Hey my fellow Jag lovers, I hope you can help me with this one.

I have a 2002 Jag XK8, 58,000 miles. SHe's been running pretty smooth. I did get the typical ASC/ABS warning message months ago, but other than that running smoothly.

A couple of day ago I was doing about 25 mph down a street when it seemed like the engine fluttered and went out of gear into neutral. Gearbox fault light appeared. I turned off the car, waited a moment then restarted. Everything was fine. I drove straight home. The next day I was driving around for about an hour or so, same thing occured only this time when I restarted the car, gearbox fault light when out but the check engine light flashed and remained. I wasnt to far from home. The next day day took the car to a mechanic to have the fluids checked based on reading up on Jaguar forums.

The mechanic told me the following P codes:

P1632 P1122
P1111 C1095
C1155 C1145

The mechanic (one I have never used before) is telling me that the gearbox fault is due to the ABS module being out. He says it is directly responsible for the gearbox fault. He has not checked the fluid levels at this point. He is telling me that I need a new ABS module AND two wheel sensors. SOunds like a lot of money. What should I do now? I thought I had read that the ABS module really has nothing to do with the gearbox fault.

SHould I have him test the speed sensor and add fluid, clear the codes and recheck or is there a better way to troubleshoot?

Thanks in advance....

 

P1111 is not an error code. It shows the OnBoard Tests have been completed. You will always see this one OR P1000 (OnBoard Tests not completed since last memory clear.

For the others, here's the Possible Causes from the Jaguar DTC listing:






Have him confirm P1632 as it's not listed for your MY.

Your mechanic appears to be going directly to worst case scenario before checking and eliminating other possible causes. He may be right, but you're the one paying.

Graham

 

The c1095 indicates open circuit from the ABS module to the ABS pump. This is repairable, and in fact a fairly easy diy, but check on ebay and you will find several offers for $50-75.
The wheel speed sensors hardly ever fail, but they might need cleaning. The connecting cables do fail from flexing, and may need replacing. Your mechanic wants to thouw parts at the car without knowing exactly what is wrong.

The transmission codes could be due to a weak battery or charging problem, or a faulty switch on the transmission. More knowledgable people will probably offer suggestions.

I would think you could find a better mechanic.

 

+1

The ABS connector can be the issue sometimes and is easy to clean with electrical spray. The wheel sensors are notorious for getting dirty and are also very easy to clean.

You didn't say what solved your ABS light previously, but if you have to open up the ABS module that's a little more complicated. It is certainly a DIY-level effort. Or the module can be rebuilt for ~$150.

Try the easy stuff first. Nothing to lose.

 

Thank you for all the input. On ABS warning, it started about 8 months ago. The mechanic at the time told me it would cost about $1300.00 to fix, but I could live without it. So I have lived with the warning light.

So based on the responses I have asked the mechanic to clean the sensors and check the connection to the ABS module, clear the codes and retest.

With respect to the P1632 code, he stated that the code was in the Jaguar manual and not in the normal ODB list of codes. He mentioned that it read something was corrupt...I need to get the correct verbiage.

I will let everyone know tomorrow the results of cleaning the sensors.

Thanks!

 

I use the Jaguar manual for codes. The extracts I posted in #2 are for the 2002MY.

P1632 is not listed for that model year but is listed for 2003MY:




I know US dealers use model year differently from the actual factory date and your 2002 could be a 2003MY specification.

Graham

 

Is your car a 4.0 or 4.2?

 

My XK8 is a 4.0....

 

OKay so here is the latest twist in this code mystery.

So the mechanic was trying to twist my arm and tell me that absolutely the ABS module was causing the previous codes and my tranny would fail if I did not get a new ABS module......HOwever, in his testing the Gearbox fault warning never returned or even the Check Engine light...both never recurred. SO I drive the car over to my normal jaguar guy who is adjacent to a transmission shop. The ASC warning remains no other warning appeared while driving.

They checked the codes and found that P1122 and P1632 were still hanging around. The codes for the RF and LF speed sensors did not return. With that, the transmission guy is saying the ABS module is not the issue (which I knew) BUT he is saying that the throttle body may need to be replaced. He quickly referred me to the jaguar guy.

My jaguar guy is saying they will clear the codes, have me drive around for a couple of days to see if the problem/codes come back. With that said, should I worry about the throttle body? Is there a cheaper way to fix it? ( I hear it is upward of $1600.00 to repair.....ick...)


Thanks....

 

Check ebay for repair, also use the search function here. There has been a lot of posts on the forums dealing with repair. Iseem to recall something in the area of $600.

 

So the latest to the throttle body issue. As soon as I left the transmission shop, the car began throwing the gearbox fault error and going into engine failsafe mode. It happened about 4 times on the 4-5 mile drive home. In desperation I found a mobile mechanic. He wasn't a Jaguar guy per se, but he knew throttle bodies and was licensed and insured. He came over on a Sunday, he rechecked the codes and found the codes P1121 and P1122. He was not using a Jaguar scanner. He disconnected the battery and cleaned out the throttle body and electrical connectors. The throttle body did have a good amount of gunk in it. He also cleaned the MAF. He verified the codes were cleared. I took a test drive, and things looked good for the moment. The real test came when I attempted to go up a steep hill. The gearbox fault returned. I restarted to the car, and drove down the hill, now limiting my drives to flat terrain. The car has not thrown a gearbox fault since.

Since this was the first time I saw the P1121 code, I realize that the cleaning perhaps only bought me a little time. But it has been three days of driving and no warning lights yet!

I am on the search to find a used throttle body. Although I am seeing mixed recommendations on whether to buy a new/used one or rebuild.