Mopar1973Man
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Mopar1973Man's post in Truck runs great but P0252 P0253 was marked as the answerP025x codes basically mean the VP44 has issues with the PSG and the timing and fuel solenoid working correctly. The only way to fix it is the replacement of the VP44.
My full error code list with diagnostic info.
https://mopar1973man.com/cummins/articles.html/24-valve-2nd-generation/engine/obdii-error-codes/
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Mopar1973Man's post in How to test VP44 overflow valve was marked as the answerAll right here...
http://articles.mopar1973man.com/2nd-generation-24v-dodge-cummins/25-fuel-system/88-bosch-vp44-injection-pump-overflow-valve
The bottom hole is only for air bleed it too small for cooling. Even Bosch states 70% of the fuel should be return for proper cooling and there is no way you can get proper cooling in that tiny hole.
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Mopar1973Man's post in Intermitten P1689 was marked as the answerFuel pump relay is in the PDC which controls power the the VP44 injection pump. Yes a bad relay will set a P1689 code if the relay is bad or no power given to the VP44.
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Mopar1973Man's post in Brake Light issue was marked as the answerSOLVED
Make sure you get an 03 to 06 loom for the taillights. Funny part is 07 is single bulb taillight and 06 is a two bulb taillight with separate brake and turn bulbs. Already calling for 05 loom might be good swap at my salvage yard to do a swap.
