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Help with DTC's & SDD


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Reaching out for some help as I've hit a wall with understanding why the Cat is not working properly.

So I have the following issues:

1. When driving the car ( or sitting still and revving higher than 3000 ) the car goes into limp mode, DTC not available etc....

2. Recently the key fobs stopped opening/locking doors, the fob still works when inserted and car functions normally.

So I have the following codes:

Instrument Cluster Control Module

U0214-00 This refers to the keyfob issue

P0635-11 This refers to a power steering issue.

HVAC Module

B11FF-84 This refers to lack of gas in system.


U0264-00 States ignore this DTC.

U0214-00 No info provided


U0214-00 No info provided

ABS Control Module 

U0401-68 Invalid data received from ECM/PTC module.

RFA module not responding - tried to test through the SDD but failed.


So, I need some help understanding the consequence of the RFA not working and what exactly it is....

Could this be causing the limp mode?

If anyone in the Swansea area ( happy to drive further ) can assist then I am happy to pay ...

Thanks in advance.






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Hi Keith

First thing to check would be the battery. Random codes and problems such as you are suffering are often down to a failing battery. How old is the battery? Have you had it tested / have you tried charging it? Was / Is your stop / start working normally before these symptoms? Has the car been stood for a while / used for short journeys only?



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Thanks John.

The battery is less than 6 months old, and I will remove it and fully charge it and hope it removes some of the codes.

I did try once before with no difference to the car.

What is a short journey? The car travels at least 18 miles each way twice a week, what mileage is minimal for charging the battery?

No stop / start as its a 2009 Model.

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So just to update, having fully charged the battery the issue with restricted performance is still occurring.

Some of the codes have disappeared which may be due to the battery or some of the work I have been applying to the car.

I have cleaned the earth points in the boot, under both front wing liners, and behind front N/S light.

Does anyone know of any more? 

I am working through SDD and its pointing towards ABS issue, am planning to change all 4 sensors this week.

Any other advice or suggestions would be welcome.


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Rfa is remote fob somethingorother…It’ll be the module

You don’t tell us what your car and year is. If you disconnected the battery, it may have messed up its security settings, these will have to be reprogrammed via sdd. This happens between the years approx 2012 till 2015

You don’t tell us the codes that are still showing

I would extremely doubt if the abs code is causing the rp - your brakes will still work and I think it would show a light on the dash

Check very carefully the control boxes in the boot and the drivers footwell for any signs of water ingress, plugs too

A usual suspect for rp at your revs is unmetered air getting drawn into the air intake, but that would throw a fault code

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Hi Vic,

The vehicle is a 2008 XF 2.7D.

The codes are in the first message.

The fob stopped working when the battery was disconnected for a week or so, the fob works perfectly when inserted so will try to wake them up through SDD.

The RFA shows a big red cross on when checking the modules on SDD.

Previously there was a fault code with the MAF's so when cleaning didn't work I replaced the two and a new air filter and no fault codes for the MAF for the past 150 miles.

The limp mode is restricted performance / DSC not available..... and with the fault code generated by the ABS ( See first message ) is the reason I was moving towards the wheel sensors.

Three times today with limp mode, so frustrating.


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After a thought, I’m starting to lean towards the battery for some of your problems too, the same as the others above. I’ve had a battery before that’s failed after a few months.

The rp maybe different and I’m surprised it’s giving no codes - as I say, a warm favourite is a vacuum leak

The keyfob? I would be trying a new battery in it first if none of the buttons are working - starting the car has nothing to do with the battery in the fob

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Hi Vic,

The vacuum suggestion is good, I know the rubber diaphragms can split and there is a repair kit available.

I will test it first, assuming I can find them.

Tried replacing the batteries with no change, my power supply has arrived so hopefully tomorrow I can wire up the car and use SDD to verify the fob.

Onwards and upwards.


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