This also applies to late GD. GK use a different TPMS system without sensors inside the tires. I had this happen and the somewhat expensive fix. Owners manual says "see your dealer" of course, but I am long out of warranty. Some quick research on this site and others, plus talking to a Firestone store, pointed to a dead sensor, probably due to a dead nine year old battery inside. Estimate was $150 to diagnose, replace sensor and reprogram. Japanese and European cars usually require a reprogramming step, including Honda.

OEM sensors (Honda used TRW) on ebay are under $20, aftermarket about $70 if purchased locally. Local independent tire shop charged $10 to change one.

Now for the expensive part. I chose the Autel TS601 tool for diagnosis and reprogramming. It cost a whopping $300 on ebay. At least this model also includes full OBDII diagnostics as well. I didnt own an OBDII tool already. I expect the other sensors to die withing a few years, amortizing the cost. Our other vehicles are too old to have TPMS, but other friends or relatives may be able to make use of it. Or, resell it on ebay.

Testing the sensors is a snap. The dead one was replaced and the new sensor scanned. Each has a unique hexidecimal ID and work on 315Mhz frequency. With the new sensor ID stored in the tool, connect OBDII cable and the new ID is uploaded into the car's computer. (_!_) is now blinking, but TPMS light is out. Go for a drive and within a block all lights are out and job is complete.

 

I’ve just left the tpms light on for the last 6ish years and check my tires regularly. 🤷🏻*♂️

 

I used a ATEQ Quickset to reset mine. It was only $120.

 

In PA, we have an annual safety inspection: holes in the sheet metal that can allow exhaust gases into the cabin, tires, brakes, exhaust, wipers, lights, test drive can identify broken suspension / bad steering / bad seat belts and Error Codes / Check Engine Light that indicate potential air pollution problem. So, TPMS is part of the FIT's 'safety systems', so an error code / warning light constitutes a 'fail'. You still have to pay the inspector $50+, get it fixed, come back for another $50+, and if you 'pass' then you get the proper color / numeric window sticker that every cop looks at / plainly visible when they drive by. Avoiding the fines ($) for unregistered and/or un-inspected is a good thing.

No benefit in PA for putting off the inevitable: fix the TPMS issue whatever it is. At the most, you have 365 days.