P0627 help please!!!

Twin turbo boss 302 e85..... car was sitting fir around 2 months while I swapped a tr6060 in it. I finally get the car running and it throws p0627 code. It randomly starts misfiring.... then out if no where it turns into normal. And it keeps doing that... on and off. Already changed O2 sensors. Please any help would be great!


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About all i can suggest is check every wire connection from the PCM back. could be a loose connection or pinched wires from the transmission swap.
I went through A/F ratio sensors from a loose connection on a o2 sensor. Sounds crazy but once I unplugged and then plugged back in the o2 sensors the issue went away.

This is your code ????

sorry the image didn't post. P0627 is for the fuel pump control module.

Try this read instead....


P0627 - Fuel Pump A Control Circuit/Open

Description: The fuel pump control module monitors the fuel pump module and secondary circuits for a concern. If the fuel pump control module detects a concern with the fuel pump module or secondary circuits, the fuel pump control module sends an 80% duty cycle signal on the fuel pump monitor (FPM) circuit to report the concern to the PCM. The test fails when the fuel pump control module is still reporting a concern with the fuel pump module or secondary circuits after a calibrated amount of time.
Possible Causes:

• FPPWR circuit open
• FPPWR circuit short to ground
• FPRTN circuit open
• FPPWR circuit short to voltage
• FPRTN circuit short to voltage
• Damaged fuel pump assembly
• Damaged fuel pump control module

Diagnostic Aids: Check for any harness concerns. The fuel pump control module controls the speed of the fuel pump module by supplying a variable voltage to the fuel pump module on the FPPWR circuit.
Application Key On Engine Off Key On Engine Running Continuous Memory
All GO to Pinpoint Test KC.

Thanks for response guys, I figured it out. The guy that installed my transmission connected the o2 sensors wrong. He connect the RIGHT o2 on the LEFT o2 PLUG HARNESS! And same with the right. Just swapped the plugs over... and problem solved.


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