Four Codes - Need help on how to resolve/repair

[frank1]

Finally had some plowable snow, went out for about four hours. Noticed that the temp. gauge was slightly passed 210* and the engine light was on (top left corner). Thought I had the plow raised up to far while going from site to site and not allowing enough air to get to the radiator, lowered the plow about six- to eight inches, helped a little bit still temp. never dropped below 210*.
Parked truck for the day and checked codes : P0602, CONTROL MODULE PROGRAMMING ERROR ???? PO483 cooling fan speed- possible high temp. readings? P2146 & P2149 - Fuel injector group 1 & 2 supply voltage circuit???? Any help on where / how to repair these codes would be greatly appreciated. 2003 Automatic, 158,000 miles.
Thanks, Frank

 

[cerberusiam]

As a guess sounds like you have an ECU going tango uniform, or, a bad programmer load. The other codes could be the result of the P0602 or the cause.

 

[p-Bar]

Try a battery disconnect to reboot the computer. Hail Mary

 

[Prairie Dog]

I suspect it all revolves around the cooling fan speed error. When the fans fail they often pull down the bus they are on and cause all sorts of false codes. I would unplug the fan, clear the codes and see what returns. If all you get is another fan code then that is your only problem. When you replace the clutch for the fan, only use a official Cummins or Dodge part. All others cause more problems.

 

[frank1]

Thanks for all the suggestions. I will do the batteries and fan disconnect tomorrow and see what happens.Thanks again.

 

[Prairie Dog]

The codes wont clear for a certain number of starts but will no longer be "active" - except the one for disconnecting the fan.

 

[DonFitzwater]

For some of you smarter guys......won't a failing fan clutch give strange codes revolving around injector power supply? If that truck is very old and you do plow a lot, you might put a fan clutch on for preventative maintenance.

 

[Prairie Dog]

The problem is an OEM fan clutch is more than $400 so kind of expensive to shot-gun.

 

[cerberusiam]

For some of you smarter guys......won't a failing fan clutch give strange codes revolving around injector power supply?

Not usually, the electronic portion of the fan fails and pops that code but rarely doe sit effect anything else. The rare extreme circumstances are when the fan actually shorts internally usually cause many more problems than just injector codes. The fan is controlled by the ECU so throwing bad signals directly into it definitely has unknown results. The problem is there is no good cheap alternative to an OE fan, you can still get the same code and having cooling issues with a Doorman replacement. It is like buying injectors, not going OE has ramifications.

 

[frank1]

Quick update: Did a few quick checks on the operation of the clutch fan, spins freely and no play (w/ engine off). Engine running took a rolled up news paper and tried to stop fan, could not. Disconnected batteries for about thirty minutes, started engine,check engine light went off for about five minutes then came back on. Took plow off drove truck for about forty minutes temp. always stayed below 200*.Came back checked service log for this particular truck and noticed that the thermostat has not been changed out in 101,000 miles. Ordered both a need fan clutch and 190* thermostat from cummins, should have by the end of the week. Still throwing same codes.

 

[frank1]

Friend came over this afternoon with a scan tool. He removed all codes and check engine light is also off. Took the truck and ran around town and down local highway for about forty minutes, temp sat right at 200*. Came back home parked truck, cycled through key switch three times and P0602 (control module programming error ), showed up again! No other codes. Friend also asked if we removed the clutch fan from the truck could we do a bench test on it? To rule out the fan clutch. Any other suggestions would be helpful.
Thanks,Frank

 

[Prairie Dog]

The tests you did will not reveal the fans electronic failure mode. In other words, the fan could feel perfectly fine and still be bad.
While I'm starting to think its' probably not the issue, Unplugging it isn't hard and will rule it out. The tests you did wont do that.
There is no reason to remove the fan from the truck to "bench test" it (which you cant do) and why would you? The simple test I described is much easier.

 

[crabman]

Do not overlook the wiring that goes to the fan clutch, check the wiring very carefully for any damage & plug for loose pins. Takes a few minutes to do & could save you $ & down time.

 

[frank1]

Quick update- Finally had to bring truck to local shop--- bad ECM!!! Also, power cable to ECM needs to be replaced plus two grounds! Should have truck back this coming Friday to a tune of $2,000.00 ! Hopefully that's the final expense for this truck (this year anyway!!!). $6,400.00 for a built transmission from Level 10 Transmission, $1,500.00 turbo (Tater), new front end - Borgenson steering box and shaft, steering box brace, 2007 steering linkage, front rotors and brakes, rear rotors and brakes (also parking brake pads and cable), all new brake lines and rear u-joint $3,400.00. Total $13,300.00, was considering a new truck earlier in the year ... just did't want to have montly payments and this truck and my others work out just great for me and my business! Thanks again to all with all your suggestions you guys really know these trucks!
Frank