What are the codes 900, 920, 921, 940, 950, 999 ? I cant find anything that tells me what they mean.

 

Are you talking about "P" codes ... ie. P0900?

 

P0900 - Clutch Actuator Circ/Open
P0920 - Gear Shift Forward Actuator Circ/Open
P0921 - Gear Shift Forward Actuator Circ Range/Perf
P0940 - Hydralic Oil Temp Sens Circ Hi
P0950 - Auto Shift Manual Ctrl Circ
P0999 - Shift Solenoid F Ctrl Circ Hi

If that's what your looking for.

 

These come through the trip odometer.Just straight 3 digit codes. From my wanderings tonight, I found it "might" be the PCM. But my truck still runs and those i found online had stalling problems.

 

From the looks of it ... tranny trouble.

 

On a manual transmission? I'm digging in to the PCM area to see if the rain got to the connections.

 

So if its my PCM, I'm in trouble. Factory parts are $726.00 and the Wrecking yard can only find one in Idaho and a couple in Montana. crap. So much for my Daily Driver.

 

IS there a power upgrade that REPLACES the PCM?

 

On 99 trucks 920-921-999 all mean that the signal from the computer was lost.

Peter Hatch

 

When I was troubleshooting all this, I was turned on to a Diesel guy here in town. We hooked it up and all was well. Our thought was a connector came loose somehow/ somewhere. I took it home to start looking for bad connectors. ON MY WAY HOME, I pulled off the dash surround and tossed it into the back, looked at the road and back to my gauges and POOF, all were back to normal. Have been ever since. I spent some time looking around, but nothing was out of order. I just hope that it was a fluke and not a "timer trip" that another vehicle I had in the past had. SOME manufacturers have timers on their check engine lights to force you to take it to a mechanic at certain mileages. This tripped at EXACTLY 240,000 KM. (canadian built truck in Oregon). Made me think, because almost exactly 10km went by and it fixed itself.