TPMS System not available.

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Sue26

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Mar 29, 2021
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Swift 696
Hi all

Our tyre pressure warning light came on just before we started a long trip last week. We checked the tyres and they were all on the low side so we pumped them up to the correct pressures but the warning light remained on. We checked the pressures again before starting our journey home (London to manchester) and the tyre pressures were still correct so we got on our way. We are home now and although the tyre pressure are all correct, the warning light is still on. The display also reads "tpms system unavailable" when first switched on.
Is there anything simple I can check before it becomes an expensive trip to a garage?

Thanks in advance.
 
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On the Mercedes there is an option to reset the system once you've inflated the tyres to the correct pressure.

May be worth looking to see if you have a similar option.

Cheers
Red.
 
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Ducato/Boxer/Relay TPMS 'system unavailable' is almost always down to one or more wheel sensors not broadcasting, likely due to a failing battery. Most tyre depots have the equipment to check the sensors wheel by wheel, including checking battery level.
 
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Oh dear. I think a non-operational factory-fitted TPMS is an MOT Failure now as well :(
 
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Sorry for late acknowledgement of responses, young grandchildren came and I got distracted. Oh dear, this doesn't look like a simple fix for a non-techie, non-mechanical minded person like me. Ours is a 2015 2.3 fiat ducato base van if anybody knows of a 'fix' before we need to take it to a garage 😭

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Have you changed a wheel at all? If not and all is the same physically and you are getting the TPMS Unavailable message, this is most certainly down to a failed Valve Sensor as noted previously.

In my recent experience with this message, it came up and then displayed the TPMS warning light because I replaced my wheels and tyres with a set that did not come with TPMS valves. I purchased some ready-to-go valves and had the excellent Hometyre folks turn up and fit them, scan them to check they were working, and then set off on a 10 min drive up the A1 - TPMS Unavailable message, and the yellow warning light have now gone away and fortunately I can get away with lower than 80PSI too :)
 
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Thanks for the info Andy. We've not had a wheel off at all so the initial warning was probably due to a couple being a little under pressure.
I've looked up the company you mentioned and they do not seem to cover our area. MOT not due until next april- I guess as long as we check the pressures regularly then we've got a bit of time to get this sorted. I had hoped that there was some magic menu on the dash monitor that I had missed that would clear it.
 
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Sadly on most of these models, you can't reset the warning to be at "your desired pressure". Some systems are actually set to near 70 or 80PSI by Fiat/Peugeot as they know the van is going to become a Mohotorhome and will show the yellow lamp when lower than that (quite a bit though but annoying all the same).

If you did not have the TPMS Unavailable message, I would suggest getting to near 80PSI and going for a 15 min drive at over 30MPH to see if settled down (I think you will have done this anyway but unsure of your actual pressures), that is how to reset it so long as the pressure is within range of the TPMS computer. However, with the additional initial error message, this does still suggest a faulty valve sensor in one or more wheels.

A good local garage will be able to diagnose for you by scanning the wheel for the sensor and if they need to pop a tyre to fit a new sensor then so be it; if they have stock and if they can accommodate a motorhome. I assume that on a 2015 van, they will be originals so probably ready to be replaced (yes, stupid system I know) and you might consider replacing all of them anyway...
 
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Andacami said:
Sadly on most of these models, you can't reset the warning to be at "your desired pressure". Some systems are actually set to near 70 or 80PSI by Fiat/Peugeot as they know the van is going to become a Mohotorhome and will show the yellow lamp when lower than that (quite a bit though but annoying all the same).

If you did not have the TPMS Unavailable message, I would suggest getting to near 80PSI and going for a 15 min drive at over 30MPH to see if settled down (I think you will have done this anyway but unsure of your actual pressures), that is how to reset it so long as the pressure is within range of the TPMS computer. However, with the additional initial error message, this does still suggest a faulty valve sensor in one or more wheels.

A good local garage will be able to diagnose for you by scanning the wheel for the sensor and if they need to pop a tyre to fit a new sensor then so be it; if they have stock and if they can accommodate a motorhome. I assume that on a 2015 van, they will be originals so probably ready to be replaced (yes, stupid system I know) and you might consider replacing all of them anyway...
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Thanks for the reply Andy. We topped them all up to 72psi front and 79 rear and have driven home from London on motorway so presume if it was going to reset itself it would have by now. Looks like it's going to have to go into the garage to get sorted. I will start by ringing the garage we use to do the MOT first...

Thanks again.

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I have my van booked in at a Fiat garage next week due to tpms issues, like you I got the warning sign and checked tyres. After this another tyre pressure light came on and my odometer started flashing, hopefully we’ve traced it to the tpms module. It’s £100 plus fitting and resetting, fitting should take 10mins as it’s only 2x 10mm nuts and then probably 10mins to plug in and reset.

I’m going to ask the garage to set them lower as I believe the light only comes on for under pressure unless someone knows any different.
 
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I would pump them all up to the 79 psi and go for a drive to see if the warning goes out. If it does ,you can them start to reduce the psi until you determine what the alarm level is. (y)
 
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Oh good luck lorger. I hope you are correct with your estimate for the cost of your repair. I will be contacting our usual garage in the next few days to set the ball rolling for what I hope will not be a very expensive repair bill.
 
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Jimbohorlicks said:
I would pump them all up to the 79 psi and go for a drive to see if the warning goes out. If it does ,you can them start to reduce the psi until you determine what the alarm level is. (y)
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I guess that won't do any harm even if it doesn't do any good. Worth a try- thank you.

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Indeed worth a try but be aware that "TPMS Unavailable" message is a sign of something else, not just low pressure...
 
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'TPMS system unavailable' is completely unrelated to tyre low pressure issues (which unsurprisingly see the TPMS light accompanied by a 'low pressure' message) so you can safely ignore advice to adjust pressures and go driving.
 
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k4f78 said:
'TPMS system unavailable' is completely unrelated to tyre low pressure issues (which unsurprisingly see the TPMS light accompanied by a 'low pressure' message) so you can safely ignore advice to adjust pressures and go driving.
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Thank you for the reassurance. Think we will move forward by keeping a close eye on the tyre pressures and check with our regular garage if they can fix the issue. ( More at our convenience than as a matter of urgency.)

Thank you.
 
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Quick update on our tpms issue. As I mentioned previously, our low tyre pressure light was on and the dash warning "tpms system not available" was given prior to our last journey in the moho. Tyres were checked and pumped up where necessary and we drove back from London. Both warnings remained. We used the van this weekend and on switching on the ignition, we're warned that front left tyre was at 4.4 bar. (So it seems the system is now working ok again.) Pumped up to 5 bar and the low pressure light went off and no system error or low tyre pressure warning given. The "system" seems to have corrected itself- glad we didn't rush to book it in the garage. We just need to keep the tyres at a higher bar pressure than we previously had done.

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I'd have the system removed as it was designed by BMW solely to monitor run flat tyres which are far less prone to pressure fluctuations. Just another unnecessary gizmo for owners with standard tyres to worry about.
 
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Iveco systems are rubbish, I set the pressure with my compressor at home and with the digital gauge I have they are set to the same pressures, go look at the TPMS and they are all over the place some aroun 4-5 psi difference 😳😳
Plus if I want to run lower psi there is no way to change the set low psi warnin!!
 
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Sue26 said:
Quick update on our tpms issue. As I mentioned previously, our low tyre pressure light was on and the dash warning "tpms system not available" was given prior to our last journey in the moho. Tyres were checked and pumped up where necessary and we drove back from London. Both warnings remained. We used the van this weekend and on switching on the ignition, we're warned that front left tyre was at 4.4 bar. (So it seems the system is now working ok again.) Pumped up to 5 bar and the low pressure light went off and no system error or low tyre pressure warning given. The "system" seems to have corrected itself- glad we didn't rush to book it in the garage. We just need to keep the tyres at a higher bar pressure than we previously had done.
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This happened with ours several times before finally stopped resetting, hopefully your's will be ok.
 
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