Code
P0259
Generic
P — Powertrain
Injection Pump Fuel Metering Control B High (Cam/Rotor/Injector)
Views:
UK: 20
EN: 21
RU: 14
AI status
Completed
Completed
100%
Causes
- Short to B+ or high-voltage condition in the pump metering/control B circuit
- Open or high-resistance wiring or poor connector/terminal contact
- Faulty injection pump (cam/rotor/rotor head) actuator or internal control valve
- Contaminated or aerated fuel causing erratic metering
- Faulty fuel rail pressure or position sensors used for closed-loop control
- Faulty PCM or an intermittent ECU output stage
Symptoms
- Malfunction indicator lamp (MIL) on
- Rough idle, misfire or hard starting
- Loss of engine power, hesitation or poor throttle response
- Increased smoke (diesel) or abnormal exhaust
- Reduced fuel economy
- Intermittent stalling or no-start condition in severe cases
What to check
- Retrieve freeze frame and live data; note fuel rail pressure, commanded vs actual metering values, and related DTCs
- Visually inspect pump connector and wiring for damage, corrosion, or bent pins
- Check battery voltage and power/ground at the pump connector with ignition on
- Measure continuity and resistance of the metering/control B circuit from PCM to pump
- Use a lab scope to view the pump control signal (PWM/duty cycle) and compare commanded vs actual
- Check fuel supply: fuel filter, water in fuel, and fuel lift pump operation
Signal parameters
- Control circuit: PWM duty cycle (commanded by PCM) and actual response at pump
- Control circuit voltage level with key on/engine running and during commanded events
- Circuit resistance/continuity between PCM and pump control terminal, and to ground
- Fuel rail/inlet pressure and pressure change when metering is commanded
- Cam/rotor position sensor waveform and timing reference
- Injector pulse widths and synchronization (if available)
Diagnostic algorithm
- Read and record all stored DTCs and freeze frame data. Check for related codes (fuel pressure, injector circuits, PCM faults).
- Clear codes and perform a road/drive test to see if P0259 returns and to capture live data.
- Visually inspect the pump, harness, and connectors for damage, corrosion, loose pins, or evidence of fuel/water intrusion.
- With connector disconnected, check for proper battery voltage and solid ground at the pump power terminals. Repair any supply or ground issues.
- Backprobe the pump metering/control B terminal while commanding the circuit (or during operation). Verify PCM is commanding a PWM signal and measure voltage/duty cycle with a scope or multimeter.
- Check continuity/resistance of the control circuit from the PCM to the pump; repair any shorts or opens. Wiggle test harness for intermittent faults.
- Verify fuel supply and pressure: replace fuel filter if contaminated and check inlet pressure to pump. Address aeration/water contamination.
- Inspect cam/rotor or pump timing and related sensors; compare sensor waveforms to specification. Correct timing or replace faulty sensors.
- If electrical signals and fuel supply are good but fault persists, bench-test or replace the injection pump metering assembly (or solenoid/actuator). Some pumps require calibration or dealer-level programming after replacement.
- If pump replacement does not clear the issue, consider PCM diagnostics or replacement only after exhaustively confirming wiring and pump function. Recheck for codes after repairs.
Likely causes
- Damaged connector pins or corroded wiring at the pump control connector
- Failed pump metering solenoid/actuator (internal short or sticking valve)
- High-resistance ground or missing/weak battery supply to pump control
- Contaminated fuel or clogged filter causing abnormal pump load
- Failed cam/rotor position sensor or signal used by the fuel metering control
Fault status
Status
PCM detected a high/above-expected signal on Injection Pump Fuel Metering Control B circuit (cam/rotor/injector type). Possible electrical short, pump actuator fault, sensor issue, or fuel supply problem.
Repair difficulty: Hard
Diagnostic time: 2-4 hours
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Code
P0259
GWM
P — Powertrain
- Fuel injector high sensor A of the injector pump (Cam / Rotor / Injector)
Views:
UK: 3
EN: 6
RU: 1
AI status
Completed
Completed
100%
Causes
- Short to B+ or high-voltage condition in the pump metering/control B circuit
- Open or high-resistance wiring or poor connector/terminal contact
- Faulty injection pump (cam/rotor/rotor head) actuator or internal control valve
- Contaminated or aerated fuel causing erratic metering
- Faulty fuel rail pressure or position sensors used for closed-loop control
- Faulty PCM or an intermittent ECU output stage
Symptoms
- Malfunction indicator lamp (MIL) on
- Rough idle, misfire or hard starting
- Loss of engine power, hesitation or poor throttle response
- Increased smoke (diesel) or abnormal exhaust
- Reduced fuel economy
- Intermittent stalling or no-start condition in severe cases
What to check
- Retrieve freeze frame and live data; note fuel rail pressure, commanded vs actual metering values, and related DTCs
- Visually inspect pump connector and wiring for damage, corrosion, or bent pins
- Check battery voltage and power/ground at the pump connector with ignition on
- Measure continuity and resistance of the metering/control B circuit from PCM to pump
- Use a lab scope to view the pump control signal (PWM/duty cycle) and compare commanded vs actual
- Check fuel supply: fuel filter, water in fuel, and fuel lift pump operation
Signal parameters
- Control circuit: PWM duty cycle (commanded by PCM) and actual response at pump
- Control circuit voltage level with key on/engine running and during commanded events
- Circuit resistance/continuity between PCM and pump control terminal, and to ground
- Fuel rail/inlet pressure and pressure change when metering is commanded
- Cam/rotor position sensor waveform and timing reference
- Injector pulse widths and synchronization (if available)
Diagnostic algorithm
- Read and record all stored DTCs and freeze frame data. Check for related codes (fuel pressure, injector circuits, PCM faults).
- Clear codes and perform a road/drive test to see if P0259 returns and to capture live data.
- Visually inspect the pump, harness, and connectors for damage, corrosion, loose pins, or evidence of fuel/water intrusion.
- With connector disconnected, check for proper battery voltage and solid ground at the pump power terminals. Repair any supply or ground issues.
- Backprobe the pump metering/control B terminal while commanding the circuit (or during operation). Verify PCM is commanding a PWM signal and measure voltage/duty cycle with a scope or multimeter.
- Check continuity/resistance of the control circuit from the PCM to the pump; repair any shorts or opens. Wiggle test harness for intermittent faults.
- Verify fuel supply and pressure: replace fuel filter if contaminated and check inlet pressure to pump. Address aeration/water contamination.
- Inspect cam/rotor or pump timing and related sensors; compare sensor waveforms to specification. Correct timing or replace faulty sensors.
- If electrical signals and fuel supply are good but fault persists, bench-test or replace the injection pump metering assembly (or solenoid/actuator). Some pumps require calibration or dealer-level programming after replacement.
- If pump replacement does not clear the issue, consider PCM diagnostics or replacement only after exhaustively confirming wiring and pump function. Recheck for codes after repairs.
Likely causes
- Damaged connector pins or corroded wiring at the pump control connector
- Failed pump metering solenoid/actuator (internal short or sticking valve)
- High-resistance ground or missing/weak battery supply to pump control
- Contaminated fuel or clogged filter causing abnormal pump load
- Failed cam/rotor position sensor or signal used by the fuel metering control
Fault status
Status
PCM detected a high/above-expected signal on Injection Pump Fuel Metering Control B circuit (cam/rotor/injector type). Possible electrical short, pump actuator fault, sensor issue, or fuel supply problem.
Repair difficulty: Hard
Diagnostic time: 2-4 hours
Similar codes
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Code
P0259
HUMMER
P — Powertrain
Injection Pump Fuel Metering Control "B" High (Cam/Rotor/Injector)
Views:
UK: 7
EN: 8
RU: 4
AI status
Completed
Completed
100%
Causes
- Short to B+ or high-voltage condition in the pump metering/control B circuit
- Open or high-resistance wiring or poor connector/terminal contact
- Faulty injection pump (cam/rotor/rotor head) actuator or internal control valve
- Contaminated or aerated fuel causing erratic metering
- Faulty fuel rail pressure or position sensors used for closed-loop control
- Faulty PCM or an intermittent ECU output stage
Symptoms
- Malfunction indicator lamp (MIL) on
- Rough idle, misfire or hard starting
- Loss of engine power, hesitation or poor throttle response
- Increased smoke (diesel) or abnormal exhaust
- Reduced fuel economy
- Intermittent stalling or no-start condition in severe cases
What to check
- Retrieve freeze frame and live data; note fuel rail pressure, commanded vs actual metering values, and related DTCs
- Visually inspect pump connector and wiring for damage, corrosion, or bent pins
- Check battery voltage and power/ground at the pump connector with ignition on
- Measure continuity and resistance of the metering/control B circuit from PCM to pump
- Use a lab scope to view the pump control signal (PWM/duty cycle) and compare commanded vs actual
- Check fuel supply: fuel filter, water in fuel, and fuel lift pump operation
Signal parameters
- Control circuit: PWM duty cycle (commanded by PCM) and actual response at pump
- Control circuit voltage level with key on/engine running and during commanded events
- Circuit resistance/continuity between PCM and pump control terminal, and to ground
- Fuel rail/inlet pressure and pressure change when metering is commanded
- Cam/rotor position sensor waveform and timing reference
- Injector pulse widths and synchronization (if available)
Diagnostic algorithm
- Read and record all stored DTCs and freeze frame data. Check for related codes (fuel pressure, injector circuits, PCM faults).
- Clear codes and perform a road/drive test to see if P0259 returns and to capture live data.
- Visually inspect the pump, harness, and connectors for damage, corrosion, loose pins, or evidence of fuel/water intrusion.
- With connector disconnected, check for proper battery voltage and solid ground at the pump power terminals. Repair any supply or ground issues.
- Backprobe the pump metering/control B terminal while commanding the circuit (or during operation). Verify PCM is commanding a PWM signal and measure voltage/duty cycle with a scope or multimeter.
- Check continuity/resistance of the control circuit from the PCM to the pump; repair any shorts or opens. Wiggle test harness for intermittent faults.
- Verify fuel supply and pressure: replace fuel filter if contaminated and check inlet pressure to pump. Address aeration/water contamination.
- Inspect cam/rotor or pump timing and related sensors; compare sensor waveforms to specification. Correct timing or replace faulty sensors.
- If electrical signals and fuel supply are good but fault persists, bench-test or replace the injection pump metering assembly (or solenoid/actuator). Some pumps require calibration or dealer-level programming after replacement.
- If pump replacement does not clear the issue, consider PCM diagnostics or replacement only after exhaustively confirming wiring and pump function. Recheck for codes after repairs.
Likely causes
- Damaged connector pins or corroded wiring at the pump control connector
- Failed pump metering solenoid/actuator (internal short or sticking valve)
- High-resistance ground or missing/weak battery supply to pump control
- Contaminated fuel or clogged filter causing abnormal pump load
- Failed cam/rotor position sensor or signal used by the fuel metering control
Fault status
Status
PCM detected a high/above-expected signal on Injection Pump Fuel Metering Control B circuit (cam/rotor/injector type). Possible electrical short, pump actuator fault, sensor issue, or fuel supply problem.
Repair difficulty: Hard
Diagnostic time: 2-4 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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Send to email
Code
P0259
LAND ROVER
P — Powertrain
Fuel Injection Pump B Control Circuit High
Views:
UK: 6
EN: 9
RU: 3
AI status
Completed
Completed
100%
Causes
- Short to B+ or high-voltage condition in the pump metering/control B circuit
- Open or high-resistance wiring or poor connector/terminal contact
- Faulty injection pump (cam/rotor/rotor head) actuator or internal control valve
- Contaminated or aerated fuel causing erratic metering
- Faulty fuel rail pressure or position sensors used for closed-loop control
- Faulty PCM or an intermittent ECU output stage
Symptoms
- Malfunction indicator lamp (MIL) on
- Rough idle, misfire or hard starting
- Loss of engine power, hesitation or poor throttle response
- Increased smoke (diesel) or abnormal exhaust
- Reduced fuel economy
- Intermittent stalling or no-start condition in severe cases
What to check
- Retrieve freeze frame and live data; note fuel rail pressure, commanded vs actual metering values, and related DTCs
- Visually inspect pump connector and wiring for damage, corrosion, or bent pins
- Check battery voltage and power/ground at the pump connector with ignition on
- Measure continuity and resistance of the metering/control B circuit from PCM to pump
- Use a lab scope to view the pump control signal (PWM/duty cycle) and compare commanded vs actual
- Check fuel supply: fuel filter, water in fuel, and fuel lift pump operation
Signal parameters
- Control circuit: PWM duty cycle (commanded by PCM) and actual response at pump
- Control circuit voltage level with key on/engine running and during commanded events
- Circuit resistance/continuity between PCM and pump control terminal, and to ground
- Fuel rail/inlet pressure and pressure change when metering is commanded
- Cam/rotor position sensor waveform and timing reference
- Injector pulse widths and synchronization (if available)
Diagnostic algorithm
- Read and record all stored DTCs and freeze frame data. Check for related codes (fuel pressure, injector circuits, PCM faults).
- Clear codes and perform a road/drive test to see if P0259 returns and to capture live data.
- Visually inspect the pump, harness, and connectors for damage, corrosion, loose pins, or evidence of fuel/water intrusion.
- With connector disconnected, check for proper battery voltage and solid ground at the pump power terminals. Repair any supply or ground issues.
- Backprobe the pump metering/control B terminal while commanding the circuit (or during operation). Verify PCM is commanding a PWM signal and measure voltage/duty cycle with a scope or multimeter.
- Check continuity/resistance of the control circuit from the PCM to the pump; repair any shorts or opens. Wiggle test harness for intermittent faults.
- Verify fuel supply and pressure: replace fuel filter if contaminated and check inlet pressure to pump. Address aeration/water contamination.
- Inspect cam/rotor or pump timing and related sensors; compare sensor waveforms to specification. Correct timing or replace faulty sensors.
- If electrical signals and fuel supply are good but fault persists, bench-test or replace the injection pump metering assembly (or solenoid/actuator). Some pumps require calibration or dealer-level programming after replacement.
- If pump replacement does not clear the issue, consider PCM diagnostics or replacement only after exhaustively confirming wiring and pump function. Recheck for codes after repairs.
Likely causes
- Damaged connector pins or corroded wiring at the pump control connector
- Failed pump metering solenoid/actuator (internal short or sticking valve)
- High-resistance ground or missing/weak battery supply to pump control
- Contaminated fuel or clogged filter causing abnormal pump load
- Failed cam/rotor position sensor or signal used by the fuel metering control
Fault status
Status
PCM detected a high/above-expected signal on Injection Pump Fuel Metering Control B circuit (cam/rotor/injector type). Possible electrical short, pump actuator fault, sensor issue, or fuel supply problem.
Repair difficulty: Hard
Diagnostic time: 2-4 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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0
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