Code
P0260
Generic
P — Powertrain
Injection Pump Fuel Metering Control B Intermittent (Cam/Rotor/Injector)
AI status
Completed
Completed
100%
Causes
- Intermittent/open/shorted wiring or connector in the fuel metering control B circuit
- Corroded or loose connector at the injection pump, metering valve, cam/rotor sensor or injector
- Failed injection pump metering solenoid/valve or injector driver component
- Faulty cam/rotor position sensor providing erratic timing reference
- Faulty PCM/ECM driver or internal electronics
- Water intrusion, debris or mechanical wear in the pump/rotor assembly
Symptoms
- MIL/Check Engine Light illuminated (intermittent)
- Rough idle, misfire or intermittent surging under load
- Hard starting or extended cranking
- Reduced engine power or limp-home mode when fault is detected
- Increased smoke or poor fuel economy
- Fault appears intermittently and may clear temporarily
What to check
- Read and record DTC(s), freeze frame and freeze-frame conditions with a scan tool
- Visually inspect connectors and wiring for damage, corrosion, bent pins, water entry or loose terminals
- Perform wiggle test on harness/connectors while monitoring live data or DTCs
- Verify proper power supply and ground at the pump/metering valve and cam/rotor sensor
- Back-probe connector and monitor control and sensor signals with a multimeter or oscilloscope
- Measure resistance of metering solenoid/injector per manufacturer spec (refer to service manual)
Signal parameters
- Control signal: pulsed control from PCM — pulse width varies with load and RPM (typically milliseconds range)
- Cam/rotor sensor: digital square wave or sine 0–5 V (frequency increases with engine speed)
- Metering solenoid/injector coil resistance: manufacturer-specific (often single-digit to low double-digit ohms); consult service data
- Connector supply voltage: battery voltage present when ignition ON (verify with multimeter)
- Ground: near 0 Ω to chassis / good low-resistance ground (
Diagnostic algorithm
- Retrieve all stored codes and freeze frame data. Attempt to reproduce the fault and note operating conditions when it occurs.
- Perform visual inspection of wiring, connectors and the pump/injector area for damage, corrosion, or loose terminals.
- With ignition OFF, disconnect connector(s) and inspect pins. Repair or replace damaged connectors or terminals.
- Check for proper power and ground at the pump/metering valve and cam/rotor sensor with ignition ON. Record voltages.
- Measure resistance of the metering solenoid/injector coil and compare to manufacturer specification. If out of range, replace component.
- Back-probe the control and sensor circuits with an oscilloscope while cranking/running to observe signal integrity and look for intermittent dropouts or noise.
- Perform a wiggle test on the harness while monitoring live data or DTC set/clear behavior to locate intermittent wiring faults.
- If wiring and connectors check OK, bench-test or swap the pump metering solenoid/injector (or cam/rotor sensor) with a known-good unit when possible.
- If components and wiring are good, test PCM outputs for proper switching; if suspect, consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform a road/test routine to confirm the fault does not return. Re-scan for pending codes.
Likely causes
- Damaged or corroded connector at pump/injector metering valve (most common)
- Broken/chafed wire or intermittent circuit short to ground/voltage
- Failed metering solenoid or injector in the pump assembly
- Intermittent cam/rotor position sensor signal
- PCM driver fault (least common)
Fault status
Status
MIL ON — DTC P0260 stored as intermittent. Freeze frame and live data should be reviewed to identify operating conditions when the fault occurred. Intermittent faults may require extended driving or component monitoring to reproduce.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0260
GWM
P — Powertrain
- Fuel injector sensor failure A of the injector pump (Cam / Rotor / Injector)
AI status
Completed
Completed
100%
Causes
- Intermittent/open/shorted wiring or connector in the fuel metering control B circuit
- Corroded or loose connector at the injection pump, metering valve, cam/rotor sensor or injector
- Failed injection pump metering solenoid/valve or injector driver component
- Faulty cam/rotor position sensor providing erratic timing reference
- Faulty PCM/ECM driver or internal electronics
- Water intrusion, debris or mechanical wear in the pump/rotor assembly
Symptoms
- MIL/Check Engine Light illuminated (intermittent)
- Rough idle, misfire or intermittent surging under load
- Hard starting or extended cranking
- Reduced engine power or limp-home mode when fault is detected
- Increased smoke or poor fuel economy
- Fault appears intermittently and may clear temporarily
What to check
- Read and record DTC(s), freeze frame and freeze-frame conditions with a scan tool
- Visually inspect connectors and wiring for damage, corrosion, bent pins, water entry or loose terminals
- Perform wiggle test on harness/connectors while monitoring live data or DTCs
- Verify proper power supply and ground at the pump/metering valve and cam/rotor sensor
- Back-probe connector and monitor control and sensor signals with a multimeter or oscilloscope
- Measure resistance of metering solenoid/injector per manufacturer spec (refer to service manual)
Signal parameters
- Control signal: pulsed control from PCM — pulse width varies with load and RPM (typically milliseconds range)
- Cam/rotor sensor: digital square wave or sine 0–5 V (frequency increases with engine speed)
- Metering solenoid/injector coil resistance: manufacturer-specific (often single-digit to low double-digit ohms); consult service data
- Connector supply voltage: battery voltage present when ignition ON (verify with multimeter)
- Ground: near 0 Ω to chassis / good low-resistance ground (
Diagnostic algorithm
- Retrieve all stored codes and freeze frame data. Attempt to reproduce the fault and note operating conditions when it occurs.
- Perform visual inspection of wiring, connectors and the pump/injector area for damage, corrosion, or loose terminals.
- With ignition OFF, disconnect connector(s) and inspect pins. Repair or replace damaged connectors or terminals.
- Check for proper power and ground at the pump/metering valve and cam/rotor sensor with ignition ON. Record voltages.
- Measure resistance of the metering solenoid/injector coil and compare to manufacturer specification. If out of range, replace component.
- Back-probe the control and sensor circuits with an oscilloscope while cranking/running to observe signal integrity and look for intermittent dropouts or noise.
- Perform a wiggle test on the harness while monitoring live data or DTC set/clear behavior to locate intermittent wiring faults.
- If wiring and connectors check OK, bench-test or swap the pump metering solenoid/injector (or cam/rotor sensor) with a known-good unit when possible.
- If components and wiring are good, test PCM outputs for proper switching; if suspect, consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform a road/test routine to confirm the fault does not return. Re-scan for pending codes.
Likely causes
- Damaged or corroded connector at pump/injector metering valve (most common)
- Broken/chafed wire or intermittent circuit short to ground/voltage
- Failed metering solenoid or injector in the pump assembly
- Intermittent cam/rotor position sensor signal
- PCM driver fault (least common)
Fault status
Status
MIL ON — DTC P0260 stored as intermittent. Freeze frame and live data should be reviewed to identify operating conditions when the fault occurred. Intermittent faults may require extended driving or component monitoring to reproduce.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P0260
HUMMER
P — Powertrain
Injection Pump Fuel Metering Control "B" Intermittent (Cam/Rotor/Injector)
AI status
Completed
Completed
100%
Causes
- Intermittent/open/shorted wiring or connector in the fuel metering control B circuit
- Corroded or loose connector at the injection pump, metering valve, cam/rotor sensor or injector
- Failed injection pump metering solenoid/valve or injector driver component
- Faulty cam/rotor position sensor providing erratic timing reference
- Faulty PCM/ECM driver or internal electronics
- Water intrusion, debris or mechanical wear in the pump/rotor assembly
Symptoms
- MIL/Check Engine Light illuminated (intermittent)
- Rough idle, misfire or intermittent surging under load
- Hard starting or extended cranking
- Reduced engine power or limp-home mode when fault is detected
- Increased smoke or poor fuel economy
- Fault appears intermittently and may clear temporarily
What to check
- Read and record DTC(s), freeze frame and freeze-frame conditions with a scan tool
- Visually inspect connectors and wiring for damage, corrosion, bent pins, water entry or loose terminals
- Perform wiggle test on harness/connectors while monitoring live data or DTCs
- Verify proper power supply and ground at the pump/metering valve and cam/rotor sensor
- Back-probe connector and monitor control and sensor signals with a multimeter or oscilloscope
- Measure resistance of metering solenoid/injector per manufacturer spec (refer to service manual)
Signal parameters
- Control signal: pulsed control from PCM — pulse width varies with load and RPM (typically milliseconds range)
- Cam/rotor sensor: digital square wave or sine 0–5 V (frequency increases with engine speed)
- Metering solenoid/injector coil resistance: manufacturer-specific (often single-digit to low double-digit ohms); consult service data
- Connector supply voltage: battery voltage present when ignition ON (verify with multimeter)
- Ground: near 0 Ω to chassis / good low-resistance ground (
Diagnostic algorithm
- Retrieve all stored codes and freeze frame data. Attempt to reproduce the fault and note operating conditions when it occurs.
- Perform visual inspection of wiring, connectors and the pump/injector area for damage, corrosion, or loose terminals.
- With ignition OFF, disconnect connector(s) and inspect pins. Repair or replace damaged connectors or terminals.
- Check for proper power and ground at the pump/metering valve and cam/rotor sensor with ignition ON. Record voltages.
- Measure resistance of the metering solenoid/injector coil and compare to manufacturer specification. If out of range, replace component.
- Back-probe the control and sensor circuits with an oscilloscope while cranking/running to observe signal integrity and look for intermittent dropouts or noise.
- Perform a wiggle test on the harness while monitoring live data or DTC set/clear behavior to locate intermittent wiring faults.
- If wiring and connectors check OK, bench-test or swap the pump metering solenoid/injector (or cam/rotor sensor) with a known-good unit when possible.
- If components and wiring are good, test PCM outputs for proper switching; if suspect, consult manufacturer guidance before replacing PCM.
- After repairs, clear codes and perform a road/test routine to confirm the fault does not return. Re-scan for pending codes.
Likely causes
- Damaged or corroded connector at pump/injector metering valve (most common)
- Broken/chafed wire or intermittent circuit short to ground/voltage
- Failed metering solenoid or injector in the pump assembly
- Intermittent cam/rotor position sensor signal
- PCM driver fault (least common)
Fault status
Status
MIL ON — DTC P0260 stored as intermittent. Freeze frame and live data should be reviewed to identify operating conditions when the fault occurred. Intermittent faults may require extended driving or component monitoring to reproduce.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
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