Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2004FOCUS ZX3, 2.3 Z, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - POWERTRAIN DTC CHARTS & DESCRIPTIONS - CNG, FLEX-FUEL & GASOLINEDIAGNOSTIC TROUBLE CODE (DTC) CHARTSP0606 - POWERTRAIN CONTROL MODULE INTERNAL COMMUNICATION ERROR
2004 Ford Focus ZX3, 2.3 Z, Standard
P0606 - Powertrain Control Module Internal Communication Error
2004 Ford Focus ZX3, 2.3 Z, StandardSECTION P0606 - Powertrain Control Module Internal Communication Error
P0606 - POWERTRAIN CONTROL MODULE INTERNAL COMMUNICATION ERROR
| Description: | P0606 indicates a register readback (PCM internal communications) error. | ||
| Possible Causes: |
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| Diagnostic Aids: | Internal PCM failure. Replace the PCM. For Electronic Throttle Control applications, an internal PCM failure, or an ETC system FMEM condition exists. Repairing the other DTCs can fix the P0606. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Vehicles with electronic throttle control (ETC) | DTC is an indication of a failure mode in the Electronic Throttle Control system, which includes the APPS, ETB, and PCM. It is accompanied by other DTCs which provide repair direction. Proceed to DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTION table to repair those DTCs, and the P0606 will not be reset. | DTC is an indication of a failure mode in the Electronic Throttle Control system, which includes the APPS, ETB, and PCM. It is accompanied by other DTCs which provide repair direction. Proceed to DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTION table to repair those DTCs, and the P0606 will not be reset. | DTC is an indication of a failure mode in the Electronic Throttle Control system, which includes the APPS, ETB, and PCM. It is accompanied by other DTCs which provide repair direction. Proceed to DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTION table to repair those DTCs, and the P0606 will not be reset. |
| All Others | Be sure to check for aftermarket performance products before replacing the PCM. If replacement is necessary, refer to DIAGNOSTIC METHODS - CNG, FLEXFUEL & GASOLINE | Be sure to check for aftermarket performance products before replacing the PCM. If replacement is necessary, refer to DIAGNOSTIC METHODS - CNG, FLEXFUEL & GASOLINE | Be sure to check for aftermarket performance products before replacing the PCM. If replacement is necessary, refer to DIAGNOSTIC METHODS - CNG, FLEXFUEL & GASOLINE |
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.