P0606 - Powertrain Control Module Internal Communication Error
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
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 |