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Service Indicator Comes On Early?

19K views 17 replies 11 participants last post by  XJ12 
I checked the diagnostic page on mychevy.com. It updated our mileage, and ran whatever checks it does. Came back with all green boxes. Everything AOK. Don't know whether to be encouraged or discouraged by that. Anyway, made an appointment to take it into our local dealer to have them check for fault codes, on Monday. Have my fingers crossed.
 
Just went out and turned it on, for the fourth time, and now the "Service Vehicle Soon" light is out. Won't get much rest between now and Monday afternoon. :-(
 
Went to the local dealer this afternoon. The service manager came right out with a laptop, and plugged it into the service port. The codes said the problem was with the battery relay in the High Power Distribution Module. The computer monitors the relays for open/close times. It took too many milliseconds to open once. The test procedure called for him turning the car on, and off ten times, in succession, with the diagnostic computer hooked up. It operated within specs those ten times, so we are good to go, until/unless it happens again. Sounds like I might want to carry a rubber mallet, in case it sticks and hangs. Only half kidding. :)
 
It's hard to know whether to be happy about the extensive checking that the car is doing or to be incredibly annoyed at how sensitive it is to transient problems...

It seems to me that they could do a better job of logging these exceptions for later diagnosis and not bothering the driver about them unless they actually become some sort of operational issue.
I am definitely glad they are monitoring everything. As for being kept in the dark about it, I prefer to know what is going on. What is frustrating is the sense of impotence that solid state electronic devices give. If this thing had old magnetic relays, with contactors, the failure rate would be higher, but you could look at it, see the stuck contactor, or see the soot around the offending one, and sand it with a match book striker, and get home. An SSR, like everything solid state, is a magic rock. If you pulled the cover off the HPDM, you might see soot, if the SSR had cooked completely, but everything is potted in epoxy, and nothing you could jerry rig anyway.
 
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