Enter a 5-character code such as P0420, P0301, or P0457.

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Codes starting with P are engine and transmission, B are body, C are chassis, and U are network communication. A 0 as the second character means a generic code shared by all makes; a 1 means a manufacturer-specific code, so its meaning depends on your brand.

A steady check engine light usually means get it checked soon. A flashing check engine light means an active misfire: reduce speed and stop driving as soon as it is safe.

That doesn't look like an OBD-II code

A valid code is one letter (P, B, C, or U) followed by four characters, for example P0420.

P0606 Engine control module (ECM/PCM) processor fault

Can I drive with P0606?

Drive with caution

Stop if the engine stalls, hesitates or won't restart.

The engine computer found an internal error. Behavior can be unpredictable, including stalling.

What does P0606 mean?

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

What causes P0606?

Outdated or corrupted software
Poor ground connection or low voltage
Failed engine computer
Water damage to the computer

How much does it cost to fix P0606?

$100 – $1,500

Reprogramming: $100–$250. Replacement computer: $500–$1,500.

Confirm the code yourself

A low-cost scanner lets you read the code, clear it, and see if it comes back before paying for a diagnosis.

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