P0604

P0604 means: Internal Control Module Random Access Memory Error. The ECM's RAM has failed an internal self-test.

Internal Control Module Random Access Memory Error

The ECM's RAM has failed an internal self-test.

SeverityCritical

CategoryElectrical

Est. Repair Cost$300-$1200

Code TypePowertrain

DIY RepairProfessional

💡 Pro Tip: This is typically a hardware-level fault - unlike a checksum error, a RAM fault usually cannot be fixed by reflashing.

Full Repair Estimate

$300-$1200

DIY Possible?

PRO

Severity

Critical

What does OBD2 code P0604 mean?+

P0604 stands for Internal Control Module Random Access Memory Error. The ECM's RAM has failed an internal self-test.

What causes code P0604?+

ECM hardware fault; Voltage spike damage; Extreme heat exposure to ECM

How do I fix code P0604?+

Clear codes and retest; Check ECM mounting location for heat/moisture exposure; Replace ECM if error persists

How much does it cost to fix P0604?+

Estimated repair cost for P0604 is $300-$1200.

Is P0604 DIY-friendly?+

P0604 typically requires professional equipment and a qualified mechanic.