Axle Swap - Limp Mode

[JL JL Guy]

New to the forum but I have read very useful information here previously.

I have a 2020 JLU Sport with the 2.0 engine. I recently had my Sport axles taken off and swapped with Rubicon 392 XR take off axles. I had the lockers on the new axles wired to my VO Switch system. I also had the Teraflex Delta brake kit put on at the same time. I have taken it off road twice since the axle swap and they performed great off road. However, both times my Jeep went into limp mode when I returned to the highway. After returning home and shutting the Jeep off a couple hours, road driving returned to normal.

It was a relatively cool day and the trail was mild with the exception of a couple short hill climbs that required the lockers. I’ve never had my Jeep go into limp mode after going off road or at any other time. I can’t help but think that this is somehow related to the new modifications but I don’t know. Any help on potential causes would be appreciated!

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[azwjowner]

Did you update the axle gear ratio in the Jeep's computer?

 

[jwilson2899]

^^^this. If you don’t correct the axle ratio in the PCM, It will cause limp mode.

 

[Jeeps2Little]

Did you update the gear ratio via tazer or Jscan?

(ha, 3 great minds)

 

[JL JL Guy]

I had a shop do the work so I will need to verify with them. I know they used a tazer to update programming but I don’t know the details of what they did. Thanks for the reply!

 

[Terry R]

Out of curiosity, since I have been contemplating an axle swap. What was the cost? Axles and labor?

 

[JL JL Guy]

The axles were $4k and the shop charged 16 hours of labor for the swap.

 

[Terry R]

Thanks for the info.

 

[Surfwagon]

The axles were $4k and the shop charged 16 hours of labor for the swap.

For anyone in the know, does 16 hours seem excessive?

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