Code
P0293
Generic
P — Powertrain
Cylinder 11 Contribution/Balance
Views:
UK: 13
EN: 13
RU: 9
AI status
Completed
Completed
100%
Causes
- Faulty or weak ignition (coil, spark plug, plug wire, ignition module) on cylinder 11
- Stuck, clogged, leaking, or electrically faulty fuel injector for cylinder 11
- Low compression or mechanical damage on cylinder 11 (worn rings, burnt valve, blown head gasket)
- Wiring or connector fault for injector or ignition circuit on cylinder 11
- Intake or vacuum leak affecting only cylinder 11 (intake manifold gasket, port gasket)
- Camshaft/crankshaft timing error or actuator fault causing poor cylinder timing
Symptoms
- Illuminated MIL / Check Engine lamp
- Rough idle or vibration, particularly at low rpm
- Loss of power or hesitation under load
- Poor fuel economy
- Possible misfire detected at certain RPM/load conditions
- Intermittent drivability problems that can be repeatable or sporadic
What to check
- Read and record freeze frame and all current/past stored codes and pending counts
- Monitor live data: misfire counters, long/short term fuel trims, O2/HEGO readings, and injector pulse widths
- Check for related codes (misfire codes, fuel trim codes, sensor codes)
- Inspect ignition components (spark plug, coil, wires) on cylinder 11 for wear, corrosion, or damage
- Visually inspect injector connector and wiring for open, short or corrosion
- Measure fuel rail pressure to verify system supply is within specification
Signal parameters
- Misfire counter for cylinder 11 (counts/min or events)
- Relative cylinder contribution (%) or cylinder trim values from ECM
- Short term and long term fuel trim (STFT/LTFT)
- Injector pulse width (ms) for cylinder 11
- Ignition dwell/coil primary/secondary waveform and spark voltage
- Crankshaft position sensor and camshaft position sensor signals/time correlation
Diagnostic algorithm
- Retrieve freeze frame and related fault codes. Note engine load, RPM, coolant temperature and fuel trims at the time of the fault.
- Monitor live misfire counters and cylinder contribution data while running at idle and under load. Confirm cylinder 11 consistently under/over-contributes.
- Swap the ignition coil (or coil pack) from cylinder 11 with a known-good cylinder. Re-test to see if the contribution fault follows the coil.
- Swap the fuel injector from cylinder 11 with a known-good cylinder or use a noid light / oscilloscope to verify injector pulse and coil/driver operation. Re-test.
- Perform a relative cylinder shut-off (disable) test with scan tool or manually disable injector for cylinder 11 and compare RPM drop to other cylinders to confirm contribution differences.
- Perform a static compression or a wet compression test and/or leak-down test on cylinder 11 to check for mechanical issues.
- Inspect and test wiring and connectors for injector and ignition circuits for continuity, shorts to ground/power, and corrosion. Repair as needed.
- Verify fuel system pressure and delivery; check for clogged fuel rail or injector screens. Clean or replace injector if hydraulic issue suspected.
- Verify cam/crank timing and variable timing actuator operation. Correct timing or replace faulty actuator/sensor if out of spec.
- Inspect intake and exhaust for local leaks or restrictions (intake gasket, EGR port, exhaust manifold) that could affect that cylinder.
- If tests above are inconclusive, capture ignition and injector waveforms with an oscilloscope to compare patterns against a good cylinder and consult manufacturer-specific troubleshooting for ECM or sensor calibration.
- After repair, clear codes and perform a drive cycle to confirm fault does not return and that contribution values return to normal.
Likely causes
- Ignition component failure (coil or spark plug) on cylinder 11
- Injector electrical failure or internal leakage/clogging on cylinder 11
- Low static or dynamic compression on cylinder 11
- Damaged wiring harness or corroded connector at cylinder 11 components
- Localized intake manifold gasket failure at cylinder 11
Fault status
Status
Cylinder 11 contribution/balance abnormal — ECM detected that cylinder 11's contribution differs significantly from expected values. Investigate ignition, fuel, mechanical condition, wiring/connectors, and timing. Intermittent faults may require extended live-data capture and component swap testing.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0293
GWM
P — Powertrain
- 11 cylinder is incorrectly balanced
Views:
UK: 2
EN: 4
RU: 0
AI status
Completed
Completed
100%
Causes
- Faulty or weak ignition (coil, spark plug, plug wire, ignition module) on cylinder 11
- Stuck, clogged, leaking, or electrically faulty fuel injector for cylinder 11
- Low compression or mechanical damage on cylinder 11 (worn rings, burnt valve, blown head gasket)
- Wiring or connector fault for injector or ignition circuit on cylinder 11
- Intake or vacuum leak affecting only cylinder 11 (intake manifold gasket, port gasket)
- Camshaft/crankshaft timing error or actuator fault causing poor cylinder timing
Symptoms
- Illuminated MIL / Check Engine lamp
- Rough idle or vibration, particularly at low rpm
- Loss of power or hesitation under load
- Poor fuel economy
- Possible misfire detected at certain RPM/load conditions
- Intermittent drivability problems that can be repeatable or sporadic
What to check
- Read and record freeze frame and all current/past stored codes and pending counts
- Monitor live data: misfire counters, long/short term fuel trims, O2/HEGO readings, and injector pulse widths
- Check for related codes (misfire codes, fuel trim codes, sensor codes)
- Inspect ignition components (spark plug, coil, wires) on cylinder 11 for wear, corrosion, or damage
- Visually inspect injector connector and wiring for open, short or corrosion
- Measure fuel rail pressure to verify system supply is within specification
Signal parameters
- Misfire counter for cylinder 11 (counts/min or events)
- Relative cylinder contribution (%) or cylinder trim values from ECM
- Short term and long term fuel trim (STFT/LTFT)
- Injector pulse width (ms) for cylinder 11
- Ignition dwell/coil primary/secondary waveform and spark voltage
- Crankshaft position sensor and camshaft position sensor signals/time correlation
Diagnostic algorithm
- Retrieve freeze frame and related fault codes. Note engine load, RPM, coolant temperature and fuel trims at the time of the fault.
- Monitor live misfire counters and cylinder contribution data while running at idle and under load. Confirm cylinder 11 consistently under/over-contributes.
- Swap the ignition coil (or coil pack) from cylinder 11 with a known-good cylinder. Re-test to see if the contribution fault follows the coil.
- Swap the fuel injector from cylinder 11 with a known-good cylinder or use a noid light / oscilloscope to verify injector pulse and coil/driver operation. Re-test.
- Perform a relative cylinder shut-off (disable) test with scan tool or manually disable injector for cylinder 11 and compare RPM drop to other cylinders to confirm contribution differences.
- Perform a static compression or a wet compression test and/or leak-down test on cylinder 11 to check for mechanical issues.
- Inspect and test wiring and connectors for injector and ignition circuits for continuity, shorts to ground/power, and corrosion. Repair as needed.
- Verify fuel system pressure and delivery; check for clogged fuel rail or injector screens. Clean or replace injector if hydraulic issue suspected.
- Verify cam/crank timing and variable timing actuator operation. Correct timing or replace faulty actuator/sensor if out of spec.
- Inspect intake and exhaust for local leaks or restrictions (intake gasket, EGR port, exhaust manifold) that could affect that cylinder.
- If tests above are inconclusive, capture ignition and injector waveforms with an oscilloscope to compare patterns against a good cylinder and consult manufacturer-specific troubleshooting for ECM or sensor calibration.
- After repair, clear codes and perform a drive cycle to confirm fault does not return and that contribution values return to normal.
Likely causes
- Ignition component failure (coil or spark plug) on cylinder 11
- Injector electrical failure or internal leakage/clogging on cylinder 11
- Low static or dynamic compression on cylinder 11
- Damaged wiring harness or corroded connector at cylinder 11 components
- Localized intake manifold gasket failure at cylinder 11
Fault status
Status
Cylinder 11 contribution/balance abnormal — ECM detected that cylinder 11's contribution differs significantly from expected values. Investigate ignition, fuel, mechanical condition, wiring/connectors, and timing. Intermittent faults may require extended live-data capture and component swap testing.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
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Code
P0293
HUMMER
P — Powertrain
Cylinder 11 Contribution/Balance Fault
Views:
UK: 8
EN: 8
RU: 2
AI status
Completed
Completed
100%
Causes
- Faulty or weak ignition (coil, spark plug, plug wire, ignition module) on cylinder 11
- Stuck, clogged, leaking, or electrically faulty fuel injector for cylinder 11
- Low compression or mechanical damage on cylinder 11 (worn rings, burnt valve, blown head gasket)
- Wiring or connector fault for injector or ignition circuit on cylinder 11
- Intake or vacuum leak affecting only cylinder 11 (intake manifold gasket, port gasket)
- Camshaft/crankshaft timing error or actuator fault causing poor cylinder timing
Symptoms
- Illuminated MIL / Check Engine lamp
- Rough idle or vibration, particularly at low rpm
- Loss of power or hesitation under load
- Poor fuel economy
- Possible misfire detected at certain RPM/load conditions
- Intermittent drivability problems that can be repeatable or sporadic
What to check
- Read and record freeze frame and all current/past stored codes and pending counts
- Monitor live data: misfire counters, long/short term fuel trims, O2/HEGO readings, and injector pulse widths
- Check for related codes (misfire codes, fuel trim codes, sensor codes)
- Inspect ignition components (spark plug, coil, wires) on cylinder 11 for wear, corrosion, or damage
- Visually inspect injector connector and wiring for open, short or corrosion
- Measure fuel rail pressure to verify system supply is within specification
Signal parameters
- Misfire counter for cylinder 11 (counts/min or events)
- Relative cylinder contribution (%) or cylinder trim values from ECM
- Short term and long term fuel trim (STFT/LTFT)
- Injector pulse width (ms) for cylinder 11
- Ignition dwell/coil primary/secondary waveform and spark voltage
- Crankshaft position sensor and camshaft position sensor signals/time correlation
Diagnostic algorithm
- Retrieve freeze frame and related fault codes. Note engine load, RPM, coolant temperature and fuel trims at the time of the fault.
- Monitor live misfire counters and cylinder contribution data while running at idle and under load. Confirm cylinder 11 consistently under/over-contributes.
- Swap the ignition coil (or coil pack) from cylinder 11 with a known-good cylinder. Re-test to see if the contribution fault follows the coil.
- Swap the fuel injector from cylinder 11 with a known-good cylinder or use a noid light / oscilloscope to verify injector pulse and coil/driver operation. Re-test.
- Perform a relative cylinder shut-off (disable) test with scan tool or manually disable injector for cylinder 11 and compare RPM drop to other cylinders to confirm contribution differences.
- Perform a static compression or a wet compression test and/or leak-down test on cylinder 11 to check for mechanical issues.
- Inspect and test wiring and connectors for injector and ignition circuits for continuity, shorts to ground/power, and corrosion. Repair as needed.
- Verify fuel system pressure and delivery; check for clogged fuel rail or injector screens. Clean or replace injector if hydraulic issue suspected.
- Verify cam/crank timing and variable timing actuator operation. Correct timing or replace faulty actuator/sensor if out of spec.
- Inspect intake and exhaust for local leaks or restrictions (intake gasket, EGR port, exhaust manifold) that could affect that cylinder.
- If tests above are inconclusive, capture ignition and injector waveforms with an oscilloscope to compare patterns against a good cylinder and consult manufacturer-specific troubleshooting for ECM or sensor calibration.
- After repair, clear codes and perform a drive cycle to confirm fault does not return and that contribution values return to normal.
Likely causes
- Ignition component failure (coil or spark plug) on cylinder 11
- Injector electrical failure or internal leakage/clogging on cylinder 11
- Low static or dynamic compression on cylinder 11
- Damaged wiring harness or corroded connector at cylinder 11 components
- Localized intake manifold gasket failure at cylinder 11
Fault status
Status
Cylinder 11 contribution/balance abnormal — ECM detected that cylinder 11's contribution differs significantly from expected values. Investigate ignition, fuel, mechanical condition, wiring/connectors, and timing. Intermittent faults may require extended live-data capture and component swap testing.
Repair difficulty: Medium
Diagnostic time: 1.5-4.0 hours
Similar codes
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