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All codes/P0606

P0606

PCM Processor Fault

Critical — stop driving

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.

ECM/PCM Processor Fault

Common causes

  • Internal PCM Failure

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

    high

    Typical part cost: $500-1500+ part

  • Voltage/Ground Issues to PCM

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

    medium

    Typical part cost: $0-200 repair

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First things to check

  1. 1Check for any other codes present, as they might be symptoms of the PCM fault.
  2. 2Inspect all PCM power and ground wires for corrosion, looseness, or damage.

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Tools you may need

Already have a compatible scanner? Use it. If not, a Bluetooth OBD2 adapter can help you confirm engine codes and check supported live sensor data before replacing parts.

Illustration of a Bluetooth OBD2 adapter, not a product photo

Basic checks

Veepeak OBDCheck BLE

A Bluetooth LE adapter for reading standard engine codes and supported live data.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Regular diagnostics

vgate iCar Pro BLE 4.0

A Bluetooth LE adapter with an automatic sleep feature for routine code and sensor checks.

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Illustration of a Bluetooth OBD2 adapter, not a product photo

Another option

OBDLink CX

A Bluetooth LE adapter to consider when comparing supported vehicles and diagnostic apps.

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Illustrations shown, not product photos. Check vehicle, phone and app compatibility before buying. These adapters do not guarantee access to ABS, airbags or manufacturer-specific systems. Clearing a code does not repair the fault and can reset emissions readiness monitors.

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Related codes

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Frequently asked questions

What is the PCM?

The PCM (Powertrain Control Module) is the main computer that controls the engine and often the transmission, managing everything from fuel injection and ignition timing to emissions and diagnostics.

Can I fix a P0606 myself?

Fixing a P0606 is typically beyond DIY capabilities. It usually requires specialized diagnostic tools, and often, the replacement and programming of a new PCM by a professional technician.

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