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HDLP Fault - Please help

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by ZooX, Mar 5, 2020.

  1. Mar 5, 2020 #1
    ZooX

    ZooX Bobtail Member

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    I got this message on the dash screen ONLY when I switch on high beam light (light itself is gone, not working). I checked all the connectors all look clean and intact. First it started with driver side low beam light blinking occasionally and now low beam is consistent but driver side high beam gone.

    No fault message at all when high beam is not switched on. If I do, the message comes up and only passenger side high beam is working.

    Thank you truckers and mechanics.
     

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    ZooX, Mar 5, 2020
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  3. Mar 5, 2020 #2
    Goodysnap

    Goodysnap Road Train Member

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    Ok so you have a Paccar product. Which model? 386?

    Is the LH high beam the only headlight not working? Right side low and high are good?

    9007s are common for melting pigtails with too high wattage bulbs. Have you gone exploring yet?
     
    Goodysnap, Mar 5, 2020
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  4. Mar 5, 2020 #3
    ZooX

    ZooX Bobtail Member

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    388.

    yes the LH high beam is the only headlight not working. right side both lights are fine. there is no melting pigtail.

    It started with LEFT LOW blinking. Replaced 9007 low beam then blinking fixed but LEFT HIGH went off. Does it imply anything as the fault message comes up only when high beam is switched on?
     
    ZooX, Mar 5, 2020
    ZooX, Mar 5, 2020
    #3
  5. Mar 5, 2020 #4
    Goodysnap

    Goodysnap Road Train Member

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    If ever the circuit is open, bulb or wire the controller senses no load and the fault comes active. This is why you only have the fault when that light is being used.

    Check inside the headlight bucket for rubs or green wires by giving a tug on each wire. From there check around the hood hinges for rubs or damage to exposed wires. If you have no or low voltage you have a green wire between the chassis node and the headlight bulb.
     
    Goodysnap, Mar 5, 2020
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  7. Mar 10, 2020 #5
    ZooX

    ZooX Bobtail Member

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    Can you please explain this part? - If you have no or low voltage you have a green wire between the chassis node and the headlight bulb.

    Turned out low beam blinking had nothing to do with high beam going out. HDLP message disappeared after just replacing high beam light. I thought low beam blinking affected high...
     
    ZooX, Mar 10, 2020
    ZooX, Mar 10, 2020
    #5
  8. Mar 10, 2020 #6
    Goodysnap

    Goodysnap Road Train Member

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    Sounds like you just had a open bulb then? No explanation needed as you have no wiring issue if all are working.
     
    Goodysnap, Mar 10, 2020
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