P0606 - PCM / ECM PROCESSOR FAULT

The Power Train Control Module (PCM) or Engine Control Module (ECM) controls all aspects of the operation of the engine, including the electrical system.

When the vehicle starts, the ECM or PCM performs a self-test of all the components of the engine and the rest of the vehicle, in order to verify the proper functioning of all these. If after that self-verification, as a result there is a processor failure in the vehicle’s computer, the DTC code P0606 OBD2 is established.

• The Check Engine light turns on.
• ABS antilock brake light illuminates.
• It may turn off when the vehicle stops.
• Increase fuel consumption.

The factors that can lead to the establishment of fault code P0606 OBD II are:

• Cables or connectors that lead to the PCM / ECM may be worn, corroded or defective.
• Short in the power supply circuit of the cables of the Powertrain Control Module / Engine Control module.
• The ECM / PCM ground circuit may be shorted.
• Bad programming of the PCM / ECM.
• ECM / PCM defective.

The steps to follow to correct the faults caused by the diagnostic code P0606 are the following:

• Visually inspect all cables that lead to the PCM. If you find that one of them is worn or rubbed with some other component, you must correct it. Similarly, check the cable connectors, as it may have corrosion. Repair or change as necessary.
• If, even after making the corrections in the electrical system, code P0606 is present, it is necessary to reprogram the PCM or change it. This is a complex task, so you must have special tools with which the mechanic can program the vehicle's computer.