I have a 2009 Ford Focus SES and my check engine light came on so I took it in to get the computer read and we got the same code 7 times here is the code PO600. Does anyone know how i can fix it?

Brittany Mann

Asked by Oct 03, 2016 at 05:53 PM about the 2009 Ford Focus SES

Question type: Maintenance & Repair

8 Answers




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Possible causes - - Faulty Engine control Module (ECM) - Engine control Module(ECM) harness is open or shorted - Engine control Module (ECM) cicuit poor electricl connection - Low battery voltage


Look for all engine block to frame grounds and computer ground and all fuses under dash & hood. Make sure all electrical connections are good & tight.


Explanation of OBD code P0600 Your vehicle's ECM or power train control module (PCM) has lost its control over one or more actuator modules. Most vehicles have as many as 18 actuators that the primary ECM controls. It does so through a controller area network (Can Bus Automotive Network), which is a series of wiring harnesses from the ECM to the controllers. The controllers operated by the ECM, known as modules, control the majority of the functions of your vehicle. The code P0600 was set when the ECM recognized a loss of communication and control over one or more of these modules for eight consecutive starts.


This is a list of the primary control modules operated by the ECM: Fuel injection system, Ignition system, Variable camshaft timing, Turbo charger, Emission systems, Air conditioning, Transmission shift points, Body ride control, ABS brakes, Cruise control, Anti-theft, Sunroof and seat position, Power windows, Traction control systems, Proximity alerts. These are just a few, not to mention all the available computer controlled options available today.


Experience has proven that a poor connection or failed ECM driver is the root cause of this code. For the most part, the ECM acts as a ground to control these components and modules as opposed to supplying power to them. A loose or corroded connector is more likely than a frayed or broken wire between both devices. Poor grounds are another plausible cause. The ECM, as well as the activator module, need a good ground to operate. The wiring harness or Can Bus may be defective and have a short to ground or an open wire.


If no shorts or ground problems are found and all fuses and connections are good. The best advice concerning the diagnosis and repair of this particular code is to take the vehicle to a professional technician that has a Autohex or Tech II diagnostic computer. If you unplug the ECM or the associated wiring and then probe the terminals, your bank account could suffer extreme consequences. Most vehicles need to have a memory saver installed before disconnecting the battery to retain the ECM's memory. Should the ECM lose its memory due to lack of power, the vehicle will not start until reprogrammed at the dealer. Probing the wiring must be done systematically using the wiring diagram and pin values. If you probe the wrong terminal, the ECM and/or its associated module will be destroyed. A competent technician will program your vehicle's information into his Autohex or similar diagnostic computer in preparation to diagnose the P0600 code. He will then start the vehicle and monitor all the systems in real time. The tool shows the pin values and modules in operation and indicates any abnormalities. It's an essential tool for diagnosing wiring or computer related problems without running the risk of damaging any components. If you're fortunate, symptoms or an additional code following code P0600 will steer you to the system in question experiencing the communication failure. Upon identifying the system through symptoms or an additional code, check the connections for discrepancies such as loose or corroded terminals. A service manual with the wiring diagrams, pin values, locations of connectors, precautions and procedures are imperative.

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