Q: 2011 Camaro SS A6 trans. performed a tune then reset car back to stock. now trans shifts slower 2-3 in D but not in S sport mode

asked by on October 28, 2017

Hi,

I installed a tune the other day on my 2011 Camaro SS Auto. I increased the shift points right at or slightly above redline to 6200RPM. The car ran great when driven aggressively but ran harsh when driven normally so I decided to remove the tune and reset my car back to stock. Now, the car shifts sluggishly from 2nd to 3rd gear during full throttle in just D mode. When I move the shifter to S sport mode, the car shifts 2-3 very quickly like it used to in D. I'm just curious why after going back to stock, the car seems bogged down in D mode but not in S mode. Prior to the tune, both D and S seemed equally aggressive. I've read that people have pulled #5 and #20 fuses to reset the ECUs mapping. Is this something that could potentially reset the engine/trans so it runs the way it used to? Again, this is just in D mode, the car runs perfectly fine in S mode.

Thanks, Andrew

My car has 46500 miles.
My car has an automatic transmission.

The learned, adaptive shift points have possibly been lost or modified. With enough time, they will re-set. However, if you remove power to the PCM and TCM (both are involved in adaptive shifting), new shift points will be learned and those will presumably be "similar" to that which existed prior to the changes that you made. As always, you should check to see if PCM/TCM software enhancements and/or updates are available for your vehicle as such can be very useful and, if implemented, will also help to streamline diagnostics (by ruling out known issues) if a problem arises. If you want this confirmed, and have an on-site diagnostic performed, please request service and the responding certified mechanic will get this taken care of for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Decreased engine power

The decreased engine power may be displayed for a variety of reasons, most likely there is a fuel issue or an engine misfire. In either case, the car's computer has put the vehicle into what we call "limp" mode. When...

How do I customize the Exit Lighting?

The exit lights come on when you exit your vehicle while it is dark out. You can customize how long these lights stay on with just a few steps: 1. Turn on the infotainment system. 2. Press the CONFIG button...

The steering wheel of my Toyota Etios does not return to center

This is an ongoing problem with Toyota and I was unable to find a true fix for this problem. I would recommend having the entire front end checked for any issues and the alignment checked to make sure that the...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Traverse
You You might not always need all of the cargo and passenger space available to you when you buy a 2012 Chevrolet Traverse, but it’s nice to know it’s there. This seven-passenger crossover utility vehicle (CUV) has tons of space...
A Buyer’s Guide to the 2012 Chevrolet Silverado
While While the Ford F-150 is still the best-selling pickup truck in the US, the 2012 Chevrolet Silverado is one of the finest half-ton pickups available today. In fact, the Silverado and the GMC Sierra are actually the same vehicle...
The Best Used Cars to Buy If You Just Retired
Here’s Here’s a cruel, hard fact – car manufacturers no longer target seniors. Instead, they devote their time and energy to appealing to the 18-45 demographic. Still, some features make certain cars more suitable for older drivers. We have...