P0606

What it means

This code means the engine's main computer, the Powertrain Control Module (PCM), has detected an internal error or malfunction within its own processor. It's like the brain of the car having a stroke.

Is it safe to drive?

This code indicates a critical failure of the engine's main computer. Driving is highly unsafe as the engine could stall, run erratically, or cause other systems to fail without warning.

Most likely causes

• Internal PCM Failure

  high

  The most common cause is an internal defect or failure within the PCM's hardware or software.

• Voltage/Ground Issues to PCM

  medium

  Poor power supply or ground connections to the PCM can cause internal errors or erratic behavior.

• Wiring Harness Damage

  low

  Severe damage to the wiring harness connected to the PCM can interfere with its operation.

• Software Glitch/Corruption

  low

  Rarely, a software glitch or corruption can cause the processor to report an internal fault.

Related help

• Full P0606 diagnosis, causes & costs
• How to read check engine light codes
• Is it safe to drive with the light on?