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Discussion Starter #1
I did a search and read all of the threads on the "Engine Performance Reduced" message, and was wondering if there have been any updates? I just got my 2006 Range Rover Sport HSE last week. I have 52,000 miles, and was driving home from the grocery store and the message came up on the display. I haven't noticed anything weird since I got it. I got home and pulled the key out, and then started it back up, and the message was gone. I then went on a 20 minute highway drive going between 80 and 95 mph and it seemed to be driving fine. I'm going to be driving 565 miles next week from St. Louis to Wisconsin, should I try and take it in to the Dealership before I go, or should I just forget about it?

Thanks,
Kenny
 

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2013-2015 Range Rover Sport
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kennybahr said:
I did a search and read all of the threads on the "Engine Performance Reduced" message, and was wondering if there have been any updates? I just got my 2006 Range Rover Sport HSE last week. I have 52,000 miles, and was driving home from the grocery store and the message came up on the display. I haven't noticed anything weird since I got it. I got home and pulled the key out, and then started it back up, and the message was gone. I then went on a 20 minute highway drive going between 80 and 95 mph and it seemed to be driving fine. I'm going to be driving 565 miles next week from St. Louis to Wisconsin, should I try and take it in to the Dealership before I go, or should I just forget about it?

Thanks,
Kenny

If you've been praying to the Land Rover gods......... something should have been logged in the ECU and the dealer should be able to see that error code. I'd have it checked out if I were you, Mine did that about 8 weeks ago, a complete software update to the engine and tranny ECU cleared it up.
 

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Discussion Starter #4
umbertob said:
Was the car running on reduced power while the Reduced Engine Perfomance message was being displayed?
No, that's what is interesting, I didn't notice anything out of the ordinary.
 

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2006-2009 Range Rover Sport
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It could be a dirty MAF sensor, search the forum for +reduced +engine +performance +MAF and you should find quite a few threads about it. It happened once on my 06 HSE as I was driving up a mountain road at fairly high speed, I lost almost all power and got the dreaded message on the dash. I pulled over, waited a few minutes and restarted. The car ran fine the rest of the trip and I never saw that message again, and this happened 2+ years ago. At the time I assumed the sudden change in altitude and/or air pressure may have tricked the MAF sensor into sending the wrong info to the ECM, in turn feeding the wrong fuel mixture into the engine and causing it to stall. :?: Excessive dust or a faulty sensor could cause similar issues and fault messages, even though the performance of the engine may not be affected so dramatically (at least not right away.) When's the last time you replaced the air filter? Like suggested above, if you had the time you should probably take the car to the dealer to see if a DTC has been logged into the engine control module, identifying the cause of the fault.
 

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Discussion Starter #6
Thanks guys for the quick replies. I'm taking it to the dealership @ 12:30 today. I'll update the thread with the findings

Kenny
 

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It happen to me many times I took it to the dealer thier found that supercharge cooling pump was the cause, pls do not ask me what is the supercharge cooling pump because i have no idea
 

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kennybahr said:
Thanks guys for the quick replies. I'm taking it to the dealership @ 12:30 today. I'll update the thread with the findings

Kenny
Is your car still at the dealer?

For all of you that have a RRS over 50,000 miles, do you have extended warranties?
 

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Earlier this week I got the dreaded "engine performance reduced" message heading to Tampa on I-4, I went from 85 to 55mph and it wouldnt go any faster
PT Crusier's Ford Escort's were passing me :crybaby2: Took it in to the dealer and it was the Supercharged Cooling Pump, they replaced it under warranty :D and now its better then ever at 38,000K and I am back in the passing lane lol
 

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I know this thread is almost a few years old but it seems my truck is doing the same exact thing as yours but I also had the check engine light come on even though it reset itself. But my question is if your check engine light came on as well & if so what code did it give?
 

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Were you under load? (Up hill?) My SC had the "Reduced Engine Performance" warning when going up steep grades. And yes, the check engine light would illuminate upon the second warning. The SC aux water pump needs to be replaced.


ICYUNVAngela said:
I know this thread is almost a few years old but it seems my truck is doing the same exact thing as yours but I also had the check engine light come on even though it reset itself. But my question is if your check engine light came on as well & if so what code did it give?
 

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So this has been happening to me on my 2007 SC, I just had it serviced and they found only a fault with the battery, it is still happening and I am not under load and only happens on the autobahn when I decrease from high speed.

Going to service again next week and I will let you know what they say but I will have them look at the SC pump.
 

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I had this 3 weeks ago, first trip the replaced the battery, went to drive it home, Punched it to get on the highway and * Bing Bing * " engine performance reduced" turned around and it finally logged the Supercharger Aux water/cooling pump in the computer. hour later problem resolved .
 

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I was getting the REP message regularly. Dealer found 2 codes and I had them replace the aux oil pump. Also did a valvoline fuel injector cleaning service. Car runs like new now, and haven't seen the message since.

Zack
 

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I had this problem a few months ago. Interesting idea that changes in air pressure might cause this. I was driving into a low pressure weather system when this occurred.

Nevertheless, I replaced air filters and throttle body was cleaned by the dealer. No repeat error. Anyone have a good trick for getting to the innermost screw that fastens the air filer housing on each side. This is stubbornly obstructed by the rest of the air intake assembly on 2010 cars. Seems worse on driver's side.
 

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I have a problem that's been driving me mad for the past 6 months. I have a 2009 Sport with 38,000 miles on it and when I do 86 mph the engine quits and it goes into limp home mode. Shutting the engine down resets this, but as soon as I do 86 mph it does it again. It's been into the local dfealer for 3 months and they cannot find the problem, they now want to take the engine out and charge me $5000 to try and find the problem - has anyone got any ideas ?
 

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Dont' take it to the dealer....depending on which part of town you are in, there are 2 good independent shops here in Houston. Let me know what part of town you are in and I can point you in the right direction.
 

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I have a RRS Supercharged 2006 that I bought a couple of months ago. On the city there is not problem; I took it to the car to a long trip with hills and every time I do the same trip the warning EPR pops out and I cannot get more than 60 mph. sometimes if I turn the engine off and on again it disappear but not always. I repeat, that only happens if I go more that 120 kph and in hills or long trips.
 

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THere are numerous threads on this topic. It boils down to either the aux cooling pump is wired backwards or is failing. See the existing threads on how to verify proper wiring and how to correct it if backwards.
 

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I had a similar issue with my 2013 RR Sport Supercharged. I would get the reduced engine performance light within 30 seconds of hitting WOT. At 95% throttle all was good. Dealer first changed fuel pressure senor, that did not fix the problem. Happened again, I had the code pulled by AutoZone to be sure it was ok to continue driving the truck. The code was for low fuel pressure. Back to the dealer, I provided them the code readout, tech ran fuel pump performance test and found both fuel pumps to be faulty. I know our model years are different, but if the above aux cooling pump is not your problem you should consider having the fuel pump checked.

Good luck in sorting your problem.
 
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