Electrical problem
1995 Chevy Silverado V8 Four Wheel Drive Manual 200000 miles
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I have a 1995 Chevy pickup 4 X 4, 350 engine, 200,000 miles; the service engine light comes on sporadically, code 33 and 52, Replaced the MAP sensor and the code 33 went away, so I just get code 52. The manual I have indicates “PCM detects ignition feed voltage greater than 16-volts for 90-min”, but the manual also makes a reference to codes (52 and 53) “represent internal transmission problems”, I have a standard transmission.

The light comes on when I first start up the truck, not in 90 min, this includes when I clear the codes. It also comes on and off after awhile, and then will come back on.

Any help trying to figure this out would be appreciated, what should be checked and how to check it would be appreciated?

GeorgeD

HAve the battery and alt load tested to start.If when you start it, the alt is sensing the battery is toolow, will charge it hard, if too much the code will be set. Be sure all connections are clean and tight first.Check battery cables for acid "leech" down the cables, if present replace them

Had the Battery and Alt checked, both checked out fine. Checked the battery cabels they looked good. The plugs, cap and rotor, hadn't been done for awhile so I did those to. Also replaced the coil.

Now I get the 52 code when it first starts up, then it goes out and so far it doesn't come back on accept when starting?

Sounds like the alt is winging hard to recharge the battery when first started. Have the started load checked, may be drawing too much

Tried a new alternator but it didn’t help.
I drove it out to work and back about 100 miles.
The light was on for a couple of minutes and then stayed off. So I thought it only happened when warmed up, but then on the way home after it was good and warm , the light popped back on for about a minute. Stayed off the rest of the time, can you think of anything else to check?

Thanks,