Code
P0296
Generic
P — Powertrain
Cylinder 12 Contribution/Balance
Views:
UK: 13
EN: 25
RU: 15
AI status
Completed
Completed
100%
Causes
- Faulty fuel injector (stuck open/closed or leaking)
- Weak or failed ignition components (coil, spark plug, plug wire)
- Low compression in cylinder 12 (worn rings, valve seating, head gasket)
- Intake or vacuum leak affecting only cylinder 12
- Wiring or connector faults to injector or ignition coil
- Fuel pressure or fuel trim issues
Symptoms
- Rough idle or engine vibration
- Illuminated MIL (Check Engine Light)
- Poor acceleration or reduced power
- Increased fuel consumption or black smoke
- Failed emissions test
- Possible misfire counters incrementing for cylinder 12
What to check
- Read and record freeze frame and all related DTCs
- Check live data: cylinder contribution/balance values and misfire counters
- Inspect wiring and connectors for coil and injector at cylinder 12
- Perform resistance check on ignition coil and continuity on injector circuit
- Swap coil/injector with another cylinder to see if fault follows component
- Perform cylinder compression and/or leak-down test
Signal parameters
- Cylinder contribution or balance value (engine controller PID)
- Misfire counts by cylinder
- Short-term and long-term fuel trims (STFT/LTFT)
- Injector pulse width (ms) for cylinder 12
- Ignition dwell/primary and secondary signals
- Fuel rail pressure (psi/bar)
Diagnostic algorithm
- Retrieve freeze frame and all stored DTCs. Note engine conditions (load, rpm, temp).
- Check for related misfire codes (P0300 or cylinder-specific P030x/P031x) and address multiple faults first.
- Inspect wiring, connectors, and grounds for injector and coil at cylinder 12 for damage, corrosion, or poor connection.
- Using a scan tool, monitor real-time cylinder contribution/power balance and misfire counters while idling and under load.
- Perform a basic swap test: swap the coil and/or injector with a known-good cylinder. If the imbalance/misfire moves with the component, replace the faulty part.
- If swap does not move the fault, perform a compression test and/or leak-down test on cylinder 12 to rule out mechanical causes.
- Check fuel pressure and fuel delivery; inspect for clogged injector or return line issues. Consider an injector flow/test or cleaning if electrical checks pass.
- Verify ignition secondary (spark) with a scope or suitable tool; check plug condition and gap.
- Inspect intake manifold and vacuum lines for localized leaks affecting cylinder 12; repair as required.
- Verify cam/crank timing and timing chain/belt condition; correct timing issues before replacing other parts.
- If all circuits, mechanicals, and sensors test good, consider PCM or harness-level diagnostics and consult manufacturer service information before replacement.
- After repair, clear codes and test drive to confirm the fault does not return; recheck live data and misfire counters.
Likely causes
- Faulty injector or injector circuit affecting cylinder 12
- Ignition coil or spark plug failure on cylinder 12
- Mechanical compression loss in cylinder 12
- Wiring/connectors to injector/coil for cylinder 12
- Fuel pressure or delivery problem localized to that cylinder
Fault status
Status
Cylinder 12 Contribution/Balance — PCM detected abnormal contribution from cylinder 12 relative to other cylinders.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P0296
GWM
P — Powertrain
- 12 cylinders are incorrectly balanced
Views:
UK: 0
EN: 4
RU: 1
AI status
Completed
Completed
100%
Causes
- Faulty fuel injector (stuck open/closed or leaking)
- Weak or failed ignition components (coil, spark plug, plug wire)
- Low compression in cylinder 12 (worn rings, valve seating, head gasket)
- Intake or vacuum leak affecting only cylinder 12
- Wiring or connector faults to injector or ignition coil
- Fuel pressure or fuel trim issues
Symptoms
- Rough idle or engine vibration
- Illuminated MIL (Check Engine Light)
- Poor acceleration or reduced power
- Increased fuel consumption or black smoke
- Failed emissions test
- Possible misfire counters incrementing for cylinder 12
What to check
- Read and record freeze frame and all related DTCs
- Check live data: cylinder contribution/balance values and misfire counters
- Inspect wiring and connectors for coil and injector at cylinder 12
- Perform resistance check on ignition coil and continuity on injector circuit
- Swap coil/injector with another cylinder to see if fault follows component
- Perform cylinder compression and/or leak-down test
Signal parameters
- Cylinder contribution or balance value (engine controller PID)
- Misfire counts by cylinder
- Short-term and long-term fuel trims (STFT/LTFT)
- Injector pulse width (ms) for cylinder 12
- Ignition dwell/primary and secondary signals
- Fuel rail pressure (psi/bar)
Diagnostic algorithm
- Retrieve freeze frame and all stored DTCs. Note engine conditions (load, rpm, temp).
- Check for related misfire codes (P0300 or cylinder-specific P030x/P031x) and address multiple faults first.
- Inspect wiring, connectors, and grounds for injector and coil at cylinder 12 for damage, corrosion, or poor connection.
- Using a scan tool, monitor real-time cylinder contribution/power balance and misfire counters while idling and under load.
- Perform a basic swap test: swap the coil and/or injector with a known-good cylinder. If the imbalance/misfire moves with the component, replace the faulty part.
- If swap does not move the fault, perform a compression test and/or leak-down test on cylinder 12 to rule out mechanical causes.
- Check fuel pressure and fuel delivery; inspect for clogged injector or return line issues. Consider an injector flow/test or cleaning if electrical checks pass.
- Verify ignition secondary (spark) with a scope or suitable tool; check plug condition and gap.
- Inspect intake manifold and vacuum lines for localized leaks affecting cylinder 12; repair as required.
- Verify cam/crank timing and timing chain/belt condition; correct timing issues before replacing other parts.
- If all circuits, mechanicals, and sensors test good, consider PCM or harness-level diagnostics and consult manufacturer service information before replacement.
- After repair, clear codes and test drive to confirm the fault does not return; recheck live data and misfire counters.
Likely causes
- Faulty injector or injector circuit affecting cylinder 12
- Ignition coil or spark plug failure on cylinder 12
- Mechanical compression loss in cylinder 12
- Wiring/connectors to injector/coil for cylinder 12
- Fuel pressure or delivery problem localized to that cylinder
Fault status
Status
Cylinder 12 Contribution/Balance — PCM detected abnormal contribution from cylinder 12 relative to other cylinders.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
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Code
P0296
HUMMER
P — Powertrain
Cylinder 12 Contribution/Range Fault
Views:
UK: 6
EN: 21
RU: 5
AI status
Completed
Completed
100%
Causes
- Faulty fuel injector (stuck open/closed or leaking)
- Weak or failed ignition components (coil, spark plug, plug wire)
- Low compression in cylinder 12 (worn rings, valve seating, head gasket)
- Intake or vacuum leak affecting only cylinder 12
- Wiring or connector faults to injector or ignition coil
- Fuel pressure or fuel trim issues
Symptoms
- Rough idle or engine vibration
- Illuminated MIL (Check Engine Light)
- Poor acceleration or reduced power
- Increased fuel consumption or black smoke
- Failed emissions test
- Possible misfire counters incrementing for cylinder 12
What to check
- Read and record freeze frame and all related DTCs
- Check live data: cylinder contribution/balance values and misfire counters
- Inspect wiring and connectors for coil and injector at cylinder 12
- Perform resistance check on ignition coil and continuity on injector circuit
- Swap coil/injector with another cylinder to see if fault follows component
- Perform cylinder compression and/or leak-down test
Signal parameters
- Cylinder contribution or balance value (engine controller PID)
- Misfire counts by cylinder
- Short-term and long-term fuel trims (STFT/LTFT)
- Injector pulse width (ms) for cylinder 12
- Ignition dwell/primary and secondary signals
- Fuel rail pressure (psi/bar)
Diagnostic algorithm
- Retrieve freeze frame and all stored DTCs. Note engine conditions (load, rpm, temp).
- Check for related misfire codes (P0300 or cylinder-specific P030x/P031x) and address multiple faults first.
- Inspect wiring, connectors, and grounds for injector and coil at cylinder 12 for damage, corrosion, or poor connection.
- Using a scan tool, monitor real-time cylinder contribution/power balance and misfire counters while idling and under load.
- Perform a basic swap test: swap the coil and/or injector with a known-good cylinder. If the imbalance/misfire moves with the component, replace the faulty part.
- If swap does not move the fault, perform a compression test and/or leak-down test on cylinder 12 to rule out mechanical causes.
- Check fuel pressure and fuel delivery; inspect for clogged injector or return line issues. Consider an injector flow/test or cleaning if electrical checks pass.
- Verify ignition secondary (spark) with a scope or suitable tool; check plug condition and gap.
- Inspect intake manifold and vacuum lines for localized leaks affecting cylinder 12; repair as required.
- Verify cam/crank timing and timing chain/belt condition; correct timing issues before replacing other parts.
- If all circuits, mechanicals, and sensors test good, consider PCM or harness-level diagnostics and consult manufacturer service information before replacement.
- After repair, clear codes and test drive to confirm the fault does not return; recheck live data and misfire counters.
Likely causes
- Faulty injector or injector circuit affecting cylinder 12
- Ignition coil or spark plug failure on cylinder 12
- Mechanical compression loss in cylinder 12
- Wiring/connectors to injector/coil for cylinder 12
- Fuel pressure or delivery problem localized to that cylinder
Fault status
Status
Cylinder 12 Contribution/Balance — PCM detected abnormal contribution from cylinder 12 relative to other cylinders.
Repair difficulty: Medium
Diagnostic time: 1-3 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