hey y’all,
It’s been a while since I posted, changed jobs and everything new shop, we towed in a cascadia daycab 2014 dd13 yday for a no start no crank issue, it just clicks when trying to start, it’s an auto shift dt12 transmission. the starter was changed, the ignition was changed, and the def light was flashing low even when full so the def pump assembly was also changed, at this
Shop they use a diagnostic program called jaltest which I hate since I’m used to diagnostic link, we swapped ecu’s with another same truck and still no luck it just clicks, it does not start when the starter is bypassed either, I checked and there is no signal coming to the solenoid wire so I’m assuming the ecu is blocking it? All relays and fuses were checked and there are no codes, however here’s where it gets interesting, the transmission display started showing F for fault, also the diagnostic program will not connect to the transmission module and says there’s a communication error even tho it connects to all other modules no problem which makes me think the Transmission ECU is the problem, I retrieved the codes from the trans display instead and it shows codes 21, 25 and 35, 36 but each one randomly, these also point to the trans ecu, so apart from no signal at the starter, the def light flashing, and no connection with the program, what else could it be? Am I on the right track? Any advice? Where do I go from here?
DD13 no crank no start
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by wtokhi, Dec 10, 2020.
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The master power cutoff switch sometimes goes bad on Cascadias. On my 09 it was under the cab on the driver's side. On my 16 it's a switch on the floor beside the drivers seat.
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Here's a video of a problem that looks like it might be similar to yours.
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BoxCarKidd and lwlevens Thank this.
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Troubleshooting included the following: had power going to the starter, checked fuses, & relay on drivers side fender fuse box. Power Distribution Box on firewall checking all fuses, connections going in and out all were good. Checked clutch switch. It was good. Power switch on the floor was good too. I swapped a CPC from a sister truck, plugged it in and the truck fired right up. DEF gauge read normal with all green bars present, no flashing red light and yellow engine light was present once ignition was turned on and went out once truck started. Just to be certain that the CPC was the root cause of all the said issues, I took the bad CPC from the the problem truck over to the donor truck and plugged that CPC in it's place. Every issue that was wrong with the problem truck now existed in the donor truck. So a new CPC will need to be purchased and it will also need to be programmed before it is reinstalled. I hope this post will help someone experiencing the same issue. -
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sorry for never updating this thread, CPC was the issue on that unit
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