1. Missed the live Ask the Expert event?
    Catch up on the conversation with Ken Hutcheson, President of U.S. Lawns, in the Franchising forum.

    Dismiss Notice

Walker Engine Service Light.

Discussion in 'Mechanic and Repair' started by ATouchofGrass, May 16, 2008.

  1. ATouchofGrass

    ATouchofGrass LawnSite Senior Member
    Male, from CT
    Messages: 506

    I have a Kohler 26 HP EFI in my Walker 48" GHS. Yesterday i was finishing up cutting one of uor larger accounts and noticed that i wasnt getting enough power in some areas, where ive had FULL power a weekago. It bogged down when i hit some higher grass thinking it was the blades that needed to be changed. Well i finished and parked it. Went and trimmed the lawn and came back blew everthing off and went to start it and put it on the trailer, I noticed that the Service Engine Light had come on and would go off about 3 or 4 seconds later. Today i went and did the "self test" by turning the ignition to the run position (3 times) and then let the light flash, it flashed for me 4-2 which is 42. If i could get any insight on this problem that would be fantastic! And should i just take it to my local Kohler Certified Dealer? Not too sure if i have to take it to a "Walker dealer".:confused:
  2. ATouchofGrass

    ATouchofGrass LawnSite Senior Member
    Male, from CT
    Messages: 506

    Any ideas?
  3. fixer67

    fixer67 LawnSite Silver Member
    Messages: 2,098

    Code 42 is temp senor shorted to ground. You have a wire going to the temp senor that is shorting out against the frame or the temp senor is shorted "closed" Give me an email address and I will sent you a PDF with the code infor. You can PM me the email address if youdo not wish it posted in the open.
  4. XterraJohn

    XterraJohn LawnSite Member
    Messages: 178

    I posted this in your other thread, but it may be more relevant here:

    I googled and found a Kohler service manual online:


    On page 99, it lists two possible causes for a blink code of 42:

    Temperature Sensor Circuit: Shorted to Ground
    Temperature Sensor Circuit: Open Circuit or Short to Battery

    Either way, it sounds like it's most likely a wiring problem concerning the temperature sensor. Look for any loose/disconnected wires, or any wires that have the insulation rubbed off of them allowing them to short.

Share This Page