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TuningBot DTC Database · v4.37.14

P0604 Internal Control Module Random Access Memory (RAM) Error

Generic (OBD-II) interpretation in the TuningBot DTC database.

P · PowertrainSoftwareOBD2

What P0604 means

P0604
Internal Control Module Random Access Memory (RAM) Error Generic · software Data confidence 90%

The control module registered the fault condition described as "Internal Control Module Random Access Memory (RAM) Error".

Symptoms

  • MIL illuminated
  • Symptoms depend on the affected internal function

Possible causes

ECM

Recommended checks

  • Check control module power supplies and grounds first
  • Check battery condition and charging voltage
  • Verify software version and check OEM bulletins
  • Clear the code and retest under the original conditions
  • Only after supply-side checks, consider module assessment

Related and nearby codes

P06 range
P0600P0601P0602P0603P0605P0606P0607P0608P0609P060AP060BP060CP060DP060EP060FP0610P0611P0612

How to read P0604

P

Powertrain: engine, transmission and driveline systems.

0

Generic SAE-standard code: same meaning on every make.

604

Specific fault index within the subsystem.

Frequently asked questions about P0604

What does P0604 mean?

Internal Control Module Random Access Memory (RAM) Error. The control module registered the fault condition described as "Internal Control Module Random Access Memory (RAM) Error".

Is P0604 generic or manufacturer-specific?

P0604 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove P0604 at file level?

If the fault logic lives in the ECU calibration, yes: our DTC Removal file service disables the specific fault entry and, where the ECU needs it, corrects the checksum too. Not sure whether your case qualifies? Request a free assessment and our engineers will check your ECU file.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Diagnostic Strategy and DTC Logic

ECU tuningDyno-tested results by model and engine See the results →

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