Code
P0280
Generic
P — Powertrain
Cylinder 7 Injector A Circuit High
Views:
UK: 16
EN: 25
RU: 17
AI status
Completed
Completed
100%
Causes
- Short to battery/ignition voltage in the Cylinder 7 injector wiring
- Faulty Cylinder 7 injector (internal short/open or faulted coil)
- Poor or corroded connector or pin contact at the injector
- Open or high-resistance ground or supply circuit
- Faulty PCM/ECM driver or internal electronic failure
- Aftermarket wiring, recent repairs or connector damage (chafing, pin pushed out)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or misfire localized to cylinder 7
- Reduced engine power, hesitation or poor drivability
- Higher than normal fuel consumption
- Hard starting or extended crank
- Possible smoking from exhaust (diesel) or abnormal combustion behavior
What to check
- Read freeze-frame and live data; confirm P0280 and note conditions (temperature, rpm, load)
- Visual inspection of injector 7 connector, wiring harness, and nearby components for damage or corrosion
- Back-probe injector connector with key ON engine OFF to check supply and driver voltages
- Measure injector coil resistance (compare to spec) and check for short to battery or ground
- Wiggle test: monitor live data while gently moving harness and connectors to reproduce fault
- Swap injector 7 with another known-good cylinder (if serviceable) and see if code follows injector
Signal parameters
- Injector supply (reference) pin: ~battery voltage with key ON (typically 11–14 V depending on battery/ignition)
- Injector driver pin: expected behavior is a pulsed low-side to near 0 V when energized; inactive state often near battery voltage
- A "Circuit High" detection means the driver pin or circuit is measuring significantly higher than the expected low value (stuck near battery/IGN)
- Injector coil resistance varies by engine type — consult the service manual. (Typical coil resistances can range from
- Pulse width and frequency depend on engine load and RPM — compare waveforms to manufacturer reference
Diagnostic algorithm
- Verify the DTC and read freeze-frame/live data to confirm conditions when code set.
- Perform a careful visual inspection of injector 7 connector, wiring loom, and nearby harness (look for chafing, pin damage, melted insulation, corrosion).
- With key ON, engine OFF: back-probe the injector connector. Verify supply pin ~battery voltage. Verify driver pin voltage (should not be shorted to battery when inactive).
- Measure injector coil resistance at the connector (pin-to-pin) and compare to service spec. Also check for short to battery or ground.
- If resistance and static voltages are normal, crank engine and observe driver waveform with a scope or monitor live data. Check that driver pulses pull the driver pin near 0 V during injection.
- Wiggle the harness/connectors while monitoring: if fault is intermittent, movement may reproduce the DTC.
- Swap injector 7 with another cylinder’s injector (or install a known-good injector) and clear codes. If code follows the injector, replace the injector.
- If code does not follow the injector, test continuity and resistance from injector connector to PCM. Repair wiring, connectors, or grounds as required.
- If wiring, connectors, and injector test OK, suspect PCM/ECM driver failure and confirm with manufacturer-specific tests before replacing the PCM. Follow service manual precautions for PCM replacement.
- After repairs, clear codes and verify proper operation on-road and with live data; confirm DTC does not return.
Likely causes
- Damaged wiring harness or connector to injector 7 (most common)
- Injector 7 internal failure (stuck open or shorted to battery)
- Intermittent connector corrosion or poor pin contact
- PCM/ECM driver problem (less common, more likely after wiring and injector tests)
Fault status
Status
PCM detected an abnormally high voltage on the Cylinder 7 Injector A control circuit (voltage on the driver/signal circuit higher than expected). This indicates a possible short to battery/IGN, injector fault, wiring/connector problem, or PCM driver issue.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P0280
GWM
P — Powertrain
- High-performance chain injector 7 cylinder
Views:
UK: 1
EN: 4
RU: 0
AI status
Completed
Completed
100%
Causes
- Short to battery/ignition voltage in the Cylinder 7 injector wiring
- Faulty Cylinder 7 injector (internal short/open or faulted coil)
- Poor or corroded connector or pin contact at the injector
- Open or high-resistance ground or supply circuit
- Faulty PCM/ECM driver or internal electronic failure
- Aftermarket wiring, recent repairs or connector damage (chafing, pin pushed out)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or misfire localized to cylinder 7
- Reduced engine power, hesitation or poor drivability
- Higher than normal fuel consumption
- Hard starting or extended crank
- Possible smoking from exhaust (diesel) or abnormal combustion behavior
What to check
- Read freeze-frame and live data; confirm P0280 and note conditions (temperature, rpm, load)
- Visual inspection of injector 7 connector, wiring harness, and nearby components for damage or corrosion
- Back-probe injector connector with key ON engine OFF to check supply and driver voltages
- Measure injector coil resistance (compare to spec) and check for short to battery or ground
- Wiggle test: monitor live data while gently moving harness and connectors to reproduce fault
- Swap injector 7 with another known-good cylinder (if serviceable) and see if code follows injector
Signal parameters
- Injector supply (reference) pin: ~battery voltage with key ON (typically 11–14 V depending on battery/ignition)
- Injector driver pin: expected behavior is a pulsed low-side to near 0 V when energized; inactive state often near battery voltage
- A "Circuit High" detection means the driver pin or circuit is measuring significantly higher than the expected low value (stuck near battery/IGN)
- Injector coil resistance varies by engine type — consult the service manual. (Typical coil resistances can range from
- Pulse width and frequency depend on engine load and RPM — compare waveforms to manufacturer reference
Diagnostic algorithm
- Verify the DTC and read freeze-frame/live data to confirm conditions when code set.
- Perform a careful visual inspection of injector 7 connector, wiring loom, and nearby harness (look for chafing, pin damage, melted insulation, corrosion).
- With key ON, engine OFF: back-probe the injector connector. Verify supply pin ~battery voltage. Verify driver pin voltage (should not be shorted to battery when inactive).
- Measure injector coil resistance at the connector (pin-to-pin) and compare to service spec. Also check for short to battery or ground.
- If resistance and static voltages are normal, crank engine and observe driver waveform with a scope or monitor live data. Check that driver pulses pull the driver pin near 0 V during injection.
- Wiggle the harness/connectors while monitoring: if fault is intermittent, movement may reproduce the DTC.
- Swap injector 7 with another cylinder’s injector (or install a known-good injector) and clear codes. If code follows the injector, replace the injector.
- If code does not follow the injector, test continuity and resistance from injector connector to PCM. Repair wiring, connectors, or grounds as required.
- If wiring, connectors, and injector test OK, suspect PCM/ECM driver failure and confirm with manufacturer-specific tests before replacing the PCM. Follow service manual precautions for PCM replacement.
- After repairs, clear codes and verify proper operation on-road and with live data; confirm DTC does not return.
Likely causes
- Damaged wiring harness or connector to injector 7 (most common)
- Injector 7 internal failure (stuck open or shorted to battery)
- Intermittent connector corrosion or poor pin contact
- PCM/ECM driver problem (less common, more likely after wiring and injector tests)
Fault status
Status
PCM detected an abnormally high voltage on the Cylinder 7 Injector A control circuit (voltage on the driver/signal circuit higher than expected). This indicates a possible short to battery/IGN, injector fault, wiring/connector problem, or PCM driver issue.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P0280
HUMMER
P — Powertrain
Cylinder 7 Injector Circuit High
Views:
UK: 4
EN: 9
RU: 5
AI status
Completed
Completed
100%
Causes
- Short to battery/ignition voltage in the Cylinder 7 injector wiring
- Faulty Cylinder 7 injector (internal short/open or faulted coil)
- Poor or corroded connector or pin contact at the injector
- Open or high-resistance ground or supply circuit
- Faulty PCM/ECM driver or internal electronic failure
- Aftermarket wiring, recent repairs or connector damage (chafing, pin pushed out)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or misfire localized to cylinder 7
- Reduced engine power, hesitation or poor drivability
- Higher than normal fuel consumption
- Hard starting or extended crank
- Possible smoking from exhaust (diesel) or abnormal combustion behavior
What to check
- Read freeze-frame and live data; confirm P0280 and note conditions (temperature, rpm, load)
- Visual inspection of injector 7 connector, wiring harness, and nearby components for damage or corrosion
- Back-probe injector connector with key ON engine OFF to check supply and driver voltages
- Measure injector coil resistance (compare to spec) and check for short to battery or ground
- Wiggle test: monitor live data while gently moving harness and connectors to reproduce fault
- Swap injector 7 with another known-good cylinder (if serviceable) and see if code follows injector
Signal parameters
- Injector supply (reference) pin: ~battery voltage with key ON (typically 11–14 V depending on battery/ignition)
- Injector driver pin: expected behavior is a pulsed low-side to near 0 V when energized; inactive state often near battery voltage
- A "Circuit High" detection means the driver pin or circuit is measuring significantly higher than the expected low value (stuck near battery/IGN)
- Injector coil resistance varies by engine type — consult the service manual. (Typical coil resistances can range from
- Pulse width and frequency depend on engine load and RPM — compare waveforms to manufacturer reference
Diagnostic algorithm
- Verify the DTC and read freeze-frame/live data to confirm conditions when code set.
- Perform a careful visual inspection of injector 7 connector, wiring loom, and nearby harness (look for chafing, pin damage, melted insulation, corrosion).
- With key ON, engine OFF: back-probe the injector connector. Verify supply pin ~battery voltage. Verify driver pin voltage (should not be shorted to battery when inactive).
- Measure injector coil resistance at the connector (pin-to-pin) and compare to service spec. Also check for short to battery or ground.
- If resistance and static voltages are normal, crank engine and observe driver waveform with a scope or monitor live data. Check that driver pulses pull the driver pin near 0 V during injection.
- Wiggle the harness/connectors while monitoring: if fault is intermittent, movement may reproduce the DTC.
- Swap injector 7 with another cylinder’s injector (or install a known-good injector) and clear codes. If code follows the injector, replace the injector.
- If code does not follow the injector, test continuity and resistance from injector connector to PCM. Repair wiring, connectors, or grounds as required.
- If wiring, connectors, and injector test OK, suspect PCM/ECM driver failure and confirm with manufacturer-specific tests before replacing the PCM. Follow service manual precautions for PCM replacement.
- After repairs, clear codes and verify proper operation on-road and with live data; confirm DTC does not return.
Likely causes
- Damaged wiring harness or connector to injector 7 (most common)
- Injector 7 internal failure (stuck open or shorted to battery)
- Intermittent connector corrosion or poor pin contact
- PCM/ECM driver problem (less common, more likely after wiring and injector tests)
Fault status
Status
PCM detected an abnormally high voltage on the Cylinder 7 Injector A control circuit (voltage on the driver/signal circuit higher than expected). This indicates a possible short to battery/IGN, injector fault, wiring/connector problem, or PCM driver issue.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
P0280
LAND ROVER
P — Powertrain
Cylinder 7 injector circuit Contribution of counterweight cylinder 7
Views:
UK: 2
EN: 8
RU: 4
AI status
Completed
Completed
100%
Causes
- Short to battery/ignition voltage in the Cylinder 7 injector wiring
- Faulty Cylinder 7 injector (internal short/open or faulted coil)
- Poor or corroded connector or pin contact at the injector
- Open or high-resistance ground or supply circuit
- Faulty PCM/ECM driver or internal electronic failure
- Aftermarket wiring, recent repairs or connector damage (chafing, pin pushed out)
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Rough idle or misfire localized to cylinder 7
- Reduced engine power, hesitation or poor drivability
- Higher than normal fuel consumption
- Hard starting or extended crank
- Possible smoking from exhaust (diesel) or abnormal combustion behavior
What to check
- Read freeze-frame and live data; confirm P0280 and note conditions (temperature, rpm, load)
- Visual inspection of injector 7 connector, wiring harness, and nearby components for damage or corrosion
- Back-probe injector connector with key ON engine OFF to check supply and driver voltages
- Measure injector coil resistance (compare to spec) and check for short to battery or ground
- Wiggle test: monitor live data while gently moving harness and connectors to reproduce fault
- Swap injector 7 with another known-good cylinder (if serviceable) and see if code follows injector
Signal parameters
- Injector supply (reference) pin: ~battery voltage with key ON (typically 11–14 V depending on battery/ignition)
- Injector driver pin: expected behavior is a pulsed low-side to near 0 V when energized; inactive state often near battery voltage
- A "Circuit High" detection means the driver pin or circuit is measuring significantly higher than the expected low value (stuck near battery/IGN)
- Injector coil resistance varies by engine type — consult the service manual. (Typical coil resistances can range from
- Pulse width and frequency depend on engine load and RPM — compare waveforms to manufacturer reference
Diagnostic algorithm
- Verify the DTC and read freeze-frame/live data to confirm conditions when code set.
- Perform a careful visual inspection of injector 7 connector, wiring loom, and nearby harness (look for chafing, pin damage, melted insulation, corrosion).
- With key ON, engine OFF: back-probe the injector connector. Verify supply pin ~battery voltage. Verify driver pin voltage (should not be shorted to battery when inactive).
- Measure injector coil resistance at the connector (pin-to-pin) and compare to service spec. Also check for short to battery or ground.
- If resistance and static voltages are normal, crank engine and observe driver waveform with a scope or monitor live data. Check that driver pulses pull the driver pin near 0 V during injection.
- Wiggle the harness/connectors while monitoring: if fault is intermittent, movement may reproduce the DTC.
- Swap injector 7 with another cylinder’s injector (or install a known-good injector) and clear codes. If code follows the injector, replace the injector.
- If code does not follow the injector, test continuity and resistance from injector connector to PCM. Repair wiring, connectors, or grounds as required.
- If wiring, connectors, and injector test OK, suspect PCM/ECM driver failure and confirm with manufacturer-specific tests before replacing the PCM. Follow service manual precautions for PCM replacement.
- After repairs, clear codes and verify proper operation on-road and with live data; confirm DTC does not return.
Likely causes
- Damaged wiring harness or connector to injector 7 (most common)
- Injector 7 internal failure (stuck open or shorted to battery)
- Intermittent connector corrosion or poor pin contact
- PCM/ECM driver problem (less common, more likely after wiring and injector tests)
Fault status
Status
PCM detected an abnormally high voltage on the Cylinder 7 Injector A control circuit (voltage on the driver/signal circuit higher than expected). This indicates a possible short to battery/IGN, injector fault, wiring/connector problem, or PCM driver issue.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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