steve p Posted February 6, 2022 Share Posted February 6, 2022 I have a active fault showing on the Co Pilot , Engine ECU, Solenoid Boost Voltage , Voltage low or shorted to battery. i have a V MAC 3 Service manual 8 211 . blink code 8-9 mentions solenoid boost voltage , can anyone elaborate more on this fault . Thanks ,Steve Quote Link to comment Share on other sites More sharing options...
JoeH Posted February 6, 2022 Share Posted February 6, 2022 @Joey Mack Quote Link to comment Share on other sites More sharing options...
mrsmackpaul Posted February 6, 2022 Share Posted February 6, 2022 Sorry I'm of no help at all Paul Quote Link to comment Share on other sites More sharing options...
Laura Posted March 22, 2022 Share Posted March 22, 2022 Hi did you ever find out the problem. My husbands truck same truck has this same fault. Quote Link to comment Share on other sites More sharing options...
Mackpro Posted March 23, 2022 Share Posted March 23, 2022 Make sure battery cables are tight on batteries and starter first. In my notes for this code , check wires on ground breaker and auxiliary starter solenoid on the outside of the firewall by the wiper motor. The ground break will be rectangular shape with black wires , right next to it is the round shaped auxiliary starter solenoid with red wires, make sure they are tight . But be careful on thoses two as over tightening can break them easily. Lastly, unplug the 2 or 3 connectors ( if you have a ASET AC engine) on the engine ecm and check for coolant in the connector and rotten pins , Quote Link to comment Share on other sites More sharing options...
steve p Posted April 9, 2022 Author Share Posted April 9, 2022 Mackpro, I ended up replacing the engine harness but not before cleaning all the earths and reinstalling them ,replaced the auxillary soleniod along with all the engine sensors, swapped out the computer with a known working computer still the same fault ,throwing out ECM fault plus boost soleniod fault . We didn't get the ASET AC engine here in Australia .Mack Trucks Aust weren't any help at all, Grey engine amnesia???? I ended up sorting the problem by elimination , My E9 was starting to look good sitting in place of the CCRS 470, Thanks Mackpro for responding with help Quote Link to comment Share on other sites More sharing options...
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