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Old 01-12-2014, 03:10 PM
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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.

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Old 01-12-2014, 03:37 PM   #2
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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.

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Old 01-12-2014, 03:54 PM   #3
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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
operation.

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.
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Old 01-12-2014, 04:51 PM   #4
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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.
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Old 01-12-2014, 06:03 PM   #5
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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.
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Old 01-14-2014, 11:09 AM
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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!

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