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Trouble code libraryComputer and outputs

P0603 Internal control module keep alive memory (KAM) error

Code familyComputer or wiring fault

Short trips onlyDrive it only if you have to, gently and not far. Get it fixed right away.

Check this first

Have power, grounds and the battery checked before anyone talks about a new computer.

What usually fixes it

In the order a good shop checks them. Typical total: $166–$1,906 at $130 an hour.

  1. Battery, grounds and connections

    $166–$594

    Most computer codes come from poor power.

  2. Control module

    $660–$1,906

    A genuinely failed module usually needs programming.

This is the advice for this family of codes – Drive DTC doesn't have advice written for P0603 on its own yet.

Code titles are the generic SAE definitions. Prices are typical US parts and labor for a common car or light truck – a guide for judging a quote, not a quote. Always confirm a repair against the vehicle in front of you.

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See what your vehicle says about P0603

A stored code is a headline, not the story. The vehicle also holds the conditions from the moment the code set, how close each part is to the limit it fails at, what the fuel trims are doing, and whether the fault is still happening. Drive DTC reads all of it with a USB adapter and a Windows PC – read-only by design.

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The Trouble codes screen in Drive DTC: stored, pending and permanent counts, then C0040-13 explained in plain English with what to check first, likely fixes in order and typical cost ranges

More in Computer and outputs

All 4 codes in this group
P0600Serial communication link P0605Internal control module read only memory (ROM) error P0606Control module processor