Question about 1999 Jeep Grand Cherokee
This fault code indicates there is a problem with the leak detection pump switch or a mechanical fault in the pump.
The leak detection pump is part of the evaporative emissions control system. It is part of the self-test system that makes sure the evaportive emission system is working properly. The pump applies vacuum to the system to check for leaks.
This code is set by the PCM when the switch for the LDP is found to be in the wrong position at start-up. This can be caused by a faulty switch in the pump or a mechanical failure in the pump - either way the pump assembly needs to be replaced to address the issue.
Clear the code with a code reader or by disconnecting the battery and drive the vehicle for a while to see if the code comes back. If the code comes back make sure to inspect all the wires for any type of short or issues before replacing the pump. The pump is located under the rear of the vehicle near the fuel tank. Dealer list on the pump is about $140.00. It should take less than an hour to switch out.
Your local trusty auto repair facility can perform a full diagnostic on the system to ensure that is your problem.
Posted on May 27, 2011
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Posted on Jan 02, 2017
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