P1235: owner reports and bulletins

Powertrain (manufacturer-specific). We haven't written the explanation for this code yet. Below is what owners and manufacturers have filed with NHTSA.

Got P1235 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

3 complaints filed with NHTSA mention P1235, 2 of them since 2015, across 3 different models. The component owners most often filed it under: electrical system.

Manufacturer service bulletins that name P1235

5 technical service bulletins and manufacturer communications filed with NHTSA mention P1235, from 5 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • MITSUBISHI LANCER EVOLUTION (2008, 2009, 2010, 2011), bulletin 10173900: In cold weather, false MIL illumination may occur on some affected vehicles during turbocharger operation below 3,000 rpm engine speed, due to improper intake air volume judgement parameter. DTCs P1235 (2008-2010 vehicle…
  • SUBARU BRZ (2013), bulletin 10093943: REPROGRAMMING AVAILABILITY FOR DTC P1235 FALSE FAILURE INDICATION FOR HIGH-PRESSURE FUEL PUMP CIRCUIT
  • SCION FR-S (2013), bulletin 10133953: Some 2013 model year Scion FR-S vehicles may exhibit a MIL ?ON? condition with Diagnostic Trouble Code (DTC) P1235 (High Pressure Fuel Pump Circuit). The Engine Control Module/ECM (SAE term: Powertrain Control Module/PCM…
  • CHEVROLET F SERIES (2004, 2005), bulletin 10113006: This Preliminary Information communication provides information to the technician about vehicles that have Misfire, rough running, surge, chuggle, and possible Service Engine Soon Malfunction Indicator Lamp on. Technicia…
  • GMC G VAN BUS (2004, 2005), bulletin 10113006: This Preliminary Information communication provides information to the technician about vehicles that have Misfire, rough running, surge, chuggle, and possible Service Engine Soon Malfunction Indicator Lamp on. Technicia…

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.