Cylinder 6 Contribution/Balance Fault
P0278 — Cylinder 6 Contribution/Balance Fault
System: Powertrain | Type: Generic (OBD-II Standard) | Make: Generic
P0278 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.
Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.
Because P0278 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.
The P0278 fault code is set when the powertrain control module (PCM) detects an imbalance or insufficient power contribution from cylinder 6. This is determined by monitoring crankshaft speed variations, which may indicate a problem with fuel delivery, compression, or ignition specific to cylinder 6.
Detailed possible causes for P0278 are available to TaT members.
Unlock with Free TrialStep-by-step diagnostic guidance for P0278 is available to TaT members. Our Diagnostic Assistant provides professional-level troubleshooting procedures written by experienced technicians.
Unlock with Free Trial| Code | P0278 |
| System | Powertrain |
| Type | Generic (OBD-II Standard) |
| Make | Generic |
| Causes | Available |
| Diag. Assistant | Available |
| Video | — |
Get complete diagnostic info, causes, and repair guidance.
Start Free 7-Day Trial Member LoginSearch all 8,602 fault codes with complete diagnostic details, possible causes, and repair guidance.
Start Your Free 7-Day Trial Member Login© 2026 The Automotive Technician (TaT) — www.tat.net.au