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P0606 Control Module Processor Fault

What it means, what causes it, and what it costs to fix.

Engine ComputerGeneric OBD-II

What P0606 means

The engine computer's self-test found an internal processor problem. Sometimes it's really a power or ground issue making the computer misbehave, so check those before replacing the module.

Can I drive with P0606?

Severity: High. Fix right away. It can cause damage or leave you stranded.

Not reliable. The car could stall or go into limp mode without warning. Get it diagnosed before long trips.

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Symptoms

Common causes

Most likely first.

  1. Weak battery or charging system
  2. Bad engine-to-chassis ground
  3. Corroded computer connectors
  4. Internal computer failure
  5. Needed software update

How to diagnose P0606

  1. Test the battery and charging system.
  2. Check and clean the main grounds.
  3. Check for software updates or TSBs from the dealer.
  4. Replace or reprogram the module only after power and grounds check out.

Tip: most US auto parts stores will read your codes for free.

Repair costs

Ground or battery fix$0–$250
Software reflash$100–$250
ECM/PCM replacement + programming$600–$1,800

Typical US prices. Your vehicle, region, and shop rates will change these.

P0606 FAQ

What does P0606 mean?

P0606 means "Control Module Processor Fault." The engine computer's self-test found an internal processor problem. Sometimes it's really a power or ground issue making the computer misbehave, so check those before replacing the module.

Can I drive with a P0606 code?

Not reliable. The car could stall or go into limp mode without warning. Get it diagnosed before long trips.

What is the most common cause of P0606?

The most common cause is: Weak battery or charging system. Other causes include bad engine-to-chassis ground and corroded computer connectors.

How much does it cost to fix P0606?

Typical repairs run about $0 to $1,800 in the US, depending on the cause. Ground or battery fix: $0–$250.

Related codes

P0562

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