What dose this mean? P0628. Fuel pump?

 

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Are you experiencing any symptoms??? Or just getting the code.

you are a registered user, so you can use the search function and learn all bout what 0628 means. I am pretty sure it is a lift pump, and if you have the funds to upgrade your fuel system, then now is a good time to do it.

 

P0628-LOW VOLTAGE DETECTED AT THE
FUEL LIFT PUMP . . . . . . . . . . . . . . . . . . . .9-1433

² When Monitored:
While the key is on.

² Set Condition:
The commanded signal to the fuel lift pump circuit in the TIPM does not match the feedback signal from the
fuel lift pump circuit.

Possible Causes
WIRING HARNESS
TIPM
FUEL LIFT PUMP CONTROL CIRCUIT SHORTED TO EXTERNAL VOLTAGE
FUEL LIFT PUMP CONTROL CIRCUIT OPEN
FUEL LIFT PUMP GROUND CIRCUIT OPEN
FUEL LIFT PUMP GROUND CIRCUIT SHORTED TO EXTERNAL VOLTAGE
ECM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)

Diagnostic Test

1. POWER AT TPIM
Using a voltmeter, measure the voltage on the Battery Supply wire to the TIPM.
Turn the ignition on, engine off.
Does the voltmeter show battery voltage?

No >> Fix or replace the open circuit in the Battery Supply Circuit. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

Yes >> Go To 2

2. DAMANGED WIRING HARNESS
Turn Ignition off.
Disconnect the ECM and TIPM connectors. Inspect the connectors for signs of damage or corrosion.
NOTE: Check connectors - Clean/repair as necessary.
Are any pins damaged?

Yes >> Fix or replace the harness
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

No >> Go To 5

3. FUEL LIFT PUMP CONTROL CIRCUIT OPEN
Using an ohmmeter, measure the resistance of the lift pump control circuit between the ECM connector and the
TIPM connector.
Is the resistance less than 10 Ohms?

Yes >> Go To 4

No >> Repair the open ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)
9 - 1434 ENGINE - ELECTRICAL DIAGNOSTICS - DIESEL DR

4. FUEL LIFT PUMP CONTROL CIRCUIT SHORTED TO EXTERNAL VOLTAGE
Using a voltmeter, measure the voltage between battery negative and the lift pump control circuit at the TPIM connector.
Is the voltage greater than 1 volt?

No >> Go To 5

Yes >> Fix or replace the harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

5. FUEL LIFT PUMP CONTROL CIRCUIT SHORTED TO OTHER CIRCUITS
Using an ohmmeter, measure the resistance between the lift pump control circuit in the ECM connector and all other
circuits in the ECM connectors.
Is the resistance less than 10 Ohms?

Yes >> Fix or replace the harness.
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

No >> Go To 6

6. FUEL LIFT PUMP CONTROL CIRCUIT SHORTED TO EXTERNAL VOLTAGE
Connect the ECM and TIPM connectors.
Using a back probing tool 6801, back probe the lift pump control circuit in from TIPM connector.
Toggle the lift pump actuator with the Electronic Service Tool.
Using a 12 volt test light connected to battery negative, check the lift pump circuit at the TIPM connector.
NOTE: The test light must illuminate brightly.
Compare the brightness to that of a direct connection to the battery.
Does the test light cycle on and off and illuminate brightly?

No >> Replace the ECM
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

Yes >> Go To 7

7. FUEL LIFT PUMP DRIVER CIRCUIT SHORTED TO OTHER CIRCUITS
Using a back probing tool, back probe the lift pump control circuit in the TIPM connector.
Toggle the lift pump actuator with the scan Tool.
Using a 12 volt test light connected to battery negative, check the lift pump control circuit at the TIPM connector.
NOTE: The test light must illuminate brightly.
Compare the brightness to that of a direct connection to the battery.
Does the test light cycle on and off and illuminate brightly?

Yes >> Test complete.
Perform Intermittent Condition test. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

No >> Replace the TPIM
Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL). (Refer to 8 - ELECTRICAL/ELECTRONIC
CONTROL MODULES/ENGINE CONTROL MODULE - DIAGNOSIS AND TESTING)

That is out of the 06 factory service manual.

 

Thank y'all. It's a friend of mines truck. I will get my info put on here soon

 

Could just be a dead lift pump, and thats very likely.