I have an 09 Accord with codes 121-01, 121-21 VSA solenoid valve malfunction. I have good power and ground and the connection is good at the module. I’ve read that it’s possible the VSA might need to be updated. Seeing if anyone else has experienced this issue and if an update would solve the problem. The issue is it would have to go to the dealer to see if it even needs an update because they would have to hook up their HDS. So I’m looking at $130 just to scan the car for possible update. The car is 10 years old so I’m pretty sure the modulator itself is probably no good.
Thanks