Trouble code · Powertrain · Generic (all makes)

P0606 Control Module Processor Fault

The engine computer's self-test found a problem with its own processor or memory.

Safe to drive?
Drive with caution
Get it fixed soon
Scanner you need
Any OBD2 scanner
Even a basic code reader shows it
NHTSA complaints quoting it
20
Vehicle complaints, 2015–2025

Common causes

  • Internal engine computer fault
  • Low or unstable voltage
  • Poor computer ground
  • Water damage
  • A software problem that a reflash can fix

Symptoms

  • Check engine light
  • Stalling
  • No-start
  • Limp mode
  • Sometimes no symptoms at all

Can I drive with it?

It depends on the symptoms. If the car stalls or goes into limp mode, have it towed rather than driven.

Tip: Check the battery, terminals and engine grounds first, and ask a dealer whether a software update or service bulletin covers your car before replacing the computer.

Which scanner reads it?

Any OBD2 scanner reads it. Fixing it usually needs a dealer or shop tool to reflash or program the computer.

Budget tools like the ANCEL AD310 read it; tools with live data and graphing – like the BlueDriver or OBDLink MX+ – help you find the cause. Not sure which fits you? Try the Find My Scanner quiz.

In the data

Of the vehicle complaints owners filed with NHTSA from 2015 to 2025, 20 quote P0606 – most often from Ford, Chevrolet, Dodge owners. Complaints lean toward serious problems, so treat this as a sign of how often the code turns up in real reports, not how often cars get it.

Both sources are compared on the Trends page.

General information to help you understand a code – not a diagnosis. Your car’s service information or a qualified mechanic has the final word. See how we research.