Sudden RPM Surge, no acceleration - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 01-12-2014, 03:10 PM
Thread Starter
CapeCodCanuck's Avatar
Join Date: Jan 2014
Location: Hyannis, Massachusetts
Posts: 3
Sudden RPM Surge, no acceleration

Only just got my Jeep, less than 600 miles on it...

Had engaged the Cruise control, but was not actually set to a speed yet, when I had to stop at a red light.

Lights green, start to accelerate up to speed, and the engine suddenly revs up over 4K rpm, yet there is no acceleration, only doing about 20-30 mphs, like I was in 1st or 2nd gear (Jeep is an Automatic), yet there is no 1st or 2nd.

Had to shift into neutral, engine calmed down, shifted back into drive, and was able to drive normally. Hasn't happened since. Vehicle at 1K miles now, no other issues.

Had Jeep dealer look at it, no codes, and never heard of this issue before.

CapeCodCanuck is offline   Quote
Old 01-12-2014, 03:37 PM   #2
Join Date: Feb 2013
Posts: 1,938
Its probably like everyone else complaining of these junk auto transmissions. Could be a valve body or torque converter issue. Mine acts similar to yours. I doubt your experience has anything to do with the cruise control. Just pay attention to how it drives from now on and take it in if this becomes frequent.

legitposter is offline   Quote
Old 01-12-2014, 03:54 PM   #3

WF Lifetime Member
WF Supporting Member
::WF Moderator::
mommymallcrawler's Avatar
Join Date: Sep 2013
Location: Scottsdale, Arizona
Posts: 8,158
Sounds like your transmission went into "limp home" mode. If the Jeep computerized netherlands detect that there is some problem with the transmission, it is designed to throw it into limp home mode and stick you in second gear. The idea is this will allow you to drive to the dealer/repair without incurring more serious damage. It appears perhaps whatever was wrong with your transmission fixed itself without throwing a code? This is from the Owners Manual.

Transmission Limp Home Mode

Transmission function is monitored electronically for
abnormal conditions. If a condition is detected that could
result in transmission damage, Transmission Limp Home
Mode is activated. In this mode, the transmission remains
in the current gear until the vehicle is brought to a stop.
After the vehicle has stopped, the transmission will
remain in second gear regardless of which forward gear
is selected. PARK, REVERSE, and NEUTRAL will continue
to operate. The Malfunction Indicator Light (MIL).

may be illuminated. Limp Home Mode allows the vehicle
to be driven to an authorized dealer for service without
damaging the transmission.

In the event of a momentary problem, the transmission
can be reset to regain all forward gears by performing the
following steps:
1. Stop the vehicle.
2. Shift the transmission into PARK.
3. Turn the ignition switch to the OFF position.
4. Wait approximately 10 seconds.
5. Restart the engine.
6. Shift into the desired gear range. If the problem is no
longer detected, the transmission will return to normal

NOTE: Even if the transmission can be reset, we recommend
that you visit your authorized dealer at your
earliest possible convenience. Your authorized dealer has
diagnostic equipment to determine if the problem could
recur. If the transmission cannot be reset, authorized
dealer service is required.
2014 JKR Granite Crystal, 5.13 Auto: RK X Factor 2.5 Inch Lift, Artec Front and Rear Truss, Artec Rear LCA Mounts/Skids, Poison Spyder HD Crossmember, Rock Hard Gas/TC/Evap/Oil Skids, Rough Country Diff Sliders, Nitto Trail Grapplers 37x12.5x17, Pro Comp 97 Series Wheels, Synergy Weld On Rear Trackbar Bracket, PSC Hydroassist, T6 Aluminum Tie Rod, G2 Gold Chromoly Axle Shaft/RCV front axle shaft, Dynatrac Ball Joints, 1310 driveshafts, Artec Rear Upper CA Mounts, Warn VR8000.
mommymallcrawler is offline   Quote
Sponsored Links
Old 01-12-2014, 04:51 PM   #4
Toshbins's Avatar
Join Date: Dec 2013
Location: Berkshire UK
Posts: 94
Did you accidentally nudge the gearstick? It's possible that you locked it into first without realising it. Shifting into neutral and back into gear will have reset Drive and all back to normal.
Toshbins is offline   Quote
Old 01-12-2014, 06:03 PM   #5
spinlock's Avatar
Join Date: Sep 2013
Location: 37.9° N, 121.7° W
Posts: 5,701
You can't blame this on the transmission yet. It could have been pilot error with the CC.

BTW, not recommended to use CC before you break it in. You want the revs to vary unless you believe those who say the new engines need no break in period.
spinlock is offline   Quote
Old 01-14-2014, 11:09 AM
Thread Starter
CapeCodCanuck's Avatar
Join Date: Jan 2014
Location: Hyannis, Massachusetts
Posts: 3
Quite possible pilot error, don't recall nudging the shifter into a lower gear, but it is always possible

Hasn't happened again

Thanks for your help!

CapeCodCanuck is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 04:48 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC. is not in any way associated with FCA US LLC.