TimberJack Posted February 8, 2018 Share Posted February 8, 2018 2003 E-tech seemed to lose power and had a skip. Check the codes and had a 8-6 # 6 EUP and a 8-9 Solenoid Boost Voltage. What should I check for the solenoid boost problem? Quote Link to comment https://www.bigmacktrucks.com/topic/52444-8-9-code-solenoid-boost-voltage/ Share on other sites More sharing options...
steeler Posted February 8, 2018 Share Posted February 8, 2018 I've had a bazillion trucks with the 8-9, never had one with it active yet. Is it active? If not, I would ignore it and go after the 6. I was thinking that with an active 8-9 the engine will not run, but not certain about that here sitting at home and not at the shop. As far as the 6, check the wires close to the unit pump for bare spots. Could also be a failed pump. Quote Link to comment https://www.bigmacktrucks.com/topic/52444-8-9-code-solenoid-boost-voltage/#findComment-391462 Share on other sites More sharing options...
TimberJack Posted February 8, 2018 Author Share Posted February 8, 2018 It was active, engine seemed to lost a lot of power. Have to drop gears pulling a empty log trailer that I never had to do before. Quote Link to comment https://www.bigmacktrucks.com/topic/52444-8-9-code-solenoid-boost-voltage/#findComment-391470 Share on other sites More sharing options...
Javier PR Posted July 8, 2020 Share Posted July 8, 2020 On 2/8/2018 at 4:32 AM, TimberJack said: It was active, engine seemed to lost a lot of power. Have to drop gears pulling a empty log trailer that I never had to do before. Did you ever find out what was the problem? I have the same eup 8-4/low voltage 8-9 thanks Quote Link to comment https://www.bigmacktrucks.com/topic/52444-8-9-code-solenoid-boost-voltage/#findComment-455307 Share on other sites More sharing options...
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