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P0253 – Injection Pump Fuel Metering Control A Low (Cam/Rotor/Injector) (OBD2)

P0253 means "Injection Pump Fuel Metering Control A Low (Cam/Rotor/Injector)". The voltage the control unit measures in the diesel injection pump fuel metering circuit is below the permitted minimum. For a sensor this usually means the signal wire is shorted to ground or the reference voltage is missing; for an actuator, that its control wire is shorted to ground.

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P0253 quick summary

Fault codeP0253
MeaningInjection Pump Fuel Metering Control A Low (Cam/Rotor/Injector)
SystemPowertrain (Engine & Transmission)
VehiclesGeneric OBD2
SeverityHigh
Can I drive?Not recommended. Power may be reduced severely, the engine may stall, or it may not stop when the key is turned off (shutoff solenoid).
Repair cost€30 – €1,500

How diesel injection pump metering works

These codes relate to fuel metering, injection timing and the shutoff solenoid of diesel injection pumps – mainly older distributor pumps and pump-injector systems.

Older electronically controlled diesel pumps (for example distributor pumps on 1990s and early-2000s TDI and HDI engines) have an actuator that sets the fuel quantity, a timing device that sets injection timing, and a shutoff solenoid that stops the fuel supply when the engine is switched off.

The control unit monitors the actuator position and timing. Codes P0251–P0260 report metering control faults (A and B), P0216 an injection timing control fault and P0215 the engine shutoff solenoid. On modern common-rail engines similar functions are covered by fuel pressure and metering valve codes.

Causes include worn pump internals, sticking actuators, faulty position sensors inside the pump, wiring problems and contaminated fuel. Pump repairs are usually done by a diesel specialist.

On VAG vehicles (VW, Audi, Škoda, Seat, Cupra), VCDS and older VAG testers can show this code as the five-digit VAG code 16637 (P0253). Both numbers mean the same fault.

Symptoms of P0253

  • Loss of power, limp mode
  • Hard starting or no start
  • Engine does not switch off or switches off late
  • Black or white smoke
  • Check Engine or glow plug light

Most common causes of P0253 (most likely first)

Mechanic's Pro Tip

On older distributor pumps, many quantity adjuster faults come from worn internal wiring or a corroded connector rather than the mechanics – a specialist can often repair the pump electronics for a fraction of the price of a new pump.

  1. 1.Signal or control wire shorted to ground

    Most likely

    Look for chafed insulation where the harness touches the engine, exhaust brackets or body edges.

  2. 2.Missing 5 V reference or supply voltage

    An open reference wire or a shorted sensor elsewhere on the same reference circuit can pull it down.

  3. 3.Internal short in the diesel injection pump fuel metering

  4. 4.Sticking metering actuator or worn pump

    Wear and dirt affect the internal quantity control.

  5. 5.Faulty position sensor in the pump

    The control unit cannot see the actuator position.

  6. 6.Failed shutoff solenoid

    Engine does not start or does not stop.

  7. 7.Wiring or connector fault

    The pump connector is often oily and corroded.

Step-by-step diagnostic guide

  1. 1

    Read codes and live data

    Read all codes and compare commanded and actual fuel quantity and timing values in live data.

  2. 2

    Measure the signal voltage

    With the ignition on and the diesel injection pump fuel metering plugged in, back-probe the signal wire. Then unplug it and check the reference/supply and ground wires separately.

    Multimeter: Signal near 0 V = short to ground or no reference. Reference wire: about 5 V with ignition on. Signal wire to ground with connector unplugged: no continuity.

  3. 3

    Check the fuel supply

    Replace an old filter, bleed the system and look for air in the clear fuel lines.

  4. 4

    Check connector and wiring

    Inspect the pump connector for oil and corrosion and check the wiring to the control unit.

  5. 5

    Test the shutoff solenoid

    Listen for a click when switching the ignition on and check its supply voltage.

  6. 6

    Have the pump tested

    If the electrical side is good, have the pump tested and repaired by a diesel specialist.

Frequently asked questions

Can I keep driving with P0253?

Not recommended. Power may be reduced severely, the engine may stall, or it may not stop when the key is turned off (shutoff solenoid).

How much does it cost to fix P0253?

Typical repair costs are 30 € – 1500 €, depending on the cause and the vehicle. The most common fixes are: signal or control wire shorted to ground; missing 5 V reference or supply voltage; internal short in the diesel injection pump fuel metering. Always confirm the cause with the tests above before buying parts.

Do modern common-rail engines use these codes?

Rarely. These codes are mainly used on older electronically controlled distributor pumps; common-rail engines use fuel pressure and metering valve codes instead.

Can a diesel pump be repaired?

Yes. Diesel specialists can often rebuild injection pumps, which is usually cheaper than a new pump.

What is the difference between P0253 and similar codes?

P0253 belongs to a group of codes for the same component that differ in the type or location of the fault: P0216 – Injection Timing Control Circuit Malfunction; P0251 – Injection Pump Fuel Metering Control A Malfunction (Cam/Rotor/Injector); P0252 – Injection Pump Fuel Metering Control A Range/Performance (Cam/Rotor/Injector); P0254 – Injection Pump Fuel Metering Control A High (Cam/Rotor/Injector); P0255 – Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector); P0256 – Injection Pump Fuel Metering Control B Malfunction (Cam/Rotor/Injector). The tests on this page apply to the whole group; the type of fault tells you where to start.

Related fault codes

This guide is for information only. Working on vehicles can be dangerous — if you are unsure, have the car checked by a qualified mechanic. Values can differ between model years; always check the manufacturer's repair information.