C1D21-05 (6C) fault

[16FujiDisco]

Thoughts and insight appreciated

Picked up some ‘23 Defender wheels and put them on a few days ago; today after about 50 miles I get TPMS warning and tire light. Pulled the code and it said c1d21-05 (6c); went to the display menu and all 4 corners were missing values.

New tpms’s frequency should be the same 433MHz as stock for 2016, so what would cause it not to find them?

Can’t seem to find anything on the code with the (6C) portion; anyone know what that designation is?

 

[Nechaken]

TPMS sensors on these cars are finicky -- I cloned a second set of sensors for winter tires from my factory wheels to a set of HUF Intellisense and it generally recognizes them, but not if I swap one of the wheels to the spare tire location without running them on the car in the previous position first.

I believe 6C is a status code for the error -- like intermittent, permanant, stored, etc.

The delay before error showing up is common -- the service manual sets it out, but there's some routine where once the car has exceeded X mpg for Y minutes, it runs through each wheel position a few times before setting the error condition.

As I understand it, even when the sensors are the same frequency, there can still be differences in the data packet, etc. It may be worth disabling TPMS via the IID tool, doing a drive cycle, then re-enabling TPMS and seeing if that fixes anything...

 

[itsaguything]

Interesting. That’s not my experience. I have multiple sets of wheels and didn’t bother having them “cloned” with the same configuration. I rely on the dynamic nature of the TPMS to detect the sensors and register. I did purchase all the sensors for all the wheels on all the vehicles from JLR.
Though I don’t know about the data packet being sent over the frequency, I suspect your sensors are not currently configured for the TPMS on the LR4 and are sending an unrecognized message. Quite plausible as there’s 10 years difference between the vehicles.

 

[16FujiDisco]

Well, I got a tpms reader / coder and scanned the new wheels but they couldn’t read anything. So it seems that the FB marketplace seller may not have been 100% honest (shocker!), and that the wheels do not in fact have tpms in them as stated.

For new TPMS sensors, what are we using? I’m guessing I should stay away from the same Amazon-ium ones I got for my old Sentra, but there’s a better option than JLR ones.

 

[ftillier]

When I was looking for them, Lucky8 had the best deal on Continental ones (which I believe are what came with my 2012). They were out of stock due to COVID though, and I had to get new tires (old ones were delaminating), so I skipped. Once the sensors died, I just disabled TPMS. Concern with it being disabled is more that the kids won't notice if they get a flat and keep driving until they shred the tire...

 

[BBLR3]

I used a mix of OEM and Continental VDO 315 MHz on mine when I swapped over to Defender rims. Did nothing and no issues with my LR4 picking them up. In fact, now I get an annoying 'spare tire pressure low' message at startup because I'm using a full size spare that I have to air down to make fit into the spare tire location.