unknown DTC

[Rawze]

(08-04-2023 )volvokid Wrote:  ...
this is a 2009 volvo vnl 630 with a cummins isx 871.. truck is demandated and ecm was replaced 2 years... engine has 1.2 million miles no rebuild

Cm871 + intermittent power/cutout and engine dying randomly = almost always an intermittent ecm. Hopefully it is something more simple,. but the odds are in its favor for a bad ecm.

Crank it up, let it idle.. and smack the ecm around almost hard enough to dent its casing. See if it cuts out. If it does, then its a bad ecm. .. and replace the crank shaft damper with a new OEM one while your at it, or the next ecm you install will have the same intermittent issues all over again in a year or 2 as well. If it is a bad ecm.. ONLY PURCHASE AN OFFICIAL REAMAN OR NEW ONE FROM A CERTIFIED DEALERS$IT!!!.. DO NOT BUY A USED OR REPAIRED, REFURB FROM ANY THIRD-PARTY OUTFIT!!!.

-== NEXT .. you say its de-mandated .. so you need to ASAP, also copy that program out of that ecm and e-mail it to me for a proper review of what someone did in there. More than 90% of all de-mandate programs are extremely harmful to the engine and/or the turbocharger. Might as well have sand in your oil.. it is a matter of time, while all the progressive damage a bad delete programming takes its toll on it.
Here is what needs to be done on that front:
http://rawze.com/forums/showthread.php?t...2#pid68742