I've only had this jeep for a few months and this is first sign of any problems.

It idles fine and seems run ok up to 2000 rpms ... but won't go above 2k at all.
Even in Drive or Park, acceleration just fades away above 2k.

It all started 3 nights ago ... came around a corner, hit large pool of standing water at about 65 mph.
Thought I was a gonner for a sec ... All the lights (dash inc.) went out for a second.
And then they came back on, jeep had stalled and wouldn't start.

I coasted over to side of road and waited 15 minutes ...
and was able to get it to start and seemed to rev up ok.

But once I would try to drive, the issue started ... wont rev over 2k
and acceleration fades to nothing if try to push it past 2k rpms.

Eventually, was able to get it home and checked the next day ... and it had thrown (3) codes;
P0171, P0174 and P0884

The jeep is dry ... the air filter / box is dry ... no sign of any water damage.
But its acting like there is a leak in the air intake or possible low fuel pressure?

I checked the fuses ... cleaned/inspected the Air Intake ... replaced the MAP sensor ... replaced Air Filter
And used a ODB II scan tool to clear the codes ... but no change in the issue.
(also removed battery for couple hrs)

If its stuck in "limp mode", I've no idea how to get it reset ... scan tool didn't seem to do it.


Any ideas how to troubleshoot this further?
Trying to avoid the stealership, if possible ...


p.s. my Jeep details;
2011 Unlimited Rubicon 3.8L Automatic (stock) ~55k miles

 

https://www.autocodes.com/p0174_jeep.html

might help.

 

thanks, I came across the same video but wasn't helpful.

Weird thing, it doesn't seem like "limp home mode" is active ... reverse and forward gears work.

I cleared the codes and went for a test drive, still only accelerates to ~2k rpms and then fades.
After pushing it for a few minutes, it kicks out codes P0171 and P0174 ...

almost as if hitting the water dislodged or shorted out something.

 

The P0884 code is: TCM Power Input Signal Intermittent. This unit controls a lot of vehicle and engine functions. You need to locate the TCM which either has wet terminals inside one of its connectors. I have read about this happening on several vehicles.

 

Here is some information for the P0884 code you had:

P0884-POWER UP AT SPEED



Theory of Operation

If a vehicle loses power to the PCM, the vehicle will go to the 2nd gear mode since there is no power available to control the transmission solenoids. However if power is restored, the PCM will power-up and normal operation will be restored. This DTC identifies that power to the PCM was restored when the gear selector was in a "Drive" position while the vehicle was moving at speeds above 32 km/h (20 mph). If a customer shifts to Neutral and cycles the ignition key and quickly shifts to "Drive" while moving before the PCM comes out of its START ROUTINE, the DTC can be set. Therefore it is critical that this DTC diagnosis repair procedure should only be used if the vehicle is experiencing intermittent 2nd gear operation and subsequently a return to normal operation during normal driving. The transmission will not be placed in limp-in. This is an informational DTC to be used when attempting to diagnose an intermittent 2nd gear operation and subsequent return to normal transmission operation.

• When Monitored: One time after each controller reset. Note: the Transmission Control Module is integrated with Powertrain Control Module. The Transmission Control Module has separate powers and grounds specifically to its portion of the PCM.
• Set Condition: This DTC will set if the PCM powers up and senses the vehicle in a valid forward gear (no PRNDL DTCs) with an output speed above 800 rpm, approximately 32 km/h or 20 mph.

[TABLE]
[TR]
[TD="bgcolor: white"]Possible Causes
[/TD]
[/TR]
[TR]
[TD="bgcolor: white"]INTERMITTENT POWER AND GROUND CIRCUITS
[/TD]
[/TR]
[/TABLE]

 

Problem solved! ... Brought it into the Dealership, after unable to find the cause.

At their insistence - we first tried replacing the battery.
But as I expected, it didn't change anything.

It was still idling fine but couldn't accelerate -
But ~3 hours later, they called me with the culprit.

"Somehow" a fuel line near gas tank was "pinched" -
and preventing fuel from getting to the engine.

Since it was working fine up till I hit that puddle -
can only assume the water pressure bent it.

And since its metal, it couldn't straighten out after.

 

Now whats the chances of that happening??? Water bending the fuel line. There must have been something in the water that got kicked up when you went through it.