2009 Hyundai Genesis: Tire Pressure Warning Again
December 09, 2009
A day without a tire-pressure warning is like a day without sunshine. At least for me lately.
Actually, with this week's weather in Southern California I've seen more tire pressure warnings than sunshine. The most recent came courtesy of our long-term 2009 Hyundai Genesis yesterday morning. I was up early and probably a good mile from the house before I looked down and noticed the "Low Tire Pressure!" message in the Hyundai's information screen.
After a few colorful phrases I looked closely and saw that both rear tires were flashing in the icon.
Even with my recent tire luck it was hard to believe both rear tires were dameaged and losing air. More likely the cold (for Southern California) temps had bunched all the atoms in the tire's air together, reducing psi and setting off the Hyundai's Tire Pressure Warning System.
I pulled into a gas station and confirmed both rear tires at 28 psi. This was after driving for a couple miles, so they were already hot and no doubt holding more pressure than when I first started the Genesis at my house. I'd guess the cold pressure was probably closer to 24-25 psi. The sticker in the door jam calls for 33 psi. I pumped both rear tires up to an indicated 36 psi to account for the heat-induced pressure in the reading (we all know you should check psi levels when tires are cold, right?).
The warning light went out almost immediately and hasn't returned after 24 hours, but it raises a good point. Most TPMS won't trigger unless a car's tire(s) is at least 5 or more psi low. It took some rare mid-30s temperatures to reach this trigger level, but the Genesis' tires were clearly low before the cold snap hit; likely around 26-28 psi when the ambient temperature was a more L.A.-typical 55-70 degrees. Still far below the recommended level, but not enough to set off lights and bells inside the car.
Check your tire pressures regularly people. Thank you.
Karl Brauer, Edmunds.com Editor in Chief @ 21,445 miles