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Codes, codes and more codes. Don't know where to start..

Marvin
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Marvin

Marvin

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I have a 99 Dodge Ram 3500 4x4 diesel and I am getting codes, PO237PO251PO252P1688P1693 I know what they read, just not sure I know where to start first. Any suggestions would be greatly appreciated. Thanks!!

stodg73

stodg73

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Get a scan tool and erase the codes first, then drive it around for a bit, or start it up and see which ones return.The P0237 is an over boost code, not to worry too much yet.The P0251, P0252 mean that you are needing to get a new VP 44 injection pump because the internal moving parts are broken/stuck. You might try some 2 stroke oil in your fuel to see if that helps the codes. As the 2 stroke will add lubrication to the fuel for the VP. For your use, you might try 1.5 ounces to 1 gallon of fuel for the first tank. Then go to 1 oz to 1 gallon for the rest.The P1688 means there is an internal failure in the VP.The P1693 is just a companion code to tell you there are other codes set in the PCM/ECM. Not to worry about.The codes that have me concerned are the P0251, P0252, and the P1688, these are generally the death codes for the VP.Others will chime in.

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Mopar1973Man

Mopar1973Man

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Stodg is for the most part correct... P0237 - http://forum.mopar1973man.com/threads/2571-P0237-Map-Sensor-Voltage-Too-Low P0251 - http://forum.mopar1973man.com/threads/2573-P0251-Fuel-Inj.-Pump-Mech.-Failure-Fuel-Valve-Feedback-Circuit P0252 - http://forum.mopar1973man.com/threads/2648-P0252-Fuel-Valve-Signal-Missing P1688 - http://forum.mopar1973man.com/threads/2627-P1688-Internal-Fuel-Injection-Pump-Controller-Failure P1693 - http://forum.mopar1973man.com/threads/2631-P1693-DTC-Detected-in-PCM-ECM-or-DTC-Detected-in-ECM

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Marvin

Marvin

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Thanks so much for the info. I sure will try that and I will let y'all know.
Marvin

Marvin

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Thanks MM!! Looks like DAP has the best kit deal. Who would you recommend? Also, where would you recommend purchasing a low pressure fuel gage kit?

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