Gord Josephson Posted September 17, 2017 Share Posted September 17, 2017 (edited) I have a glitch with my truck where I lose power and engine brake function. I have had the truck at two separate dealers and they cannot identify the problem. One possible reason could be something in the wiring harness. My electrical fault light will also be on on the dash while this is occurring. It clears itself up while driving sometimes and other times it will clear itself up by turning ignition on and off. Any suggestions? Edited September 17, 2017 by Gord Josephson Quote Link to comment https://www.bigmacktrucks.com/topic/51007-power-loss-engine-brake-loss/ Share on other sites More sharing options...
Mack Technician Posted September 22, 2017 Share Posted September 22, 2017 On 9/17/2017 at 10:02 AM, Gord Josephson said: Any suggestions? 1. Always list your truck year, make and model. 2. Never date girls who hate their mom. 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/51007-power-loss-engine-brake-loss/#findComment-380358 Share on other sites More sharing options...
Stickhauler Posted October 10, 2017 Share Posted October 10, 2017 I may have same issue. 05 E7 427 with 549k miles. Engine brake activates as normal but will not deactivate with switch, go pedal, or clutch. Pull over let engine idle with Jake switch off, all returns to normal. Have also had unexplained loss of power twice. Resembles loss of turbo. Pull over, idle good to go. ???? Quote Link to comment https://www.bigmacktrucks.com/topic/51007-power-loss-engine-brake-loss/#findComment-382039 Share on other sites More sharing options...
theakerstwo Posted October 11, 2017 Share Posted October 11, 2017 If you have a check engine light coming on then read that code.May be losing the VSS signal. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/51007-power-loss-engine-brake-loss/#findComment-382111 Share on other sites More sharing options...
Stickhauler Posted October 11, 2017 Share Posted October 11, 2017 Yes I do. Is there a way to pull the code without taking it to Mack? They charge $350 just to hook it up Quote Link to comment https://www.bigmacktrucks.com/topic/51007-power-loss-engine-brake-loss/#findComment-382126 Share on other sites More sharing options...
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