Just joined. I have 2006 S Type 4.2. 30,000 miles. Went limp a few days ago. I told Jaguar I want limp disabled. They want to go thru their protocols for inspection. Inspection showed no faults, but they recommend throttle body replacement. I declined. Dealer doesn't know how to disable the limp mode and is checking with their TechLine.


Does anyone know how to disable the limp mode?


Ken

 

Yes fix the problem.

Gus
www.jagrepair.com

 

If it's in 'limp mode' there must be a fault. It exists to protect the engine from doing further damage to itself.

I'd find a more competent dealer, better yet an Independent mechanic.

 

You can't disable the limp home mode. Do you understand that is the car trying to protect itself from further and more severe damage?

As was posted above. Fix the problem.
.
.
.

 

If you are in limp home mode then you must have a fault. If a fault is not present are they using Jaguar software to read the codes? The car is reading a fault so I would say they are not. See if you can find a shop that can read the codes for Jaguar. Do not start replacing parts without direction of the codes and a good mechanic.

 

Post seems to say he wanted limp mode disabled.

Well, can't be (short of a specialist who replaces modules etc at say $10,000 cost).

So, looks like entirely the wrong approach (*). Just diagnose & fix it.

(*) but apparently left the dealer with nowhere sane to go

 

Sorry. I didn't give my reasons for wanting to disable. I'm aware of the complexity of the inter-related systems.

What happened was that car went into limp after turning a corner at a stop light. Went limp. I didn't know what was happening ... out of gas? throttle disconnected? ... then I saw 'park brake error' on left dash screen, and then, 'cruise disabled' on the right. I tried the accelerator, I 'banged' on the brakes ... then I figured our I was in limp, on a 55 mph city street, with no where to park. I got into the narrow bike lane, couldn't find the emerg flasher switch, and limped for 1/2 mile to turn out into mini-mall. I parked, shut down, selected park, presumably park brake set, got out, locked doors, checked the oil, unlocked, restarted, got lumpy idle, and hunting for rpm, but error lights were out.

I drove off and car seemed OK.

Ran the codes with local mech. No codes showing.

Afraid to drive freeway in HOV lane in case of limp failure. Contacted JRL and they ran the codes. None showing. They suggested replace throttle body which seems futile because there is no apparent fault with it.

Safest positive fix is to disable limp mode. I'll risk the trans, but not my life and that of others.

Does anyone know how to disable the limp mode ... or how it works. What does it do to limit speed to walking pace???

Ken ... 2006 S type, 4.2 30,000 miles

 

You can't disable it as people keep telling you.

 

Apparently not.

Yes, many of us know how it works. You can't disable it, for good reasons.

Classic signs of a failing battery. Start there.

 

Yep, check your battery. These cars consume massive amounts of power and when the battery begins to fade, all sorts of unpredictable issues pop up. Read the threads regarding failing batteries and you'll have a much better understanding....

 

>Yep, check your battery.

Yup, my immediate thought, these cars are very picky about electrons.

Easy to eliminate that as a problem so that you could move on to more problematic issues, if need be.
================================================== =
You dreamed of a big star -
He played a mean guitar -
He loved to drive his Jaguar...

So welcome to the machine

 

+1 Click the link in my signature for lots of battery info. It's always the first suspect when things go wrong electronically.

 

Was your Cruise on at the time you went into limp home mode? Also was your error parking brake or just brake?

 

I replied to Gus so this may be duplicate. No, cruise was not on. Left window, in tach, showed, Park Brake Fault. Right window showed Cruise Not Available. They could not be found in the computer by technicians, maybe because of my re-boot process. I shut down the car, got out, locked doors ... the re-entered and started up with no msgs showing.

The other day on starting up first thing in the morning, I got msg in right window showing Cruise Not Available and idle was lumpy. I shut down, re-started and got the same thing. I called dealer so they could hear me go thru the start-up and learn what I was seeing. This time, no msgs in windows, but got engine warning light. I took it to the dealer and they diagnosed and changed the thermostat.

So I don't know if the thermostat seal problem was creating the other spurious signals, or if it was merely a coincidence that it showed while trying to troubleshoot the faulty signals.

I'm still in discussion with JLR NA and would like to hear from anyone who has any insights to this situation.

Ken Berg 2006 S-Type, 4.2 V8, 28,400 miles, original Jaguar/Varta battery still doing its job.

 

Did you get the battery checked? Just because it starts the car does not mean the battery is good. You are telling us Cruise not available, Park Brake not available, Idle Lumpy, Hunting for idle and Throttle Body replacement and the icing on the cake you end up with a Thermostat seal replacement, I am having a hard time with what is going on with the car.

It is hard to understand your car going into limp mode and throwing flags up with no codes and what is even harder to understand is that is that they changed your thermostat when you clearly have another issue. I would highly recommend that you have the battery tested and I am talking about a load test that is FREE at any AutoZone, Advance Auto, Sears and many other places.

Quit playing around with it and get to the meat of the problem and take one step at a time.

 

Thanks Gus. Batt showed 12V, alt 14V, under load 9V. Don't know if batt has 'shelf life', it has only 28,400 miles on it in FL and CA, but will likely replace it on spec depending on what JLR has to say in the next few days about spurious warning msgs and engagement of limp home mode. It's all a mystery to me, and to them also.

Check engine warning light led to codes 173CPJ and 767CPJ for thermostat seal replacement. These are the numbers from the work order. I believe they are the codes.

Throttle body has been mentioned but no codes or other reason to change at this time.

Ken Berg 2006 S-type, 4.2 V8, 28,400 miles

 

9 volts under load is the nail in the coffin. It's toast. Batteries deteriorate over time, not mileage. Heat speeds up the clock. Your battery has probably been on borrowed time for a couple of years.

Don't wait for pearls of wisdom from JLR. If they had all the answers, this website probably wouldn't exist. Weird codes from a low battery might be a revelation to many dealers, it's been proven a thousand times over here.

 

Thanks Mikey. Will replace batt. ken s type 4.2

 

Charge new battery for 8+hrs. Leave off charge overnight. Check volts without starting engine - should be 12.6V or thereabouts.

Note: lead acid, vented battery. Oh, and Jon89 posted about a PEP Boys voucher.

 

Get a new battery!