2012 4900 dd15 engine light

Discussion in 'Western Star Forum' started by WestStarHHRM, Mar 24, 2023.

  1. WestStarHHRM

    WestStarHHRM Bobtail Member

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    Mar 24, 2023
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    Hey so our 2012 western 4900 with the DD15 is throwing a engine light on the console. The engine fan won't shut off and there's a slight loss of power. Turbo runs about 5 to 7 psi lower than normal. First off it's been deleted so this isn't a def issue. It's not pulling any codes when we check it so I'm just trying to figure out what to do. Trucks been deleted over 4 years now with no issues so I'm sure its not that
     
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  3. JB7

    JB7 Medium Load Member

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    Dec 13, 2022
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    Check that the fan is not locked all the time with the air pressure at 100psi or more. With key off engine off try to turn the fan, with key on engine off (KOEO) try to turn the fan. If it is not locked all the time trace the air line from the fan back to the firewall. The fan solenoid at the firewall is likely the problem. Check for power there. There is an April 2012 thread on this issue on this site under Trucks (Eighteen Wheelers) - Detroit Fan Clutch on all the time.
     
    Last edited: Mar 24, 2023
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