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Home / DTC / P0277 — Cylinder 6 Injector A Circuit High

P0277 — Cylinder 6 Injector A Circuit High

Detailed page for trouble code P0277.

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Code

P0277

Generic P — Powertrain

Cylinder 6 Injector A Circuit High

Brand: Generic
Type: P — Powertrain
Views: UK: 30 EN: 49 RU: 31
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in injector harness (cylinder 6)
  • Connector corrosion, bent pins, or poor terminal contact at injector
  • Short to battery voltage on the injector driver circuit
  • Failed fuel injector (internal electrical fault)
  • Faulty engine control module (injector driver)
  • Blown or intermittent injector supply fuse or failed relay

Symptoms

  • Malfunction indicator lamp (MIL) on
  • Rough idle or engine misfire at cylinder 6
  • Poor acceleration or reduced power
  • Reduced fuel economy
  • Hard starting or stumble on acceleration
  • Possible intermittent symptoms if wiring is intermittent

What to check

  • Read freeze frame and live data for injector pulse width and misfire counters
  • Inspect wiring harness and connector for cylinder 6 for damage, corrosion, or loose pins
  • Verify battery voltage at ignition on at the injector supply pin
  • Backprobe injector connector while cranking/running to observe driver behavior
  • Measure injector coil resistance (compare to spec or another cylinder)
  • Use a noid light or oscilloscope to confirm injector drive pulses

Signal parameters

  • Injector supply (reference) pin: battery voltage with key ON
  • Injector driver pin: should be near battery voltage when not commanded and pulse toward ground when commanded
  • Pulse width: varies with load and rpm (typically a few milliseconds at idle; increases under load)
  • Injector coil resistance: varies by injector type (low-impedance injectors ~2–4 ohms, high-impedance ~10–16 ohms); compare to vehicle spec or another cylinder
  • Current draw: injector pulse current typically peaks while energized; use manufacturer spec or measure with appropriate tools

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data. Confirm P0277 and note conditions (rpm, temp, voltage).
  2. Visually inspect cylinder 6 injector connector, wiring harness, and nearby components for damage, heat, abrasion, or corrosion.
  3. With ignition ON (engine OFF), verify battery voltage at the injector supply/reference terminal. If no supply, inspect fuses/relay and wiring to battery/ignition feed.
  4. Backprobe the injector driver terminal while cranking or running. Observe signal: driver should pull toward ground in pulses. If driver remains at battery voltage (high), there may be an open or short-to-battery; if driver is low when idle but not pulsing, ECM command or ground issue possible.
  5. Check injector coil resistance at the connector (unplugged). Compare to specification or another cylinder. Significant deviation indicates a faulty injector.
  6. Use a noid light or oscilloscope to confirm injector pulse presence and waveform quality. Look for irregular amplitude, absent pulses, or noisy waveform.
  7. Perform a wiggle test on wiring and connectors while observing live data or scope for changes. Repair any intermittent faults found.
  8. Swap the suspect injector with a known-good injector from another cylinder (if identical) and rerun to see if the fault follows the injector. If it follows, replace the injector.
  9. If wiring and injector check good but issue persists, inspect ECM grounds and harness continuity to the ECM. If suspect ECM driver failure, verify using manufacturer procedures before replacing ECM.
  10. After repairs, clear codes and perform a test drive under the same conditions that set the code to confirm repair.

Likely causes

  • Corroded/loose connector at cylinder 6 injector
  • Broken/shorted wire to injector (pinched or chafed)
  • Injector internal short (coil or solenoid failure)
  • Faulty injector driver transistor in ECM
  • Supply fuse or relay not providing stable voltage

Fault status

⚠️ Status
Cylinder 6 injector circuit voltage higher than expected (Injector A). Possible open circuit, short to battery, poor connection, failed injector, or ECM driver issue. MIL stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours
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Code

P0277

GWM P — Powertrain

- High-performance chain injector 6 cylinder

Brand: GWM
Type: P — Powertrain
Views: UK: 13 EN: 25 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in injector harness (cylinder 6)
  • Connector corrosion, bent pins, or poor terminal contact at injector
  • Short to battery voltage on the injector driver circuit
  • Failed fuel injector (internal electrical fault)
  • Faulty engine control module (injector driver)
  • Blown or intermittent injector supply fuse or failed relay

Symptoms

  • Malfunction indicator lamp (MIL) on
  • Rough idle or engine misfire at cylinder 6
  • Poor acceleration or reduced power
  • Reduced fuel economy
  • Hard starting or stumble on acceleration
  • Possible intermittent symptoms if wiring is intermittent

What to check

  • Read freeze frame and live data for injector pulse width and misfire counters
  • Inspect wiring harness and connector for cylinder 6 for damage, corrosion, or loose pins
  • Verify battery voltage at ignition on at the injector supply pin
  • Backprobe injector connector while cranking/running to observe driver behavior
  • Measure injector coil resistance (compare to spec or another cylinder)
  • Use a noid light or oscilloscope to confirm injector drive pulses

Signal parameters

  • Injector supply (reference) pin: battery voltage with key ON
  • Injector driver pin: should be near battery voltage when not commanded and pulse toward ground when commanded
  • Pulse width: varies with load and rpm (typically a few milliseconds at idle; increases under load)
  • Injector coil resistance: varies by injector type (low-impedance injectors ~2–4 ohms, high-impedance ~10–16 ohms); compare to vehicle spec or another cylinder
  • Current draw: injector pulse current typically peaks while energized; use manufacturer spec or measure with appropriate tools

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data. Confirm P0277 and note conditions (rpm, temp, voltage).
  2. Visually inspect cylinder 6 injector connector, wiring harness, and nearby components for damage, heat, abrasion, or corrosion.
  3. With ignition ON (engine OFF), verify battery voltage at the injector supply/reference terminal. If no supply, inspect fuses/relay and wiring to battery/ignition feed.
  4. Backprobe the injector driver terminal while cranking or running. Observe signal: driver should pull toward ground in pulses. If driver remains at battery voltage (high), there may be an open or short-to-battery; if driver is low when idle but not pulsing, ECM command or ground issue possible.
  5. Check injector coil resistance at the connector (unplugged). Compare to specification or another cylinder. Significant deviation indicates a faulty injector.
  6. Use a noid light or oscilloscope to confirm injector pulse presence and waveform quality. Look for irregular amplitude, absent pulses, or noisy waveform.
  7. Perform a wiggle test on wiring and connectors while observing live data or scope for changes. Repair any intermittent faults found.
  8. Swap the suspect injector with a known-good injector from another cylinder (if identical) and rerun to see if the fault follows the injector. If it follows, replace the injector.
  9. If wiring and injector check good but issue persists, inspect ECM grounds and harness continuity to the ECM. If suspect ECM driver failure, verify using manufacturer procedures before replacing ECM.
  10. After repairs, clear codes and perform a test drive under the same conditions that set the code to confirm repair.

Likely causes

  • Corroded/loose connector at cylinder 6 injector
  • Broken/shorted wire to injector (pinched or chafed)
  • Injector internal short (coil or solenoid failure)
  • Faulty injector driver transistor in ECM
  • Supply fuse or relay not providing stable voltage

Fault status

⚠️ Status
Cylinder 6 injector circuit voltage higher than expected (Injector A). Possible open circuit, short to battery, poor connection, failed injector, or ECM driver issue. MIL stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours
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Code

P0277

HUMMER P — Powertrain

Cylinder 6 Injector Circuit High

Brand: HUMMER
Type: P — Powertrain
Views: UK: 14 EN: 33 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in injector harness (cylinder 6)
  • Connector corrosion, bent pins, or poor terminal contact at injector
  • Short to battery voltage on the injector driver circuit
  • Failed fuel injector (internal electrical fault)
  • Faulty engine control module (injector driver)
  • Blown or intermittent injector supply fuse or failed relay

Symptoms

  • Malfunction indicator lamp (MIL) on
  • Rough idle or engine misfire at cylinder 6
  • Poor acceleration or reduced power
  • Reduced fuel economy
  • Hard starting or stumble on acceleration
  • Possible intermittent symptoms if wiring is intermittent

What to check

  • Read freeze frame and live data for injector pulse width and misfire counters
  • Inspect wiring harness and connector for cylinder 6 for damage, corrosion, or loose pins
  • Verify battery voltage at ignition on at the injector supply pin
  • Backprobe injector connector while cranking/running to observe driver behavior
  • Measure injector coil resistance (compare to spec or another cylinder)
  • Use a noid light or oscilloscope to confirm injector drive pulses

Signal parameters

  • Injector supply (reference) pin: battery voltage with key ON
  • Injector driver pin: should be near battery voltage when not commanded and pulse toward ground when commanded
  • Pulse width: varies with load and rpm (typically a few milliseconds at idle; increases under load)
  • Injector coil resistance: varies by injector type (low-impedance injectors ~2–4 ohms, high-impedance ~10–16 ohms); compare to vehicle spec or another cylinder
  • Current draw: injector pulse current typically peaks while energized; use manufacturer spec or measure with appropriate tools

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data. Confirm P0277 and note conditions (rpm, temp, voltage).
  2. Visually inspect cylinder 6 injector connector, wiring harness, and nearby components for damage, heat, abrasion, or corrosion.
  3. With ignition ON (engine OFF), verify battery voltage at the injector supply/reference terminal. If no supply, inspect fuses/relay and wiring to battery/ignition feed.
  4. Backprobe the injector driver terminal while cranking or running. Observe signal: driver should pull toward ground in pulses. If driver remains at battery voltage (high), there may be an open or short-to-battery; if driver is low when idle but not pulsing, ECM command or ground issue possible.
  5. Check injector coil resistance at the connector (unplugged). Compare to specification or another cylinder. Significant deviation indicates a faulty injector.
  6. Use a noid light or oscilloscope to confirm injector pulse presence and waveform quality. Look for irregular amplitude, absent pulses, or noisy waveform.
  7. Perform a wiggle test on wiring and connectors while observing live data or scope for changes. Repair any intermittent faults found.
  8. Swap the suspect injector with a known-good injector from another cylinder (if identical) and rerun to see if the fault follows the injector. If it follows, replace the injector.
  9. If wiring and injector check good but issue persists, inspect ECM grounds and harness continuity to the ECM. If suspect ECM driver failure, verify using manufacturer procedures before replacing ECM.
  10. After repairs, clear codes and perform a test drive under the same conditions that set the code to confirm repair.

Likely causes

  • Corroded/loose connector at cylinder 6 injector
  • Broken/shorted wire to injector (pinched or chafed)
  • Injector internal short (coil or solenoid failure)
  • Faulty injector driver transistor in ECM
  • Supply fuse or relay not providing stable voltage

Fault status

⚠️ Status
Cylinder 6 injector circuit voltage higher than expected (Injector A). Possible open circuit, short to battery, poor connection, failed injector, or ECM driver issue. MIL stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours
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Code

P0277

LAND ROVER P — Powertrain

Injector circuit of cylinder 6 high Cylinder 6 injector circuit

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 13 EN: 31 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring in injector harness (cylinder 6)
  • Connector corrosion, bent pins, or poor terminal contact at injector
  • Short to battery voltage on the injector driver circuit
  • Failed fuel injector (internal electrical fault)
  • Faulty engine control module (injector driver)
  • Blown or intermittent injector supply fuse or failed relay

Symptoms

  • Malfunction indicator lamp (MIL) on
  • Rough idle or engine misfire at cylinder 6
  • Poor acceleration or reduced power
  • Reduced fuel economy
  • Hard starting or stumble on acceleration
  • Possible intermittent symptoms if wiring is intermittent

What to check

  • Read freeze frame and live data for injector pulse width and misfire counters
  • Inspect wiring harness and connector for cylinder 6 for damage, corrosion, or loose pins
  • Verify battery voltage at ignition on at the injector supply pin
  • Backprobe injector connector while cranking/running to observe driver behavior
  • Measure injector coil resistance (compare to spec or another cylinder)
  • Use a noid light or oscilloscope to confirm injector drive pulses

Signal parameters

  • Injector supply (reference) pin: battery voltage with key ON
  • Injector driver pin: should be near battery voltage when not commanded and pulse toward ground when commanded
  • Pulse width: varies with load and rpm (typically a few milliseconds at idle; increases under load)
  • Injector coil resistance: varies by injector type (low-impedance injectors ~2–4 ohms, high-impedance ~10–16 ohms); compare to vehicle spec or another cylinder
  • Current draw: injector pulse current typically peaks while energized; use manufacturer spec or measure with appropriate tools

Diagnostic algorithm

  1. Retrieve all DTCs and freeze-frame data. Confirm P0277 and note conditions (rpm, temp, voltage).
  2. Visually inspect cylinder 6 injector connector, wiring harness, and nearby components for damage, heat, abrasion, or corrosion.
  3. With ignition ON (engine OFF), verify battery voltage at the injector supply/reference terminal. If no supply, inspect fuses/relay and wiring to battery/ignition feed.
  4. Backprobe the injector driver terminal while cranking or running. Observe signal: driver should pull toward ground in pulses. If driver remains at battery voltage (high), there may be an open or short-to-battery; if driver is low when idle but not pulsing, ECM command or ground issue possible.
  5. Check injector coil resistance at the connector (unplugged). Compare to specification or another cylinder. Significant deviation indicates a faulty injector.
  6. Use a noid light or oscilloscope to confirm injector pulse presence and waveform quality. Look for irregular amplitude, absent pulses, or noisy waveform.
  7. Perform a wiggle test on wiring and connectors while observing live data or scope for changes. Repair any intermittent faults found.
  8. Swap the suspect injector with a known-good injector from another cylinder (if identical) and rerun to see if the fault follows the injector. If it follows, replace the injector.
  9. If wiring and injector check good but issue persists, inspect ECM grounds and harness continuity to the ECM. If suspect ECM driver failure, verify using manufacturer procedures before replacing ECM.
  10. After repairs, clear codes and perform a test drive under the same conditions that set the code to confirm repair.

Likely causes

  • Corroded/loose connector at cylinder 6 injector
  • Broken/shorted wire to injector (pinched or chafed)
  • Injector internal short (coil or solenoid failure)
  • Faulty injector driver transistor in ECM
  • Supply fuse or relay not providing stable voltage

Fault status

⚠️ Status
Cylinder 6 injector circuit voltage higher than expected (Injector A). Possible open circuit, short to battery, poor connection, failed injector, or ECM driver issue. MIL stored.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours
160

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