P0259 Injection Pump Fuel Metering Control B Low

OBD2 Code: P0259

Description: Injection Pump Fuel Metering Control “B” Low

Definition: This code indicates that the fuel injection pump is not delivering the correct amount of fuel to the engine. The control circuit for the fuel metering is reading a lower than expected voltage, which suggests an issue with the wiring, connectors, or the injection pump itself.

p0259 – Injection Pump Fuel Metering Control B Low

Typical Severity: Moderate

Common Causes

P0259 – Injection Pump Fuel Metering Control B Low

Common causes:

• Faulty fuel injector
• Clogged fuel filter
• Fuel pressure regulator malfunction
• Wiring issues in the fuel injector circuit
• ECU (Engine Control Unit) failure

 

Common Misdiagnosis

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OBD2 Code: P0259

Description: Injection Pump Fuel Metering Control ‘B’ Low

Common Misdiagnosis: Replacing the fuel injection pump without checking for issues in the wiring or connectors related to the fuel metering control circuit.

 

Common Diagnostic Steps

OBD2 Code: P0259

Description: Injection Pump Fuel Metering Control ‘B’ Low

• Check for any additional trouble codes that may be present and address them first.
• Inspect the fuel system for leaks or blockages, including fuel lines, filters, and injectors.
• Test the fuel pressure to ensure it is within the manufacturer’s specifications.
• Examine the wiring and connectors related to the injection pump for signs of damage or corrosion.
• Use a multimeter to test the voltage and ground signals at the injection pump control module.
• Verify that the injection pump itself is functioning correctly by performing a bench test if necessary.
• If equipped, check the operation of any associated sensors such as camshaft or crankshaft position sensors.
• Consult service manual for specific vehicle diagnostic procedures related to this code.