Code
P0264
Generic
P — Powertrain
Cylinder 2 Injector A Circuit Low
AI status
Completed
Completed
100%
Causes
- Open, short to ground, or short to battery in injector harness for cylinder 2
- Corroded, loose, or damaged injector connector
- Failed injector (coil short or open)
- Faulty ECM/engine control module driver for injector A
- Poor ground or battery voltage condition
- Intermittent wiring fault (chaffing, broken wire inside insulation)
Symptoms
- Engine misfire on cylinder 2 or rough idle
- Reduced power or hesitation under load
- Check Engine Light (MIL) illuminated
- Possible increased smoke or poor emissions (diesel) or fuel economy loss
- Hard start or no-start in severe cases
What to check
- Read freeze-frame and pending codes; verify P0264 is current and note related codes (e.g., misfire codes).
- Verify battery voltage is healthy (typically >12.0 V) before testing.
- Visual inspection of injector #2 connector and wiring for corrosion, bends, pin damage, or chafing.
- Measure injector coil resistance at injector pins (compare to vehicle spec).
- Check for key-ON power supply at injector connector (reference voltage) and good ground.
- Backprobe injector connector while cranking and/or running to observe driver signal or use a noid light/oscilloscope.
Signal parameters
- Connector reference voltage with key ON: near battery voltage (depends on system) — verify against vehicle spec.
- Injector coil resistance: consult vehicle service data; many solenoid injectors fall within a low-ohm range (example ranges vary widely).
- Driver operation: ECM usually supplies a switched ground or switched V+; expecting pulsed signal during cranking/running.
- When commanded, voltage at the injector should switch between supply and ground; an oscilloscope/noid light should show pulses (pulse width varies with engine load and RPM).
- Current draw: injector drivers may source/sink up to several amps during pulse; excessive current indicates short, very low/no current indicates open circuit.
Diagnostic algorithm
- Retrieve codes and freeze-frame data. Note any related misfire or communication codes.
- Confirm battery voltage and system voltage are within spec before testing electrical circuits.
- Perform a careful visual inspection of the injector harness and connector at cylinder 2 for corrosion, bent pins, or damage.
- With ignition OFF, disconnect injector #2 and measure injector coil resistance. Compare to manufacturer specification. Replace injector if out of spec.
- With connector disconnected and ignition ON (or per vehicle procedure), measure supply/reference voltage at the connector pin(s). It should match the expected reference (consult service data).
- Backprobe the injector connector while cranking or running. Use a noid light or oscilloscope to verify the ECM is commanding the injector (look for pulses).
- If driver signal is absent but supply/reference is present, inspect wiring between ECM and connector for continuity and shorts to ground/battery. Repair as needed.
- Perform a wiggle test of the harness while monitoring the scan tool to find intermittent faults.
- If possible and safe, swap injector #2 with another known-good injector. If the code moves with the injector, the injector is faulty. If the code stays on cylinder 2, the wiring or ECM is likely at fault.
- If wiring and injector check good but no driver pulse, test/replace ECM driver or repair ECM circuit per manufacturer procedures. Consult technical service bulletins.
- Clear codes and perform a road or engine test to confirm repair. Re-scan to ensure the code does not return.
Likely causes
- Corroded or loose connector at injector #2
- Open or shorted injector coil
- Damaged wiring between ECM and injector #2
- Bad ground or poor battery/IGN power to injector circuit
Fault status
Status
P0264 - Cylinder 2 Injector A Circuit Low (low voltage or short detected on injector A circuit for cylinder 2)
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
Repair manuals
Brands with available manuals
9,525
The library contains 9,525 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
P0264
GWM
P — Powertrain
- Cylinder 2 injector low
AI status
Completed
Completed
100%
Causes
- Open, short to ground, or short to battery in injector harness for cylinder 2
- Corroded, loose, or damaged injector connector
- Failed injector (coil short or open)
- Faulty ECM/engine control module driver for injector A
- Poor ground or battery voltage condition
- Intermittent wiring fault (chaffing, broken wire inside insulation)
Symptoms
- Engine misfire on cylinder 2 or rough idle
- Reduced power or hesitation under load
- Check Engine Light (MIL) illuminated
- Possible increased smoke or poor emissions (diesel) or fuel economy loss
- Hard start or no-start in severe cases
What to check
- Read freeze-frame and pending codes; verify P0264 is current and note related codes (e.g., misfire codes).
- Verify battery voltage is healthy (typically >12.0 V) before testing.
- Visual inspection of injector #2 connector and wiring for corrosion, bends, pin damage, or chafing.
- Measure injector coil resistance at injector pins (compare to vehicle spec).
- Check for key-ON power supply at injector connector (reference voltage) and good ground.
- Backprobe injector connector while cranking and/or running to observe driver signal or use a noid light/oscilloscope.
Signal parameters
- Connector reference voltage with key ON: near battery voltage (depends on system) — verify against vehicle spec.
- Injector coil resistance: consult vehicle service data; many solenoid injectors fall within a low-ohm range (example ranges vary widely).
- Driver operation: ECM usually supplies a switched ground or switched V+; expecting pulsed signal during cranking/running.
- When commanded, voltage at the injector should switch between supply and ground; an oscilloscope/noid light should show pulses (pulse width varies with engine load and RPM).
- Current draw: injector drivers may source/sink up to several amps during pulse; excessive current indicates short, very low/no current indicates open circuit.
Diagnostic algorithm
- Retrieve codes and freeze-frame data. Note any related misfire or communication codes.
- Confirm battery voltage and system voltage are within spec before testing electrical circuits.
- Perform a careful visual inspection of the injector harness and connector at cylinder 2 for corrosion, bent pins, or damage.
- With ignition OFF, disconnect injector #2 and measure injector coil resistance. Compare to manufacturer specification. Replace injector if out of spec.
- With connector disconnected and ignition ON (or per vehicle procedure), measure supply/reference voltage at the connector pin(s). It should match the expected reference (consult service data).
- Backprobe the injector connector while cranking or running. Use a noid light or oscilloscope to verify the ECM is commanding the injector (look for pulses).
- If driver signal is absent but supply/reference is present, inspect wiring between ECM and connector for continuity and shorts to ground/battery. Repair as needed.
- Perform a wiggle test of the harness while monitoring the scan tool to find intermittent faults.
- If possible and safe, swap injector #2 with another known-good injector. If the code moves with the injector, the injector is faulty. If the code stays on cylinder 2, the wiring or ECM is likely at fault.
- If wiring and injector check good but no driver pulse, test/replace ECM driver or repair ECM circuit per manufacturer procedures. Consult technical service bulletins.
- Clear codes and perform a road or engine test to confirm repair. Re-scan to ensure the code does not return.
Likely causes
- Corroded or loose connector at injector #2
- Open or shorted injector coil
- Damaged wiring between ECM and injector #2
- Bad ground or poor battery/IGN power to injector circuit
Fault status
Status
P0264 - Cylinder 2 Injector A Circuit Low (low voltage or short detected on injector A circuit for cylinder 2)
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 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
0
👎 Dislike
0
Send to email
Code
P0264
HUMMER
P — Powertrain
Cylinder 2 Injector Circuit Low
AI status
Completed
Completed
100%
Causes
- Open, short to ground, or short to battery in injector harness for cylinder 2
- Corroded, loose, or damaged injector connector
- Failed injector (coil short or open)
- Faulty ECM/engine control module driver for injector A
- Poor ground or battery voltage condition
- Intermittent wiring fault (chaffing, broken wire inside insulation)
Symptoms
- Engine misfire on cylinder 2 or rough idle
- Reduced power or hesitation under load
- Check Engine Light (MIL) illuminated
- Possible increased smoke or poor emissions (diesel) or fuel economy loss
- Hard start or no-start in severe cases
What to check
- Read freeze-frame and pending codes; verify P0264 is current and note related codes (e.g., misfire codes).
- Verify battery voltage is healthy (typically >12.0 V) before testing.
- Visual inspection of injector #2 connector and wiring for corrosion, bends, pin damage, or chafing.
- Measure injector coil resistance at injector pins (compare to vehicle spec).
- Check for key-ON power supply at injector connector (reference voltage) and good ground.
- Backprobe injector connector while cranking and/or running to observe driver signal or use a noid light/oscilloscope.
Signal parameters
- Connector reference voltage with key ON: near battery voltage (depends on system) — verify against vehicle spec.
- Injector coil resistance: consult vehicle service data; many solenoid injectors fall within a low-ohm range (example ranges vary widely).
- Driver operation: ECM usually supplies a switched ground or switched V+; expecting pulsed signal during cranking/running.
- When commanded, voltage at the injector should switch between supply and ground; an oscilloscope/noid light should show pulses (pulse width varies with engine load and RPM).
- Current draw: injector drivers may source/sink up to several amps during pulse; excessive current indicates short, very low/no current indicates open circuit.
Diagnostic algorithm
- Retrieve codes and freeze-frame data. Note any related misfire or communication codes.
- Confirm battery voltage and system voltage are within spec before testing electrical circuits.
- Perform a careful visual inspection of the injector harness and connector at cylinder 2 for corrosion, bent pins, or damage.
- With ignition OFF, disconnect injector #2 and measure injector coil resistance. Compare to manufacturer specification. Replace injector if out of spec.
- With connector disconnected and ignition ON (or per vehicle procedure), measure supply/reference voltage at the connector pin(s). It should match the expected reference (consult service data).
- Backprobe the injector connector while cranking or running. Use a noid light or oscilloscope to verify the ECM is commanding the injector (look for pulses).
- If driver signal is absent but supply/reference is present, inspect wiring between ECM and connector for continuity and shorts to ground/battery. Repair as needed.
- Perform a wiggle test of the harness while monitoring the scan tool to find intermittent faults.
- If possible and safe, swap injector #2 with another known-good injector. If the code moves with the injector, the injector is faulty. If the code stays on cylinder 2, the wiring or ECM is likely at fault.
- If wiring and injector check good but no driver pulse, test/replace ECM driver or repair ECM circuit per manufacturer procedures. Consult technical service bulletins.
- Clear codes and perform a road or engine test to confirm repair. Re-scan to ensure the code does not return.
Likely causes
- Corroded or loose connector at injector #2
- Open or shorted injector coil
- Damaged wiring between ECM and injector #2
- Bad ground or poor battery/IGN power to injector circuit
Fault status
Status
P0264 - Cylinder 2 Injector A Circuit Low (low voltage or short detected on injector A circuit for cylinder 2)
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
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
-
HUMMER: 2009
-
HUMMER: 2008
-
HUMMER: 2007
-
HUMMER: 2005
-
HUMMER: 2004
-
HUMMER: 2000
-
HUMMER: 1999
-
HUMMER: 1994
-
HUMMER: 1993
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email