Speedometer is out I'm guessing speed sensor is gone out but now DPF light is on.

[Rawze]

(07-26-2016 )Earlson Wrote:  New here. I have a 09 Pete 387 with Cummins ISX. Well my speedo started going haywire and is stuck on 25mph. Of course that meant I had no Cruise but I wasn't worried I had only 1,000 miles till home and my mechanic who said should be fine to drive. Well now my dpf regen light is on and while it usually goes off after 60 or so miles it's still on after 200 miles. Never did that b4 and I have about 700 miles left. What should I do?

If it is the speed sensor, it could effect the regen process, but as well, the two problems may also be unrelated and just so happen to come all at once. You need to consider both possibilities and here is why,...

The most common cause of the speedo going haywire and going out in that model truck is in fact the speedo itself going bad and not the speed sensor. For this reason, you need to consider that it may be just that, and a coincidence that you are having regen issue too.

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Then again,... if it is the speed sensor and not the speedo,... it could effect both.


Toss a coin up is anyones guess.

Start by replacing the speed sensor, a good EGR tune-up, clean or replace the Doser injector, do a forced regen. -- That is what I would likely do any ways.