Was shutting down the truck the other day and noticed that my comp box was seized up, I couldn't adjust the levels or turn it off. I checked for codes and got these:
P0500 No Vehicle Speed Sensor Signal
P1693 DTC Detected In ECM Or PCM

I didn't notice anything strange while driving it, and after I turned the truck off and turned the key back on the comp was back to normal. Any ideas what happened? Does anyone know what caused the P0500?

 

Double check your ground.

Dave

 

Been roasting tires lately? I get those two codes when I put on a smoke show. They seem to reset themselves after a few startups. As for the comp being screwy, did you check your codes before you noticed the box being screwy. If I check for codes and then start my truck up without turning it back off first, the box stays "frozen" until I turn it off.

Take care
Mark

 

I have had my drag comp for about a year now. It did that "freeze" thing to me once, reset when I turned the key off, and has not done it since. On mine, level 1, 3, and 5 were lit up, and I could not adjust it or turn it on/off.

 

[quote author=marksmith link=board=7;threadid=22898;start=0#msg214609 date=1069891056]
Been roasting tires lately? I get those two codes when I put on a smoke show. They seem to reset themselves after a few startups. As for the comp being screwy, did you check your codes before you noticed the box being screwy. If I check for codes and then start my truck up without turning it back off first, the box stays "frozen" until I turn it off.

Take care
Mark
[/quote]

Thanks Mark, that's gotta be what it was! I spun the tires for the first time ever last weekend, then on Monday when I parked the truck I noticed that the comp was frozen on level one. I couldn't turn it off or adjust levels. I shut the truck off, then checked for codes and got the 0500; thought the codes were comp-related, but that must have been from the weekend when I was spinning the tires. Thanks again; now if I could just figure out why the comp froze. BTW, after I turned the truck off and turned the key back on, the comp was fine and has been fine since.

 

Mine was freezing all the time then I just turned the key off and restarted and all was well. Sent it out for the Drag Race upgrade and the new firmware no tests yet.

 

Mine did that off and on for allmost a year, finally had it replaced. 8)