4 DEF PUMPS WENT BAD IN 1 MONTH

Discussion in 'Volvo Forum' started by Buddyboy6Jr, Aug 25, 2021.

  1. Buddyboy6Jr

    Buddyboy6Jr Bobtail Member

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    Sep 22, 2020
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    I HAVE A 2012 VOLVO VNL THAT HAS HAD 4 DEF PUMPS GO BAD IN 1 MONTH WE INSTALLED A REMAN. THEN INSTALLED A NEW PUMP. WE HAVE A GOOD USED ONE ON NOW BUT WE ARE NOT SENDING IT OUT TELL WE CAN FIGURE OUT WHAT THE ISSUE IS
     
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  3. unicorn63454

    unicorn63454 Bobtail Member

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    Jan 27, 2017
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    Harness
     
  4. jason6541

    jason6541 Road Train Member

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    Mar 5, 2012
    Omaha, NE
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    Is filter plugged and causing the pump to work harder than needed.
    Voltage spikes or a harness full of corrosion. Bad emissions ecu Hook to VCADS
     
  5. nasriza

    nasriza Road Train Member

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    Feb 1, 2013
    Chicago, IL
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    the pumps come with new filters check the harness going to pump i've seen that fail a lot of times, also check make sure acm module is getting the proper current flow ive had that happens as well. how are you guys determining the pump is bad what are you seeing as far as diagnostics go.
     
    jason6541 Thanks this.
  6. Inderjit

    Inderjit Medium Load Member

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    Sep 17, 2017
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    There is a valve that controls the coolant flow through the heater tube
    in the DEF tank. I'm just guessing but could it be stuck open?
     
  7. Ross_Tech

    Ross_Tech Light Load Member

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    133
    Aug 31, 2021
    Michigan
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    Check the FCUT connector next to the ACM. It usually corrodes within 12 inches of that connector. Make sure your checking powers and grounds with them plugged in.
     
    QUALITYTRUCK and jason6541 Thank this.
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