steve r Posted February 5, 2023 Share Posted February 5, 2023 2016 Mack CHU MP-8 The engine shut down light is on the truck runs fine it doesn't shut down .Engine fan is fully engaged getting codes 4812 4813 and 647 Changed both solenoids on oil filer housing wires look good getting 2.5 volts to both solenoids key on truck off. I did notice when i picked the truck up the engine oil temp gauge was going up and down while driving back to shop haven't run it long enough since changing the solenoids to know if that stopped . Still have same codes and shut down light is on any thoughts? Quote Link to comment https://www.bigmacktrucks.com/topic/72474-shut-down-light-code-4812/ Share on other sites More sharing options...
Mackpro Posted February 5, 2023 Share Posted February 5, 2023 The 2 oil solenoids on the oil filter stand should have 12 volts to them . They share the same fuse. If one shorts out bad enough to blow the fuse it sets the code for both solenoids. Wiring to the solenoids rubbing on the engine also can blow the fuse as well. Each has a wire that runs back to engine ECM . The engine ECM controls/grounds the return wires to close the solenoids independently. Quote Link to comment https://www.bigmacktrucks.com/topic/72474-shut-down-light-code-4812/#findComment-524639 Share on other sites More sharing options...
Mackpro Posted February 5, 2023 Share Posted February 5, 2023 Fuse 43 is the fuse . 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72474-shut-down-light-code-4812/#findComment-524641 Share on other sites More sharing options...
steve r Posted February 5, 2023 Author Share Posted February 5, 2023 Thankyou for quick reply I will recheck the fuses tomorrow also I didn’t know how many volts they called for will let you know thanks Quote Link to comment https://www.bigmacktrucks.com/topic/72474-shut-down-light-code-4812/#findComment-524646 Share on other sites More sharing options...
Solution Mackpro Posted February 5, 2023 Solution Share Posted February 5, 2023 I believe the fuse is in the fuse box down by where the clutch pedal is . I didn’t write that down in my notes Quote Link to comment https://www.bigmacktrucks.com/topic/72474-shut-down-light-code-4812/#findComment-524655 Share on other sites More sharing options...
Joey Mack Posted February 5, 2023 Share Posted February 5, 2023 Here is a legend from a CXU.. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72474-shut-down-light-code-4812/#findComment-524659 Share on other sites More sharing options...
steve r Posted February 6, 2023 Author Share Posted February 6, 2023 Thankyou gentleman that was it , never even seen the fuse when first checked its a mini fuse on the top all the other fuses which are the taller circuit breaker style .And yes it is the fuse panel near clutch pedal , on the right side very top spot 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72474-shut-down-light-code-4812/#findComment-524690 Share on other sites More sharing options...
Joey Mack Posted February 6, 2023 Share Posted February 6, 2023 Great. Thanks for posting the fix... Jojo Quote Link to comment https://www.bigmacktrucks.com/topic/72474-shut-down-light-code-4812/#findComment-524691 Share on other sites More sharing options...
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