Hey everyone, this is a continuation of my 4 month saga with Restricted Performance mode, but I thought how we are able to replicate it was interesting enough for it's own thread.

Long story short, by accelerating and turning left my 2016 Jaguar F-Type R goes into "Restricted Performance" mode. Sometimes this causes it to drive somewhat normally and still get up to ~50mph, other times it has been bad enough to not get about 9mph and idle very roughly. We have replaced the:

• Throttle Body
• Accelerator Pedal
• ECM
• BCM
• Battery

but none of those have caused a permanent fix. Replacing these did cause the car to run perfect for 3 days but then went back to the same shenanigans. My independent mechanic is about to throw in the towel and I'm going to have to take it to the dealership unless any of you guys have ideas. Seriously, if any of y'all come up with the fix I'll buy you a steak dinner, I'm getting that desperate ha. Previous thread is here, which has the fault codes and other clues. Thank you all in advance and God help me.

 

This was already mentioned in the other thread, but I'd check electrical connections and grounds.

 

Has the TPS been changed along with the TB?
What codes do you have ?

 

Yeah we changed the TPS along with the TB. Codes are still:

• P06A7: Engine Management System Performance.
• P2127: Throttle/Pedal Position Sensor/Switch 'E' Circuit Low Input.
• P0122: Throttle/Pedal Position Sensor/Switch 'A' Circuit Low Input.
• P0221: Throttle/Pedal Position Sensor/Switch 'B' Circuit Range/Performance.
• P2135: Throttle/Pedal Position Sensor/Switch 'A' / 'B' Voltage Correlation.
• P0237: Turbocharger/Supercharger Boost Sensor 'A' Circuit Low.

Appreciate the reply as I’m really grasping at straws here ha.

 

I'd go with the wiring fault theory - if it works for a few days after modules have been worked on, the wiring is likely to have been disturbed and may take a while to return to its "faulty" position. Good luck finding it, though!

 

Hopefully you weren't planning to join NASCAR.

(I'd agree on a likely electrical fault, and, yes, they can be a bitch to track down.)

 

Seems like a bad connection in the wiring or ground.
Some good info here:
https://autoservicecosts.com/obd2-codes/p06a7/
Sorry about the ads.

Does your vehicle have a supercharger or turbocharger?

 

My car has the V8 with the supercharger. Also, thanks everyone for the replies. I do agree with you all that it is likely to be an electrical fault somewhere. Trying to figure out if the rough idle can narrow down which wire it may be…

 

Excuse my thread resurreciton. First, did you ever find the cause? My 2017 F Type R now has the same issue. I'm getting the "Restriced Performance" message fairly regularly now, and I get the P2127 code only. I've replaced the accelerator pedal, throttle body, battery, and am in the process of reflashing and/or replacing the ECU. Any updates would be appreciated. Thanks.

 

I had a problem with my 2016 6 cyl. where it went into limp mode and dash lights came on that I never knew existed. It sat at the dealer for 6 weeks while they tried to figure it out. They were on the phone daily with Jaguar (the local dealer mechanics were stumped). They narrowed it down to the wiring that runs from the front to the rear of the car. They thought, because they really did not find anything definitive, it had to do with the wiring harness that is towards the middle of the car. Somehow, with all the tinkering it got fixed. I sold the car about a year later but the problem never did return.