Fault code P0600 – a step-by-step guide to diagnosing and fixing it

Error code P0600 is displayed and the check engine light is on - what does this mean?

The DTC P0600 is recognized by the OBD system if there is an internal communication error in the engine control unit (ECM/PCM). This error code indicates a fault in the internal data processing or memory transfer of the control unit. This code may have slightly different names for different manufacturers, but always refers to internal ECM communication problems.

What causes can this error code have?

• Defective engine control unit (ECM/PCM)
• Corrupt software in the control unit
• Damaged internal memory modules
• Voltage fluctuations in the power supply
• Overheating of the control unit
• Defective internal processors or microchips
• Water damage to the ECM
• Failure of electronic components due to ageing
• Faulty firmware updates

What symptoms occur in parallel with error code P0600?

• Engine performance problems: Reduced power, rough idling or sudden drops in power while driving.
• Starting problems: The vehicle is difficult to start or no longer starts at all.
• Irregular engine running smoothness: Engine runs unevenly, stutters or stalls while driving.
• Electronic faults: Failure of various electronic systems because the ECM no longer controls other modules correctly.
• Shifting problems: Shifting problems can occur with automatic transmissions because communication between the ECM and TCM is disrupted.

How can the problem with error code P0600 be rectified?

• The repair of error code P0600 usually requires professional diagnosis, as it is an internal ECM problem.
• Perform an ECM reset: Disconnect battery for 15 minutes and allow all capacitors to discharge, then reinitialize control unit
• Install firmware update: Have the latest software version for the engine control unit installed by the authorized dealer
• Check the power supply: Check all fuses, relays and cable connections to the ECM for proper function
• Replace the ECM: Replace the defective engine control unit with a new or reconditioned one and have it programmed
• Professional diagnostics: Use special diagnostic software to test the internal ECM modules individually and identify defective components