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Home / DTC / P0257 — Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector)

P0257 — Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector)

Detailed page for trouble code P0257.

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Code

P0257

Generic P — Powertrain

Injection Pump Fuel Metering Control B Range/Performance (Cam/Rotor/Injector)

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty injection pump metering control solenoid/actuator (Control B)
  • Open, shorted, corroded or disconnected wiring/connector to the pump control
  • Poor ground or low battery/charging system voltage
  • Internal mechanical fault in the injection pump (cam, rotor, metering sleeve)
  • Contaminated fuel, blocked fuel filter, or weak fuel feed/return
  • Faulty engine control module (ECM) or incorrect ECM command/signal

Symptoms

  • Engine runs poorly, reduced power or limp-home mode
  • Hard starting or extended cranking
  • Rough idle, misfire or stumbling under load
  • Reduced fuel economy
  • Excessive smoke (diesel) or abnormal exhaust
  • DTC P0257 stored; possibly other related codes

What to check

  • Read and record all stored DTCs and freeze-frame data with a scan tool
  • Confirm battery voltage is within normal range (with engine off and cranking)
  • Visually inspect wiring and connectors to the injection pump for damage, corrosion, or water intrusion
  • Check fuel level, fuel filter condition and fuel supply pump operation
  • Listen/observe for actuator movement when commanding via a scan tool (if supported)
  • Compare live data for control B (position/duty, commanded vs actual) using a capable scan tool

Signal parameters

  • Control command: typically a PWM or variable voltage command from the ECM (duty cycle or voltage varies with requested fuel delivery)
  • Expected response: actuator/position feedback should change proportionally to command (commanded vs actual closely correlated)
  • Supply voltage: near battery voltage when key on/crank (approximately 11–14 V) at the pump power feed
  • Connector/coil resistance: varies by manufacturer—consult service data; an open or shorted coil indicates failure
  • Current draw: should be within manufacturer specification; excessive or no current indicates a fault

Diagnostic algorithm

  1. Confirm code and freeze-frame: Use a scan tool to record DTC P0257 and any related codes (P0256, injector circuit codes, fuel pressure codes). Clear codes and attempt to re-create.
  2. Battery and supply check: Verify battery voltage and charging system integrity. Low voltage can cause erroneous range/performance faults.
  3. Visual inspection: Inspect wiring harness and connector to the pump for corrosion, broken wires, damaged insulation, water intrusion or loose pins. Repair as needed.
  4. Connector/backprobe: With connector exposed, backprobe power and ground pins. Verify constant power and good ground at the pump when key on and during cranking. Wiggle harness to check for intermittent faults.
  5. Command and observe: Using a scan tool, command the pump control B if tool supports it and observe actuator/position feedback or fuel delivery change. If no response, suspect actuator, wiring, or ECM output.
  6. Measure actuator resistance and apply bench/controlled power: With ignition off, measure actuator/solenoid resistance. If within service spec, carefully apply proper voltage (or use manufacturer-recommended test) to verify actuator movement. Do not apply uncontrolled voltage.
  7. Oscilloscope check: If available, scope the control signal at the pump connector while commanding control B. Look for expected PWM waveform, duty-range, and stable signal. Note any noise or open/short signatures.
  8. Fuel system check: Verify fuel supply pressure and flow, inspect/replace fuel filter(s), and check for air ingress or contaminated fuel that may limit pump operation.
  9. Isolate ECM vs pump: If wiring and power/ground are good but actuator does not respond, check ECM output driver circuit. Swap known-good ECM only if supported by proper procedures; consider substitute harness or bench test pump to isolate fault.
  10. Mechanical assessment: If electrical function is confirmed but performance is out of range, suspect internal pump mechanical wear or damage. Remove and bench-test or replace pump per manufacturer procedure.
  11. Repair and verify: Repair wiring or replace failed components, clear codes, then road test and verify code does not return and that commanded vs actual behavior is normal.

Likely causes

  • Wiring or connector issue to the pump control B circuit (most common)
  • Failed pump control solenoid/actuator
  • Low fuel pressure or clogged filter limiting pump operation
  • ECM output driver fault (less common)
  • Internal pump mechanical wear or seizure (requires bench repair)

Fault status

⚠️ Status
Control B for the injection pump fuel metering system is outside expected range or not performing as commanded. This indicates an electrical or mechanical failure in the pump control circuit, the actuator itself, fuel supply limitations, or an ECM output fault. Further diagnosis required.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours

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P0256 P0258 P0200 P0201 P0261
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Code

P0257

GWM P — Powertrain

- Incorrect indicator / fuel sensor B of the injector pump (cam / rotor / nozzle) not adjusted

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty injection pump metering control solenoid/actuator (Control B)
  • Open, shorted, corroded or disconnected wiring/connector to the pump control
  • Poor ground or low battery/charging system voltage
  • Internal mechanical fault in the injection pump (cam, rotor, metering sleeve)
  • Contaminated fuel, blocked fuel filter, or weak fuel feed/return
  • Faulty engine control module (ECM) or incorrect ECM command/signal

Symptoms

  • Engine runs poorly, reduced power or limp-home mode
  • Hard starting or extended cranking
  • Rough idle, misfire or stumbling under load
  • Reduced fuel economy
  • Excessive smoke (diesel) or abnormal exhaust
  • DTC P0257 stored; possibly other related codes

What to check

  • Read and record all stored DTCs and freeze-frame data with a scan tool
  • Confirm battery voltage is within normal range (with engine off and cranking)
  • Visually inspect wiring and connectors to the injection pump for damage, corrosion, or water intrusion
  • Check fuel level, fuel filter condition and fuel supply pump operation
  • Listen/observe for actuator movement when commanding via a scan tool (if supported)
  • Compare live data for control B (position/duty, commanded vs actual) using a capable scan tool

Signal parameters

  • Control command: typically a PWM or variable voltage command from the ECM (duty cycle or voltage varies with requested fuel delivery)
  • Expected response: actuator/position feedback should change proportionally to command (commanded vs actual closely correlated)
  • Supply voltage: near battery voltage when key on/crank (approximately 11–14 V) at the pump power feed
  • Connector/coil resistance: varies by manufacturer—consult service data; an open or shorted coil indicates failure
  • Current draw: should be within manufacturer specification; excessive or no current indicates a fault

Diagnostic algorithm

  1. Confirm code and freeze-frame: Use a scan tool to record DTC P0257 and any related codes (P0256, injector circuit codes, fuel pressure codes). Clear codes and attempt to re-create.
  2. Battery and supply check: Verify battery voltage and charging system integrity. Low voltage can cause erroneous range/performance faults.
  3. Visual inspection: Inspect wiring harness and connector to the pump for corrosion, broken wires, damaged insulation, water intrusion or loose pins. Repair as needed.
  4. Connector/backprobe: With connector exposed, backprobe power and ground pins. Verify constant power and good ground at the pump when key on and during cranking. Wiggle harness to check for intermittent faults.
  5. Command and observe: Using a scan tool, command the pump control B if tool supports it and observe actuator/position feedback or fuel delivery change. If no response, suspect actuator, wiring, or ECM output.
  6. Measure actuator resistance and apply bench/controlled power: With ignition off, measure actuator/solenoid resistance. If within service spec, carefully apply proper voltage (or use manufacturer-recommended test) to verify actuator movement. Do not apply uncontrolled voltage.
  7. Oscilloscope check: If available, scope the control signal at the pump connector while commanding control B. Look for expected PWM waveform, duty-range, and stable signal. Note any noise or open/short signatures.
  8. Fuel system check: Verify fuel supply pressure and flow, inspect/replace fuel filter(s), and check for air ingress or contaminated fuel that may limit pump operation.
  9. Isolate ECM vs pump: If wiring and power/ground are good but actuator does not respond, check ECM output driver circuit. Swap known-good ECM only if supported by proper procedures; consider substitute harness or bench test pump to isolate fault.
  10. Mechanical assessment: If electrical function is confirmed but performance is out of range, suspect internal pump mechanical wear or damage. Remove and bench-test or replace pump per manufacturer procedure.
  11. Repair and verify: Repair wiring or replace failed components, clear codes, then road test and verify code does not return and that commanded vs actual behavior is normal.

Likely causes

  • Wiring or connector issue to the pump control B circuit (most common)
  • Failed pump control solenoid/actuator
  • Low fuel pressure or clogged filter limiting pump operation
  • ECM output driver fault (less common)
  • Internal pump mechanical wear or seizure (requires bench repair)

Fault status

⚠️ Status
Control B for the injection pump fuel metering system is outside expected range or not performing as commanded. This indicates an electrical or mechanical failure in the pump control circuit, the actuator itself, fuel supply limitations, or an ECM output fault. Further diagnosis required.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours

Similar codes

P0256 P0258 P0200 P0201 P0261
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P0257

HUMMER P — Powertrain

Injection Pump Fuel Metering Control "B" Range/Performance (Cam/Rotor/Injector)

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty injection pump metering control solenoid/actuator (Control B)
  • Open, shorted, corroded or disconnected wiring/connector to the pump control
  • Poor ground or low battery/charging system voltage
  • Internal mechanical fault in the injection pump (cam, rotor, metering sleeve)
  • Contaminated fuel, blocked fuel filter, or weak fuel feed/return
  • Faulty engine control module (ECM) or incorrect ECM command/signal

Symptoms

  • Engine runs poorly, reduced power or limp-home mode
  • Hard starting or extended cranking
  • Rough idle, misfire or stumbling under load
  • Reduced fuel economy
  • Excessive smoke (diesel) or abnormal exhaust
  • DTC P0257 stored; possibly other related codes

What to check

  • Read and record all stored DTCs and freeze-frame data with a scan tool
  • Confirm battery voltage is within normal range (with engine off and cranking)
  • Visually inspect wiring and connectors to the injection pump for damage, corrosion, or water intrusion
  • Check fuel level, fuel filter condition and fuel supply pump operation
  • Listen/observe for actuator movement when commanding via a scan tool (if supported)
  • Compare live data for control B (position/duty, commanded vs actual) using a capable scan tool

Signal parameters

  • Control command: typically a PWM or variable voltage command from the ECM (duty cycle or voltage varies with requested fuel delivery)
  • Expected response: actuator/position feedback should change proportionally to command (commanded vs actual closely correlated)
  • Supply voltage: near battery voltage when key on/crank (approximately 11–14 V) at the pump power feed
  • Connector/coil resistance: varies by manufacturer—consult service data; an open or shorted coil indicates failure
  • Current draw: should be within manufacturer specification; excessive or no current indicates a fault

Diagnostic algorithm

  1. Confirm code and freeze-frame: Use a scan tool to record DTC P0257 and any related codes (P0256, injector circuit codes, fuel pressure codes). Clear codes and attempt to re-create.
  2. Battery and supply check: Verify battery voltage and charging system integrity. Low voltage can cause erroneous range/performance faults.
  3. Visual inspection: Inspect wiring harness and connector to the pump for corrosion, broken wires, damaged insulation, water intrusion or loose pins. Repair as needed.
  4. Connector/backprobe: With connector exposed, backprobe power and ground pins. Verify constant power and good ground at the pump when key on and during cranking. Wiggle harness to check for intermittent faults.
  5. Command and observe: Using a scan tool, command the pump control B if tool supports it and observe actuator/position feedback or fuel delivery change. If no response, suspect actuator, wiring, or ECM output.
  6. Measure actuator resistance and apply bench/controlled power: With ignition off, measure actuator/solenoid resistance. If within service spec, carefully apply proper voltage (or use manufacturer-recommended test) to verify actuator movement. Do not apply uncontrolled voltage.
  7. Oscilloscope check: If available, scope the control signal at the pump connector while commanding control B. Look for expected PWM waveform, duty-range, and stable signal. Note any noise or open/short signatures.
  8. Fuel system check: Verify fuel supply pressure and flow, inspect/replace fuel filter(s), and check for air ingress or contaminated fuel that may limit pump operation.
  9. Isolate ECM vs pump: If wiring and power/ground are good but actuator does not respond, check ECM output driver circuit. Swap known-good ECM only if supported by proper procedures; consider substitute harness or bench test pump to isolate fault.
  10. Mechanical assessment: If electrical function is confirmed but performance is out of range, suspect internal pump mechanical wear or damage. Remove and bench-test or replace pump per manufacturer procedure.
  11. Repair and verify: Repair wiring or replace failed components, clear codes, then road test and verify code does not return and that commanded vs actual behavior is normal.

Likely causes

  • Wiring or connector issue to the pump control B circuit (most common)
  • Failed pump control solenoid/actuator
  • Low fuel pressure or clogged filter limiting pump operation
  • ECM output driver fault (less common)
  • Internal pump mechanical wear or seizure (requires bench repair)

Fault status

⚠️ Status
Control B for the injection pump fuel metering system is outside expected range or not performing as commanded. This indicates an electrical or mechanical failure in the pump control circuit, the actuator itself, fuel supply limitations, or an ECM output fault. Further diagnosis required.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours

Similar codes

P0256 P0258 P0200 P0201 P0261
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

P0257

LAND ROVER P — Powertrain

Fuel measurement control of injection pump B - range / performance

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty injection pump metering control solenoid/actuator (Control B)
  • Open, shorted, corroded or disconnected wiring/connector to the pump control
  • Poor ground or low battery/charging system voltage
  • Internal mechanical fault in the injection pump (cam, rotor, metering sleeve)
  • Contaminated fuel, blocked fuel filter, or weak fuel feed/return
  • Faulty engine control module (ECM) or incorrect ECM command/signal

Symptoms

  • Engine runs poorly, reduced power or limp-home mode
  • Hard starting or extended cranking
  • Rough idle, misfire or stumbling under load
  • Reduced fuel economy
  • Excessive smoke (diesel) or abnormal exhaust
  • DTC P0257 stored; possibly other related codes

What to check

  • Read and record all stored DTCs and freeze-frame data with a scan tool
  • Confirm battery voltage is within normal range (with engine off and cranking)
  • Visually inspect wiring and connectors to the injection pump for damage, corrosion, or water intrusion
  • Check fuel level, fuel filter condition and fuel supply pump operation
  • Listen/observe for actuator movement when commanding via a scan tool (if supported)
  • Compare live data for control B (position/duty, commanded vs actual) using a capable scan tool

Signal parameters

  • Control command: typically a PWM or variable voltage command from the ECM (duty cycle or voltage varies with requested fuel delivery)
  • Expected response: actuator/position feedback should change proportionally to command (commanded vs actual closely correlated)
  • Supply voltage: near battery voltage when key on/crank (approximately 11–14 V) at the pump power feed
  • Connector/coil resistance: varies by manufacturer—consult service data; an open or shorted coil indicates failure
  • Current draw: should be within manufacturer specification; excessive or no current indicates a fault

Diagnostic algorithm

  1. Confirm code and freeze-frame: Use a scan tool to record DTC P0257 and any related codes (P0256, injector circuit codes, fuel pressure codes). Clear codes and attempt to re-create.
  2. Battery and supply check: Verify battery voltage and charging system integrity. Low voltage can cause erroneous range/performance faults.
  3. Visual inspection: Inspect wiring harness and connector to the pump for corrosion, broken wires, damaged insulation, water intrusion or loose pins. Repair as needed.
  4. Connector/backprobe: With connector exposed, backprobe power and ground pins. Verify constant power and good ground at the pump when key on and during cranking. Wiggle harness to check for intermittent faults.
  5. Command and observe: Using a scan tool, command the pump control B if tool supports it and observe actuator/position feedback or fuel delivery change. If no response, suspect actuator, wiring, or ECM output.
  6. Measure actuator resistance and apply bench/controlled power: With ignition off, measure actuator/solenoid resistance. If within service spec, carefully apply proper voltage (or use manufacturer-recommended test) to verify actuator movement. Do not apply uncontrolled voltage.
  7. Oscilloscope check: If available, scope the control signal at the pump connector while commanding control B. Look for expected PWM waveform, duty-range, and stable signal. Note any noise or open/short signatures.
  8. Fuel system check: Verify fuel supply pressure and flow, inspect/replace fuel filter(s), and check for air ingress or contaminated fuel that may limit pump operation.
  9. Isolate ECM vs pump: If wiring and power/ground are good but actuator does not respond, check ECM output driver circuit. Swap known-good ECM only if supported by proper procedures; consider substitute harness or bench test pump to isolate fault.
  10. Mechanical assessment: If electrical function is confirmed but performance is out of range, suspect internal pump mechanical wear or damage. Remove and bench-test or replace pump per manufacturer procedure.
  11. Repair and verify: Repair wiring or replace failed components, clear codes, then road test and verify code does not return and that commanded vs actual behavior is normal.

Likely causes

  • Wiring or connector issue to the pump control B circuit (most common)
  • Failed pump control solenoid/actuator
  • Low fuel pressure or clogged filter limiting pump operation
  • ECM output driver fault (less common)
  • Internal pump mechanical wear or seizure (requires bench repair)

Fault status

⚠️ Status
Control B for the injection pump fuel metering system is outside expected range or not performing as commanded. This indicates an electrical or mechanical failure in the pump control circuit, the actuator itself, fuel supply limitations, or an ECM output fault. Further diagnosis required.
🔴 Repair difficulty: Hard
⏱️ Diagnostic time: 2-6 hours

Similar codes

P0256 P0258 P0200 P0201 P0261
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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