT will most likely have to be replaced.
 

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The DTCs P0841, P0746, P0776, P17F0 all point to an internal problem with the CVT. The P17F0 is the CVT "death code" which means severe belt slippage was detected. At this point the CVT will most likely have to be replaced.
The P0841 along with the P17F0 means the front pump is affected along with the belt. That tranny is definitely a dead horse.
 
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