Error code P0499

Tiny
MIKE MCCALLIE
  • MEMBER
  • 2004 DODGE DAKOTA
  • 3.7L
  • V6
  • 2WD
  • AUTOMATIC
  • 176,000 MILES
Local service technician stated "current code: leak detection pump canister vent valve solenoid high. No TSB's or recalls. Concerning current codes. Have power and ground to leak detection pump (LDP). Found LDP testing bad. Recommended starting with new LDP but may still have PCM problem. Replaced LDP and cleared codes. Code came right back. Suspect PCM problem. Recommend dealer to check PCM." I know taking it to dealer will cost a fortune. So, is there a way to reset the PCM to fix the problem? If not, I assume that I could purchase and install new PCM and that would fix the problem? Thanks.
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Monday, June 19th, 2017 AT 6:58 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
I cannot tell if you are stating what the mechanic wrote on the repair order or if that is what you did. The problem is diagnostic fault codes never say to replace parts or that one is bad. They only indicate the circuit that needs further diagnosis. In this case the code is caused by a break in the circuit, and that is most often due to a corroded connector terminal. Next would be a cut wire or a bad pump motor. The last thing on that list would be the engine computer. It tried to run the pump but detected the open circuit.
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Monday, June 19th, 2017 AT 9:15 PM
Tiny
MIKE MCCALLIE
  • MEMBER
Thanks. The reply was from the service technician. As for the corroded connector terminal are you referring to the four connectors at the PCM? If so, they are fine. The battery cables are fine as well. Also, the technician replaced the leak detection pump so that should not be the problem. That leaves me with the PCM, right? Can it be reset by me or can I replace the PCM?
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Tuesday, June 20th, 2017 AT 7:57 AM
Tiny
CARADIODOC
  • EXPERT
I wasn't clear in my explanation. The computer can detect hundreds of defects, and the fault codes get very specific as to which circuit has the problem. Don't worry about the battery cables and things like that. This code refers to the wires related to the leak detection assembly, and that assembly. Specifically, terminal number 8 at the Engine Computer is a white / dark green wire going to the leak detection assembly. That wire can have a break or cut in it, but a corroded or stretched connector terminal is a better suspect. The leak detection assembly also has a ground wire that competes the circuit that has the problem, therefore, that black wire also needs to be checked for breaks or a corroded terminal where it bolts to the body. This ground is listed as being near the battery. That is a good place to find a corroded connection from acid leaking from a battery that's about to fail.

The Engine Computer is part of this circuit too, but they cause very little trouble. Even the terminals in that connector are very reliable, so those should be the last suspects after everything else is ruled out.
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Tuesday, June 20th, 2017 AT 9:51 PM

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