Odd Trouble Codes

[nvrenuf]

I've got codes in my crew cab I can't figure out - 58 and 75.

I have a GM (not Haynes, Chilton, etc) service manual specifically for my truck but I cannot find a listing for these codes. Any ideas?

Oh yeah - the truck is a '91 V3500 crew cab w/ 350 & 4L80E.

 

[surpip]

58: Transmissission Fluid Temperature high. CAUSE: Tranny fluid teemp higher than 309*F for greater than one second.

75: System Voltage Low. CAUSE:system voltage <7.3 at low temp. or <11.7 at high temp for 4 seconds.
thisis from chilton hope it helps

 

[nvrenuf]

Thanks dude!! That first one is kinda scary.

 

[surpip]

ya no kiddin thats kinda high, might want to slap a cooler on it

 

[Thunder]

Yeah both of those are trans codes. Either your tranny got hot. Or the sensor is going bad or a bad connection.

 

[nvrenuf]

Well, it's got a big cooler on it but it has been acting weird over the last week. I can feel the conter locking up constantly (when I don't think it should) and it's "hunting" some because of it.


This is really annoying because the tranny was rebuilt 14 months ago.