P0602: 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 P0602 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

2 complaints filed with NHTSA mention P0602, 1 of them since 2015, across 1 different models. The component owners most often filed it under: electrical system.

Manufacturer service bulletins that name P0602

13 technical service bulletins and manufacturer communications filed with NHTSA mention P0602, from 10 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • ALLISON 1000 SERIES TRANSMISSION, bulletin 10214181: Servicing tip for vehicles with DTC P0602
  • ALLISON 3000 SERIES TRANSMISSION, bulletin 10232781: Servicing tip for vehicles with DTC P0602
  • JEEP GRAND CHEROKEE (2023, 2022), bulletin 10236798: Long Range Camera Front For concern of Central ADAS Decision Module (CADM) setting C2318-49 - Front Camera Internal Electronic Failure and P0602-00 - Control Module Programming Error/Not Programmed, some recently replace…
  • GMC ENVOY (2007, 2008, 2009, 2010), bulletin 10113571: This informational bulletin communicates Information to technicians on control module Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P0606, P062F, P06F3, P1621 which can be shared in multiple modules.
  • BUICK ENCLAVE (2008, 2009, 2010, 2011), bulletin 10113571: This informational bulletin communicates Information to technicians on control module Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P0606, P062F, P06F3, P1621 which can be shared in multiple modules.
  • CADILLAC ATS (2013, 2014, 2015, 2007), bulletin 10113571: This informational bulletin communicates Information to technicians on control module Diagnostic Trouble Code(s) (DTC)(s) P0601, P0602, P0603, P0604, P0606, P062F, P06F3, P1621 which can be shared in multiple modules.

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.