big part of Thoroughbred Diesel gaining the reputation of
"Saving Diesel Lives" is due to our free advice
that we have given over the years on the VP44 injection pump
for the 98-02 Dodge Cummins. At Thoroughbred Diesel we are
a real diesel performance shop that understands the importance
of a truck down situation which is why we are happy to got
the extra mile and offer up free advice. The other reason
for free advice on VP44 questions is that we understand just
how intimidating it can be to shop for VP44 injection pumps.
Should I buy a remanufactured Bosch VP44 pump or spend a little
extra for the VP Plus VP44 and get an 18 month warranty? Do
I need a performance hot rod VP44? Should I buy a VP44 combo
package deal with a upgraded FASS or AirDog lift pump? We
are here to help, stop click and call us toll free at 866-737-4966
for free VP44 advice from a real diesel performance.
18 Month Warranty
Airdog & Fass
DTC Codes Associated with VP44 Diagnosis
(Fuel Injection Pump Timing Failure)- This code has often
been misunderstood as the VP44 “Code of Death”.
It does not automatically mean the VP is bad. Low lift pump
pressure and misaligned keyway can also set this code. If
customer has good fuel pressure and keyway alignment has
been confirmed, look to VP being bad.
and P0253 (Fuel Injection Pump Fuel Valve Failure)- The
fuel solenoid on the VP is bad. This is a internal failure
of the VP44.
(Crank Shaft Position Sensor Signal) - This code is associated
with the 1998.5 and 1999 Trucks because these were the only
years with Crank Position sensors. CKP sensor failures are
very common in these year trucks and can cause a no start,
hard start, or even an erratic idle. Verify crank signal
with hand held scanner before condemning the VP44
(Internal Fuel Pump Controller Failure)-This code usually
means bad PSG (Pump Computer) on the VP44 and can most of
the time be considered a VP failure.
(No Communication between ECM and Injection Pump Controller)-This
is usually a sign of PSG failure on the pump, but customer
also needs to check wiring between ECM and Pump controller
to make sure signal is reaching pump. See above wiring diagram
Also, faulty fuel pump relay can cause this code.
Please swap fuel pump relay with horn relay in fuse panel
and see if truck will run.
(Fuel Injection Pump does not agree with ECM CKP Sensor)-on
1998.5 and 1999 trucks suspect faulty Crank Position sensor.
If CKP signal is good, suspect faulty VP44.
(Fuel Injection Pump Controller Calibration Error)-Faulty
VP44. Pump computer is faulty which will require VP44 replacement.