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C15 Acert BXS shuts off-throws no codes HELP!!!!

Discussion in 'Trucks [ Eighteen Wheelers ]' started by shamrockman, Sep 17, 2013.

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Mr. Haney Road Train Member

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To bring on the idiot lights in the dash, you are losing power on the keyed switched circuit. The problem is in the dash, not the ECM. The speedometer gauge erratic response is also a sign of the same problem with the engine surging when the ECM is getting an erratic 12 volt keyed signal. The ECM reads the speed sensor signal and forwards it to the gauge in the dash. So if the engine is surging erratically while the speedometer is, then the ECM is losing keyed power. This will not leave any fault codes, because the ECM can't tell the difference between someone turning off the ignition switch versus the 12 volt positive signal being interrupted by a broken or corroded wiring harness in the truck somewhere. If you want to run a test to see if it is the truck you need to run a 12 volt positive signal to pin 70. The problem has to be coming from the ignition key source that supplies the 12 volts positive or from the ignition switch or ignition switch wiring harness used to power up the truck after the switch.

Mr. Haney, Sep 19, 2013

#21

cat from the valley and bigguns Thank this.
bigguns Road Train Member

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Mr. Haney You just explained the problem a buddy of mine has been having with his older truck. It makes sense when a person can see it in print. Many thanks.

bigguns, Sep 21, 2013

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red pete Bobtail Member

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shamrockman said: ↑

2 months ago I bought a one owner 2005 Pete 379 with only 505,000 original miles. The truck is show room new in condition inside and out. The manufacture date is 2004 and it has a BXS acert 475 Cat in it. I bought the truck for 25k less than the market knowing that it had a shutting off problem. I thought we could figure it out in no time at all, but here I am 2 months later writing this thread. The truck runs great with no misses at all for days at a time, and then all of a sudden while cruising down the road it will die. The truck will start right back up without any hesitation. It may do it again in 30 minutes or it may be 10 days later before it acts up again. When it dies, it does not set any codes. The part changers at Rush Peterbilt looked at the truck 4 times before I purchased it without finding the problem. Since I bought the truck, Holt Cat has looked at it along with 10 different shops, each of which were confident they knew what was wrong. We have replaced the ignition switch,checked the wires going to the ECM from the battery, changed the batteries around, replaced the acc relay, replaced the shut off timer, checked the oil pres sensor, and unhooked and rehooked every single wire on the truck. One more clue for you, the speedometer just started acting up about 10 days ago, jumping up and down 5mph or so. We put a new speedometer on and cleaned all the connections and it is still bouncing around. Should we try replacing the ECM??? Has anyone had this problem and did replacing the ECM fix it? Thanks so much for any input.
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Hey Did you end up resolving the issues with your truck shutting off having the same issue with my truck. I replaced the ECM with a loaner that peterbilt dealer had and the issue continues to happen!!

red pete, Feb 19, 2015

#23
cat from the valley Medium Load Member

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I am curious also

cat from the valley, Feb 19, 2015

#24
FCTRANS Bobtail Member

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So I googled this and read the entire feed only to find out the outcome was never posted!!! Anyone know what's next?

FCTRANS, Apr 14, 2015

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toybox20 Bobtail Member

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Had the same problem over a year ago when I found this thread. I followed the wire from pin70 and found a short. After fixing the wire haven't had a problem since.

toybox20, Jan 29, 2016

#26
crawldad Bobtail Member

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Not sure if this will help anyone but we have had several 04/05 bxs and mxs cat engines that would momentarily shut off then right back to power without showing a code. I have seen 2 separate causes, first being rubbed wire coming out of battery box. Next being bad wire at crank sensor (usually couple inches before connection at crank driver side around power steering pump.) Yes this has happened with no codes. Leave truck idle and start moving wires at these areas to see if shuts down.

crawldad, Jul 2, 2017

#28

Oxbow Thanks this.
Sam Dyck Bobtail Member

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We hava kenworth C15 went down the road en just like that it shut off no codes coming on nothing everything worked perfect till then it’ll only turn over but won’t fire any help on that ?

Sam Dyck, Oct 4, 2017

#29
Crusty Mech. Bobtail Member

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shamrockman said: ↑

2 months ago I bought a one owner 2005 Pete 379 with only 505,000 original miles. The truck is show room new in condition inside and out. The manufacture date is 2004 and it has a BXS acert 475 Cat in it. I bought the truck for 25k less than the market knowing that it had a shutting off problem. I thought we could figure it out in no time at all, but here I am 2 months later writing this thread. The truck runs great with no misses at all for days at a time, and then all of a sudden while cruising down the road it will die. The truck will start right back up without any hesitation. It may do it again in 30 minutes or it may be 10 days later before it acts up again. When it dies, it does not set any codes. The part changers at Rush Peterbilt looked at the truck 4 times before I purchased it without finding the problem. Since I bought the truck, Holt Cat has looked at it along with 10 different shops, each of which were confident they knew what was wrong. We have replaced the ignition switch,checked the wires going to the ECM from the battery, changed the batteries around, replaced the acc relay, replaced the shut off timer, checked the oil pres sensor, and unhooked and rehooked every single wire on the truck. One more clue for you, the speedometer just started acting up about 10 days ago, jumping up and down 5mph or so. We put a new speedometer on and cleaned all the connections and it is still bouncing around. Should we try replacing the ECM??? Has anyone had this problem and did replacing the ECM fix it? Thanks so much for any input.
Click to expand...

Crusty Mech., Nov 22, 2018

#30

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