ctaylor6566 Posted December 21, 2022 Share Posted December 21, 2022 Who has any idea what is going on with my truck, 2013 CXU630. I'll be driving and it seems like it loses half its power, turbo psi is only like 20 instead of 35-40, speedometer gauge reads zero, digital display shows - -? for mph, and there is an "I" on the display screen by where it shows what gear im in. No cruise control or engine braking works either while it does this. Is this heard of or do I have a wiring gremlin I need to figure outm Quote Link to comment https://www.bigmacktrucks.com/topic/70901-2013-mack-cxu630-while-driving-losing-half-power-wont-show-speed/ Share on other sites More sharing options...
Joey Mack Posted December 21, 2022 Share Posted December 21, 2022 Do you have an M-Drive tranny or Eaton Auto Shift, or I-Shift?? you also called it a CXU 630.. did you mean 613? 1 Quote Link to comment https://www.bigmacktrucks.com/topic/70901-2013-mack-cxu630-while-driving-losing-half-power-wont-show-speed/#findComment-518785 Share on other sites More sharing options...
ctaylor6566 Posted December 22, 2022 Author Share Posted December 22, 2022 Ya it's a Mdrive, and yes 613 sorry about that. Quote Link to comment https://www.bigmacktrucks.com/topic/70901-2013-mack-cxu630-while-driving-losing-half-power-wont-show-speed/#findComment-518800 Share on other sites More sharing options...
Joey Mack Posted December 22, 2022 Share Posted December 22, 2022 If it were me I would check all the grounds.. they are the gray wires through out the harness'. under the top dash panel you can see some grounds, above the throttle pedal is some, and outside on the fire wall, is a pass through, and there is where i have found loose wires.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70901-2013-mack-cxu630-while-driving-losing-half-power-wont-show-speed/#findComment-518801 Share on other sites More sharing options...
mdixon Posted December 29, 2022 Share Posted December 29, 2022 If your speed sensor goes, generally it won't rev over 1500. It thinks your in neutral, probably keep you from building boost and would definitely explain the lack of speedo. I only have experience with manuals though so...? Quote Link to comment https://www.bigmacktrucks.com/topic/70901-2013-mack-cxu630-while-driving-losing-half-power-wont-show-speed/#findComment-519215 Share on other sites More sharing options...
Mackpro Posted December 29, 2022 Share Posted December 29, 2022 One of our 2013 CXU’s de-rated and lost the speedo ( dashes in the screen) , lightning bolt on , ABS /ATC light on. Had active codes for both front wheel speed sensors . Tested and both bad. Replaced both sensors and the tone wheel on one hub. Cleared codes and did 15 mile test drive . All ok. This was a manual trans truck. I know the M-drive trucks will derate on certain ABS codes but was unsure on manual transmission trucks till today. Quote Link to comment https://www.bigmacktrucks.com/topic/70901-2013-mack-cxu630-while-driving-losing-half-power-wont-show-speed/#findComment-519250 Share on other sites More sharing options...
ctaylor6566 Posted January 5, 2023 Author Share Posted January 5, 2023 Thanks everybody for the help and direction, turned out to be a bad transmission output speed sensor, been running good so far. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/70901-2013-mack-cxu630-while-driving-losing-half-power-wont-show-speed/#findComment-520093 Share on other sites More sharing options...
Joey Mack Posted January 5, 2023 Share Posted January 5, 2023 Its good that you posted the 'fix'.. jojo Quote Link to comment https://www.bigmacktrucks.com/topic/70901-2013-mack-cxu630-while-driving-losing-half-power-wont-show-speed/#findComment-520099 Share on other sites More sharing options...
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