Bosch VP44 diesel pump EDC
Having problems with a diesel non-start fault, pump control fault or diesel pump EDC fault?
Freestorm tests and repairs Bosch VP44 diesel pump EDC control units, also known as PSG5 pump control units, fitted to many diesel cars and vans.
If your vehicle cranks but will not start, starts and cuts out, or diagnostics show diesel pump control fault codes, send us your vehicle details and we’ll help check the best repair option.
Testing and repair for common Bosch VP44 diesel pump electronic control unit faults
Support for common diesel pump EDC faults that can stop the engine from starting
A repair may save the cost of replacing the full diesel pump
Typical turnaround from receipt of the unit
We help with part numbers, booking, delivery and updates
The Bosch VP44 is a diesel injection pump used on many older diesel cars and vans. It has an electronic control unit fitted to the pump, often called the EDC, PSG5 or diesel pump control unit.
The mechanical side of the pump moves and delivers fuel. The EDC control unit helps control pump operation electronically.
When the EDC fails, the engine may not start, may cut out, or may store diesel pump control fault codes. In many cases, the issue is with the electronic control unit on the pump rather than the full mechanical pump.
A faulty VP44 diesel pump EDC can stop the engine from starting. The vehicle may crank normally, but the pump may not run correctly because the electronic control unit has failed.
In some cases, the fault may appear as an intermittent starting issue at first. Later, the vehicle may fail to start completely.
Diesel pump faults can also be confusing because similar symptoms can come from other issues, such as fuel supply problems, air in the fuel system, wiring faults, immobiliser issues, crank sensor faults, relay faults or battery voltage problems.
That is why it is better to check the fault properly before replacing the full diesel pump
Remanufacturing is a structured industrial process that returns used parts (cores) to reliable working condition through inspection, replacement of worn parts, rebuilding and testing.
Best when:
The original Bosch VP44 diesel pump EDC control unit can be tested and repaired.
Benefits:
Best when:
The pump is mechanically damaged, badly contaminated, heavily corroded, physically broken or not suitable for repair
Benefits:
In many cases, checking the original Bosch VP44 EDC unit is the best first step. If the unit is too damaged to repair, we’ll let you know.
Bosch VP44 EDC faults usually affect starting and pump control. The fault may be intermittent at first or may cause a complete non-start.
The engine cranks but will not start
The engine may start briefly and then stop again
The vehicle may start sometimes and fail to start at other times
The vehicle may cut out while running and then refuse to restart
Diagnostics may show pump control, fuel quantity, timing or communication-related faults
Diagnostic equipment may not communicate correctly with the diesel pump control unit
The engine management light may appear with diesel pump-related fault codes
Some vehicles may run badly, hesitate or lose power before the pump EDC fails completely
Pump-related fault codes may clear for a short time but return when the vehicle is started or driven.
Fault codes depend on the vehicle, engine and diagnostic tool. These are common examples only. They should not be used as a final diagnosis without testing.
Can appear with VP44 pump timing or pump control faults
Can point to fuel quantity control problems inside the diesel pump control system
May indicate a communication or control fault with the diesel pump control unit
May appear on some diagnostic tools as an injection timing or injection begin fault
Fault codes depend on the vehicle, engine and diagnostic tool. These are common examples only. They should not be used as a final diagnosis without testing.
Often linked to diesel pump timing or control faults
Can indicate a pump control module or pump timing issue
Commonly linked to VP44 pump EDC control unit problems
May point to pump control, wiring or internal EDC faults
May be linked to control module or communication issues, depending on the vehicle and tool used
Before sending the unit, please collect as much information as you can. This helps us check the fault faster and avoid delays.
This depends on the vehicle and the unit fitted. In many cases, repairing the original VP44 EDC control unit can make the refit simpler because the original unit stays with the vehicle. If a replacement pump or used pump is fitted instead, extra setup, coding or matching may be required depending on the vehicle.
We check the details, review the fault information, confirm the next steps and keep you updated.
Typical repair time: 5-10 working days from receipt of unit.
Typical turnaround is approximately 5-10 working days from receipt of the unit.
This can depend on the fault, testing time, repair work required, parts availability and courier times. We’ll update you if extra time is needed.
Fill in the booking form with your vehicle, pump part number and fault details
We confirm what to send and provide delivery instructions. Pack the unit securely and include your booking details
Your diesel pump unit is tested and repaired. If repair is not suitable, we’ll advise you
Your unit is returned with repair notes and warranty information
This service is for selected vehicles fitted with Bosch VP44 diesel pump EDC / PSG5 control units.
Audi A4 / A6 / A8 2.5 TDI V6
BMW E46 320d / E39 520d
Ford Fiesta / Focus / Mondeo / Transit
Nissan Almera / Patrol / Terrano
Volkswagen Passat 2.5 TDI V6
Skoda Superb 2.5 TDI V6
Vauxhall / Opel Astra / Combo / Corsa / Frontera / Meriva / Omega / Signum / Vectra / Zafira
Rover 25 / 45
Dodge Ram 2500 / 3500
Typical turnaround is approximately 5-10 working days from receipt of the unit, depending on the fault and repair requirements.
This service is for the Bosch VP44 diesel pump EDC / PSG5 electronic control unit. The mechanical side of the pump must be checked separately.
Yes. A common symptom is that the engine cranks but will not start.
We can often advise from the fault codes, symptoms, pump part number and photos, but final confirmation may require testing.
Warranty depends on the part type and repair carried out. We will confirm the applicable warranty before or after assessment.
Please send the vehicle make, model, year, engine size, registration/VIN if available, pump part number, fault codes and symptoms.
No. Non-start faults can also be caused by fuel supply, air in the system, wiring, immobiliser, relays, crank sensor, battery voltage or other engine management faults.
This depends on the vehicle. Repairing the original EDC unit can often make refitting simpler, but the vehicle should still be checked with diagnostics after installation.
Sometimes, but used pumps may have unknown wear, coding issues or the same EDC fault later. Testing the original unit is often the better first step.
If the mechanical pump is worn, contaminated or damaged, EDC repair alone may not solve the fault. The mechanical pump and fuel system should be checked separately.
Send us your vehicle details, pump part number, fault codes or symptoms and we’ll help check whether diesel pump EDC testing and repair is the right option.
