warning lights, CEL, VCS off, TPMS, Trac code P0356
12-01-23, 08:55 AM
#1
2nd gear
Thread Starter
warning lights, CEL, VCS off, TPMS, Trac code P0356
2009 RX350, I've been through the forum and thought I'd document my journey with the warning lights that showed up. Advice is welcome...
My TPMS light indicator was on yesterday morning. It's been below 20 degrees F so, Check air pressure and added 2 lbs each tire. Light went off. I then drove the car about 20 miles and the TPMS light came back on. I pulled over checked all tires, no air pressure loss. Restarted the car, the warning light was off. I continued my trip, another 20 miles and the check engine, VCS off and the Trac control lights all came on. I pulled over, checked my manual. checked fluids and continued to drive. I did start to notice a hesitation or just soemthing off at 50mph, 65 mph that was random. At my destination, I stopped at Auto Zone, had the code read. Came back with a P0356. Started the car and the code was gone- without any actual clearing of the code. Drove about 2 miles and the CEL, VSC off and Trac lights came back on. I did normal tests as recommended to reset the trac or VCS off. no result. I drove about 20 miles and the TPMS flashed and stayed lit. Currently all 4 warning lights are on. I am assuming this is a PCM issue. I am going to rescan right now to see if the code is the same. I'll update post as I resolve or find more issues. (as a note, my AFS has also been off or on and cannot be reset and, my auto wipers have been turning on when it doesn't seem to have a legit trigger like rain or any wet on my windshield- not sure it's related. but hey, I'm gonna document what I've got.)
My TPMS light indicator was on yesterday morning. It's been below 20 degrees F so, Check air pressure and added 2 lbs each tire. Light went off. I then drove the car about 20 miles and the TPMS light came back on. I pulled over checked all tires, no air pressure loss. Restarted the car, the warning light was off. I continued my trip, another 20 miles and the check engine, VCS off and the Trac control lights all came on. I pulled over, checked my manual. checked fluids and continued to drive. I did start to notice a hesitation or just soemthing off at 50mph, 65 mph that was random. At my destination, I stopped at Auto Zone, had the code read. Came back with a P0356. Started the car and the code was gone- without any actual clearing of the code. Drove about 2 miles and the CEL, VSC off and Trac lights came back on. I did normal tests as recommended to reset the trac or VCS off. no result. I drove about 20 miles and the TPMS flashed and stayed lit. Currently all 4 warning lights are on. I am assuming this is a PCM issue. I am going to rescan right now to see if the code is the same. I'll update post as I resolve or find more issues. (as a note, my AFS has also been off or on and cannot be reset and, my auto wipers have been turning on when it doesn't seem to have a legit trigger like rain or any wet on my windshield- not sure it's related. but hey, I'm gonna document what I've got.)
12-01-23, 11:34 AM
#3
You may want to check your battery's condition, low voltage can easily account for ghost lights popping on, being your weather has been so cold that could be something to look into and free. Bad battery, bad grounds, bad alternator will often give all kinds of warnings that dealerships LOVE to charge hugely for
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