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sprinkles08, Chrysler/Dodge/Jeep master tech
Category: Dodge
Satisfied Customers: 23000
Experience:  ASE Master and Advanced Certified, Chrysler/Dodge/Jeep Master Certified, Trans and Hybrid Specialist
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I have a 2012 Dodge Challenger R/T Classic. Bolt on mods

Customer Question

I have a 2012 Dodge Challenger R/T Classic. Bolt on mods include: BBK shorty headers, Zoomers catback exhaust, and R2C cold air intake.
During acceleration, when I let off the throttle, the transmission tries to do a quick down shift. Then the engine light comes on, and the transmission is completely not working. I have to pull the car over and place it into park to reset it, then it starts working again. Both times it happened during moderate acceleration and not WOT.
I have done a transmission fluid flush and fill.
Will a proper tune from a Diablo correct this?
Please advise.
Submitted: 2 years ago.
Category: Dodge
Customer: replied 2 years ago.
I should mention automatic transmission as well.
Expert:  sprinkles08 replied 2 years ago.
Hello and welcome to JustAnswer!
You may have a few things going on. The trans may actually be slipping due to a hydraulic issue or clutch failure, you may have a speed sensor issue, there may be a shift cable/range sensor related issue. If the TCM sees the shifter move out of park then the trans usually won't engage again until after a key cycle.
If the engine light is coming on it's because the TCM is seeing an issue and setting a fault code, the first step in diagnosing the problem is seeing what codes are setting. Do you know what codes are setting in the TCM?
Customer: replied 2 years ago.
My apologies for the late reply.The codes being thrown are as follows:P0507 - Idle air control system - RPM higher than expectedP2096 - Post catalst fuel trim system too lean bank 1.
Expert:  sprinkles08 replied 2 years ago.

Was the TCM checked for codes as well?

Customer: replied 2 years ago.
Those are the codes displayed once hooked up to the OBD II port.
Expert:  sprinkles08 replied 2 years ago.

Did you specifically pick the TCM from a module menu?

Customer: replied 2 years ago.
No. My tool only allows me to view codes and clear them.
Expert:  sprinkles08 replied 2 years ago.

The transmission is disengaging, correct?

Customer: replied 2 years ago.
That is correct.
Expert:  sprinkles08 replied 2 years ago.

If the engine light is coming on when this happens then there has to be codes setting in the TCM, you're going to need to know what they are. The P0507 may cause electronic throttle control limp in but if the trans is disengaging and the engine light comes on then you're going to need something that will read TCM codes.