Quote:
Originally Posted by kenchan
does the s-mode match the engine rpm to the drive shaft or one of the tire speed (actual MPH)? 
if the speed sensor gave a werd reading from driving over a bump simultaneously when SRM was activated, would it cause the error?
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Yes there are 3 sensors that play a role in the SRM engine speed calculations, the transmission input speed sensor, the gear position sensor, and the wheel speed sensors.
You can definitely confuse the computer by going into a donut frenzy as the front wheel speed sensors are giving substantially different readings to the rear wheel speed sensors. In this case (takes a couple of minutes of donutting) the stability control, and SRM and any other system that depends on the sensors get shut down. The systems are re-enabled on engine restart.
In the OP's case he says it is happening on start up, which seems unlikely that it would be a wheel speed sensor or the transmission input speed sensor as neither of these would be producing any readings. There is a calibration procedure for the SRM netural position described on page EC-23 (the engine control section) that could be tried. But again as this is a startup failure one of the sensors has to be giving totally whacked readings and as all other systems are functional it appears to be directly related to SRM related sensors. The diagnostic procedure is listed on page EC-374. Code P0820 could be thrown.