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Home / DTC / P0283 — Cylinder 8 Injector A Circuit High

P0283 — Cylinder 8 Injector A Circuit High

Detailed page for trouble code P0283.

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22,612specific
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Code

P0283

Generic P — Powertrain

Cylinder 8 Injector A Circuit High

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

Causes

  • Short to battery (power) in injector 8 harness
  • Internal short or fault inside injector #8
  • Open or high-resistance wiring or connector to injector 8
  • Corroded or bent connector pins at injector or ECM
  • Faulty ECM/PCM injector driver transistor
  • Blown fuse or faulty relay affecting injector supply

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light ON
  • Rough idle or misfire on cylinder 8
  • Reduced engine power or hesitation under load
  • Hard starting or extended cranking
  • Poor fuel economy and higher emissions
  • Possible stalling or limp-home mode

What to check

  • Read DTCs and freeze-frame data; note conditions when code set
  • Perform visual inspection of injector 8 wiring, connector and pins for damage, corrosion, or melted insulation
  • Check fuses and relays related to fuel injectors and ECM power
  • Backprobe injector 8 connector with key ON and while cranking to measure voltages
  • Measure injector coil resistance at harness and compare to specification
  • Perform wiggle tests on harness while monitoring voltage or live data

Signal parameters

  • Supply/reference voltage at injector harness (key ON): approximately battery voltage (~12 V nominal)
  • Driver behavior: ECM typically switches/grounds the injector circuit; driver side will pulse toward 0 V when energized
  • Injector coil resistance: typical low-impedance injectors ~2–5 Ω; high-impedance injectors ~10–16 Ω (consult vehicle spec)
  • When shorted to battery, voltage on the driver/control pin will be higher than expected and may read close to battery voltage when it should be pulled low during pulses
  • Pulse current: injector pulses draw several amps depending on injector type and pulse width (measure with proper equipment)

Diagnostic algorithm

  1. Retrieve and record all trouble codes and freeze-frame data. Clear codes and attempt to re-run to reproduce the fault under same conditions.
  2. Visually inspect connector, wiring harness, and routing for heat damage, chafing, pin corrosion, or repairs near cylinder 8.
  3. With ignition ON (engine OFF) backprobe the injector connector: verify constant supply/reference voltage from the battery to the injector supply pin.
  4. Crank engine and measure the control/driver pin voltage. Expect pulsed grounding behavior; if the driver pin remains high (battery voltage) when it should be pulsed low, suspect a short to battery or bad driver.
  5. Measure injector coil resistance at the connector. Compare to manufacturer spec. Very low or near short indicates internal injector fault.
  6. Disconnect the injector and check circuit to see if code clears or changes. If code clears with injector unplugged, suspect injector or harness. If code persists, suspect wiring or ECM.
  7. Perform continuity checks between injector connector and ECM pins for shorts to battery, shorts to other circuits, and opens to the ECM. Repair any damaged wiring or connectors.
  8. If wiring and injector test OK, use an oscilloscope at the ECM driver to confirm proper waveform and switching. Abnormal waveform may indicate ECM driver failure.
  9. Replace the faulty injector if confirmed. After wiring and injector repairs, erase codes and test drive to confirm repair.
  10. Replace ECM/PCM only after all wiring and injector faults are ruled out and testing indicates a defective driver output.

Likely causes

  • Short to battery or power feed on the injector 8 harness
  • Failed or internally shorted injector at cylinder 8
  • Damaged connector or pin causing high voltage reading
  • ECM/PCM driver failure (less common, verify wiring first)

Fault status

⚠️ Status
Cylinder 8 Injector A Circuit High — the injector control circuit for cylinder 8 is reading higher than expected voltage. Possible short to battery, faulty injector, connector/wiring issue, or ECM driver fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
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Code

P0283

GWM P — Powertrain

- High 8-Cylinder Injector Circuit High

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

Causes

  • Short to battery (power) in injector 8 harness
  • Internal short or fault inside injector #8
  • Open or high-resistance wiring or connector to injector 8
  • Corroded or bent connector pins at injector or ECM
  • Faulty ECM/PCM injector driver transistor
  • Blown fuse or faulty relay affecting injector supply

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light ON
  • Rough idle or misfire on cylinder 8
  • Reduced engine power or hesitation under load
  • Hard starting or extended cranking
  • Poor fuel economy and higher emissions
  • Possible stalling or limp-home mode

What to check

  • Read DTCs and freeze-frame data; note conditions when code set
  • Perform visual inspection of injector 8 wiring, connector and pins for damage, corrosion, or melted insulation
  • Check fuses and relays related to fuel injectors and ECM power
  • Backprobe injector 8 connector with key ON and while cranking to measure voltages
  • Measure injector coil resistance at harness and compare to specification
  • Perform wiggle tests on harness while monitoring voltage or live data

Signal parameters

  • Supply/reference voltage at injector harness (key ON): approximately battery voltage (~12 V nominal)
  • Driver behavior: ECM typically switches/grounds the injector circuit; driver side will pulse toward 0 V when energized
  • Injector coil resistance: typical low-impedance injectors ~2–5 Ω; high-impedance injectors ~10–16 Ω (consult vehicle spec)
  • When shorted to battery, voltage on the driver/control pin will be higher than expected and may read close to battery voltage when it should be pulled low during pulses
  • Pulse current: injector pulses draw several amps depending on injector type and pulse width (measure with proper equipment)

Diagnostic algorithm

  1. Retrieve and record all trouble codes and freeze-frame data. Clear codes and attempt to re-run to reproduce the fault under same conditions.
  2. Visually inspect connector, wiring harness, and routing for heat damage, chafing, pin corrosion, or repairs near cylinder 8.
  3. With ignition ON (engine OFF) backprobe the injector connector: verify constant supply/reference voltage from the battery to the injector supply pin.
  4. Crank engine and measure the control/driver pin voltage. Expect pulsed grounding behavior; if the driver pin remains high (battery voltage) when it should be pulsed low, suspect a short to battery or bad driver.
  5. Measure injector coil resistance at the connector. Compare to manufacturer spec. Very low or near short indicates internal injector fault.
  6. Disconnect the injector and check circuit to see if code clears or changes. If code clears with injector unplugged, suspect injector or harness. If code persists, suspect wiring or ECM.
  7. Perform continuity checks between injector connector and ECM pins for shorts to battery, shorts to other circuits, and opens to the ECM. Repair any damaged wiring or connectors.
  8. If wiring and injector test OK, use an oscilloscope at the ECM driver to confirm proper waveform and switching. Abnormal waveform may indicate ECM driver failure.
  9. Replace the faulty injector if confirmed. After wiring and injector repairs, erase codes and test drive to confirm repair.
  10. Replace ECM/PCM only after all wiring and injector faults are ruled out and testing indicates a defective driver output.

Likely causes

  • Short to battery or power feed on the injector 8 harness
  • Failed or internally shorted injector at cylinder 8
  • Damaged connector or pin causing high voltage reading
  • ECM/PCM driver failure (less common, verify wiring first)

Fault status

⚠️ Status
Cylinder 8 Injector A Circuit High — the injector control circuit for cylinder 8 is reading higher than expected voltage. Possible short to battery, faulty injector, connector/wiring issue, or ECM driver fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
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Code

P0283

HUMMER P — Powertrain

Cylinder 8 Injector Circuit High

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

Causes

  • Short to battery (power) in injector 8 harness
  • Internal short or fault inside injector #8
  • Open or high-resistance wiring or connector to injector 8
  • Corroded or bent connector pins at injector or ECM
  • Faulty ECM/PCM injector driver transistor
  • Blown fuse or faulty relay affecting injector supply

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light ON
  • Rough idle or misfire on cylinder 8
  • Reduced engine power or hesitation under load
  • Hard starting or extended cranking
  • Poor fuel economy and higher emissions
  • Possible stalling or limp-home mode

What to check

  • Read DTCs and freeze-frame data; note conditions when code set
  • Perform visual inspection of injector 8 wiring, connector and pins for damage, corrosion, or melted insulation
  • Check fuses and relays related to fuel injectors and ECM power
  • Backprobe injector 8 connector with key ON and while cranking to measure voltages
  • Measure injector coil resistance at harness and compare to specification
  • Perform wiggle tests on harness while monitoring voltage or live data

Signal parameters

  • Supply/reference voltage at injector harness (key ON): approximately battery voltage (~12 V nominal)
  • Driver behavior: ECM typically switches/grounds the injector circuit; driver side will pulse toward 0 V when energized
  • Injector coil resistance: typical low-impedance injectors ~2–5 Ω; high-impedance injectors ~10–16 Ω (consult vehicle spec)
  • When shorted to battery, voltage on the driver/control pin will be higher than expected and may read close to battery voltage when it should be pulled low during pulses
  • Pulse current: injector pulses draw several amps depending on injector type and pulse width (measure with proper equipment)

Diagnostic algorithm

  1. Retrieve and record all trouble codes and freeze-frame data. Clear codes and attempt to re-run to reproduce the fault under same conditions.
  2. Visually inspect connector, wiring harness, and routing for heat damage, chafing, pin corrosion, or repairs near cylinder 8.
  3. With ignition ON (engine OFF) backprobe the injector connector: verify constant supply/reference voltage from the battery to the injector supply pin.
  4. Crank engine and measure the control/driver pin voltage. Expect pulsed grounding behavior; if the driver pin remains high (battery voltage) when it should be pulsed low, suspect a short to battery or bad driver.
  5. Measure injector coil resistance at the connector. Compare to manufacturer spec. Very low or near short indicates internal injector fault.
  6. Disconnect the injector and check circuit to see if code clears or changes. If code clears with injector unplugged, suspect injector or harness. If code persists, suspect wiring or ECM.
  7. Perform continuity checks between injector connector and ECM pins for shorts to battery, shorts to other circuits, and opens to the ECM. Repair any damaged wiring or connectors.
  8. If wiring and injector test OK, use an oscilloscope at the ECM driver to confirm proper waveform and switching. Abnormal waveform may indicate ECM driver failure.
  9. Replace the faulty injector if confirmed. After wiring and injector repairs, erase codes and test drive to confirm repair.
  10. Replace ECM/PCM only after all wiring and injector faults are ruled out and testing indicates a defective driver output.

Likely causes

  • Short to battery or power feed on the injector 8 harness
  • Failed or internally shorted injector at cylinder 8
  • Damaged connector or pin causing high voltage reading
  • ECM/PCM driver failure (less common, verify wiring first)

Fault status

⚠️ Status
Cylinder 8 Injector A Circuit High — the injector control circuit for cylinder 8 is reading higher than expected voltage. Possible short to battery, faulty injector, connector/wiring issue, or ECM driver fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
Repair manuals

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Code

P0283

LAND ROVER P — Powertrain

Cylinder 8 injector circuit high

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

Causes

  • Short to battery (power) in injector 8 harness
  • Internal short or fault inside injector #8
  • Open or high-resistance wiring or connector to injector 8
  • Corroded or bent connector pins at injector or ECM
  • Faulty ECM/PCM injector driver transistor
  • Blown fuse or faulty relay affecting injector supply

Symptoms

  • Malfunction Indicator Lamp (MIL) / Check Engine Light ON
  • Rough idle or misfire on cylinder 8
  • Reduced engine power or hesitation under load
  • Hard starting or extended cranking
  • Poor fuel economy and higher emissions
  • Possible stalling or limp-home mode

What to check

  • Read DTCs and freeze-frame data; note conditions when code set
  • Perform visual inspection of injector 8 wiring, connector and pins for damage, corrosion, or melted insulation
  • Check fuses and relays related to fuel injectors and ECM power
  • Backprobe injector 8 connector with key ON and while cranking to measure voltages
  • Measure injector coil resistance at harness and compare to specification
  • Perform wiggle tests on harness while monitoring voltage or live data

Signal parameters

  • Supply/reference voltage at injector harness (key ON): approximately battery voltage (~12 V nominal)
  • Driver behavior: ECM typically switches/grounds the injector circuit; driver side will pulse toward 0 V when energized
  • Injector coil resistance: typical low-impedance injectors ~2–5 Ω; high-impedance injectors ~10–16 Ω (consult vehicle spec)
  • When shorted to battery, voltage on the driver/control pin will be higher than expected and may read close to battery voltage when it should be pulled low during pulses
  • Pulse current: injector pulses draw several amps depending on injector type and pulse width (measure with proper equipment)

Diagnostic algorithm

  1. Retrieve and record all trouble codes and freeze-frame data. Clear codes and attempt to re-run to reproduce the fault under same conditions.
  2. Visually inspect connector, wiring harness, and routing for heat damage, chafing, pin corrosion, or repairs near cylinder 8.
  3. With ignition ON (engine OFF) backprobe the injector connector: verify constant supply/reference voltage from the battery to the injector supply pin.
  4. Crank engine and measure the control/driver pin voltage. Expect pulsed grounding behavior; if the driver pin remains high (battery voltage) when it should be pulsed low, suspect a short to battery or bad driver.
  5. Measure injector coil resistance at the connector. Compare to manufacturer spec. Very low or near short indicates internal injector fault.
  6. Disconnect the injector and check circuit to see if code clears or changes. If code clears with injector unplugged, suspect injector or harness. If code persists, suspect wiring or ECM.
  7. Perform continuity checks between injector connector and ECM pins for shorts to battery, shorts to other circuits, and opens to the ECM. Repair any damaged wiring or connectors.
  8. If wiring and injector test OK, use an oscilloscope at the ECM driver to confirm proper waveform and switching. Abnormal waveform may indicate ECM driver failure.
  9. Replace the faulty injector if confirmed. After wiring and injector repairs, erase codes and test drive to confirm repair.
  10. Replace ECM/PCM only after all wiring and injector faults are ruled out and testing indicates a defective driver output.

Likely causes

  • Short to battery or power feed on the injector 8 harness
  • Failed or internally shorted injector at cylinder 8
  • Damaged connector or pin causing high voltage reading
  • ECM/PCM driver failure (less common, verify wiring first)

Fault status

⚠️ Status
Cylinder 8 Injector A Circuit High — the injector control circuit for cylinder 8 is reading higher than expected voltage. Possible short to battery, faulty injector, connector/wiring issue, or ECM driver fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
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

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+100 karma for a short comment :)
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