P0604: owner reports and bulletins

Powertrain (generic, all makes). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P0604 on your scanner? Tell the mechanic your year, make, model and any symptoms and you'll get the likely cause and what to check first. Ask about this code.

What owners report to NHTSA

5 complaints filed with NHTSA mention P0604, 3 of them since 2015, across 5 different models. The component owners most often filed it under: electrical system.

Manufacturer service bulletins that name P0604

76 technical service bulletins and manufacturer communications filed with NHTSA mention P0604, from 14 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • MASERATI MC20 (2024), bulletin 10236181: Technical Information regarding possible repair of ECM-DTC 060400(P0604-00) - Internal Control Module Random Access Memory (RAM) Error.
  • JEEP GRAND WAGONEER (2023), bulletin 10247492: Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble …
  • JEEP WAGONEER (2023), bulletin 11006243: "Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find one or more of the following Diagnostic Trouble…
  • RAM 2500 (2019), bulletin 10180257: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module (ECM) / Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunc…
  • RAM 3500 (2019), bulletin 10220943: Flash: Powertrain Control Module (PCM) Updates This bulletin involves reprogramming the Engine Control Module (ECM) / Powertrain Control Module (PCM) with the latest available software. Customers may experience a Malfunc…
  • CADILLAC ESCALADE (2016, 2017, 2018), bulletin 10151817: This Preliminary information communicates to the dealer an issue where the vehicle's service engine soon light may illuminate due to trouble codesP0601-P0604, P0606, P062B, P062F, P0630, P16F3, or P262B . The dealer is t…

Sources: NHTSA Office of Defects Investigation complaint database and manufacturer communications file, snapshots September 2026. A complaint or bulletin that mentions a code is a report about that vehicle, not a statement that the code has one cause.