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P0600 Severity
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
The engine control module (PCM) performs many vital functions in a modern vehicle, including management of the Fuel and Ignition Systems. When the PCM loses communication with one or more control modules it will set code P0600.
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OBD-II Code P0600 is defined as a PCM Serial Communication Link Malfunction
The PCM or Power Train Control Module performs many vital functions in a modern vehicle, such as management of the Fuel System, Ignition System, Transmission, Anti-Lock Brake and Traction Control systems. The Serial Communication Link enables the control modules to 'talk ' to each other.
When the code P0600 is set in the Powertrain Computer, it means that the Powertrain Computer or PCM has lost communication with 1 or more other control modules.
The PCM shares data input with several different systems and if the communication link between them fails, then 1 or more systems will shut down. The cause of the P0600 code may be a defective data bus, a defective data bus connection, or a defective control module. If you have to replace a module, make sure that you inspect all of the module's output devices and wiring for shorted circuits or else the new module will fail in short order. When diagnosing a P0600 code, it is important to record any other codes and the P0600 freeze frame data. Then one should duplicate the code setting conditions with a test drive. Pay close attention to the engine load, throttle position, RPM, and road speed because a P0600 can be difficult to detect.