P0351, P0352, P0353, P0354, P0355 and P0356 concern ignition-coil circuits A to F. The manufacturer’s wiring information establishes how those letters map to the engine. These codes should not be treated as identical to a combustion-misfire code.
Why the failed part matters
If a coil has already been replaced, keep its part number and the workshop’s findings. A damaged load or wiring circuit can affect a controller output, while a controller fault can leave a good component unable to operate. The assessment needs to consider both sides of that relationship.
Ford published a bulletin covering selected vehicles with this group of codes, illustrating that ignition and PCM diagnosis can require a coordinated procedure. Its stated vehicle and production limits must be checked; it is not a universal repair instruction for UK Ford models. Ford technical bulletin 12-8-17.
Evidence worth sending
- Full codes and the engine’s cylinder numbering information.
- Original and replacement coil specifications.
- Whether the same circuit fails again or the fault moves elsewhere.
- Professional supply, connection and control-signal findings.
- ECU label, software identification and details of earlier repair attempts.
Ignition systems generate hazardous voltages. Testing belongs with a technician using appropriate equipment. A flashing engine warning, severe misfire or fuel smell needs prompt assessment rather than continued driving to reproduce the fault.
Ask AXION about ECU testing with the supporting report. Our engine ECU collection also covers injector, supply and communication faults.
Reviewed September 2026. Use the complete manufacturer-specific fault description and vehicle repair information.