P0340: 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 P0340 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

79 complaints filed with NHTSA mention P0340, 47 of them since 2015, across 44 different models. The component owners most often filed it under: engine.

Most-reported models

VehicleComplaintsModel years reported
NISSAN ALTIMA62003, 2004, 2006, 2016
NISSAN MURANO62003, 2007
NISSAN MAXIMA52003
INFINITI G3552003, 2004
NISSAN 350Z42003
INFINITI I3532003, 2004
MERCEDES-BENZ C25032012, 2013
FORD ECOSPORT32018, 2020

Manufacturer service bulletins that name P0340

121 technical service bulletins and manufacturer communications filed with NHTSA mention P0340, from 18 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • FORD ESCAPE (2020, 2021), bulletin 10201593: Some 2020-2021 Escape vehicles may exhibit a loss of voltage reference (VREF) or runs rough, blow fuse 44 and may or may not set DTC's P06A7,P0840,P0842,P0845,P0847,P2122,P2127,P0522,P008A,P06A6,P2196,P0192, P0212,P0340,…
  • CHRYSLER PACIFICA (2021), bulletin 10212398: Flash: Powertrain Control Module (PCM) Updates This bulletin involves updating the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigat…
  • CHRYSLER PACIFICA PLUG-IN HYBRID (2021), bulletin 10223177: Flash: Powertrain Control Module (PCM) Updates This bulletin involves updating the PCM with the latest available software. Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigat…
  • CADILLAC ESCALADE (2020), bulletin 10174855: This Preliminary information communicatesThe vehicle may have an SES lamp with any of the following DTCP06DA, P06DB, P06DC, P250A, P0300, P0340, P0341, P0335, P0336, P0641, P0011, P0010, P2088, P2089, and/or P2230. Possi…
  • CHEVROLET CAMARO (2020), bulletin 10174855: This Preliminary information communicatesThe vehicle may have an SES lamp with any of the following DTCP06DA, P06DB, P06DC, P250A, P0300, P0340, P0341, P0335, P0336, P0641, P0011, P0010, P2088, P2089, and/or P2230. Possi…
  • GMC SIERRA 1500 (2020), bulletin 10174855: This Preliminary information communicatesThe vehicle may have an SES lamp with any of the following DTCP06DA, P06DB, P06DC, P250A, P0300, P0340, P0341, P0335, P0336, P0641, P0011, P0010, P2088, P2089, and/or P2230. Possi…

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.