rdamon Posted February 6, 2017 Share Posted February 6, 2017 2009 Legacy 2.5i, 4eat, SE. I've read several of the threads regarding this speed sensor code, but none seem to have the same symptoms I'm experiencing. Out of the blue, the CEL came on accompanied by the VDC and blinking cruise lights. There wasn't any service or repairs before the CEL came on, either. Everything else works; ABS is fine; no limp home mode; speedo works; mileage is still good. I plugged in my scan tool and was surprised to see only a P0500 code. Found one thread that suggested that the screws holding the speedo to the circuit board were loose. Mine isn't fastened that way. Anyway, I cleared the code, but after a few miles it came back on. Cleared it again, but haven't driven too far since. It's off now, but I'm curious if anyone else has had this happen and, if so, what causes it? I'm pretty new on the this forum, but have already found a lot of helpful threads. Thanks. Link to comment Share on other sites More sharing options...
ehsnils Posted February 6, 2017 Share Posted February 6, 2017 It can be an indication that the sensor itself is becoming unreliable. But another factor that can cause strange unexplained codes is if the battery or alternator is getting bad - undervoltage or overvoltage. Link to comment Share on other sites More sharing options...
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