Question about 2002 Jeep Grand Cherokee

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Fix P1494 code

Cleared once, replaced gas cap. Egine light came back on with the same code.

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  • pjh44pj Mar 27, 2009

    I have a 2003 Jeep Gd Chrkee with the same problem. Engine light came on, changed the gas cap - light went off, stayed off for a day or two - came back on, purchase a new gas cap again and the light is still on.
    Thought that it might be to much sulfer in gas - used a different gas company the last to fill-ups then normal , - added additives to gas to clean system and then refilled tank with higher rated gasoline. Ran car for a hour on new tank of gas - light still on. Believe that I have same problem as 2002 Jeep. What do you think?

  • ray c Apr 02, 2009

    03 Grand cherokee with the engine light on. Replaced gas cap and reset code twice only for it to come on again. What is the solution?

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This code is caused by the leak detection pump for the evaporative emissions control system, this is a common fault in your year and model, there are factory bullentins about the code, to replace the pump do the following. As noted in the procedure pay close attention to the condition of the vacuum lines to the pump.


The LDP, (leak detection pump) is located in the left/front corner of engine compartment below the air cleaner housing. It is mounted to left/front inner fender sheet metal. The LDP and LDP filter are replaced (serviced) as one unit.

Posted on Mar 04, 2009

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