P1133: 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 P1133 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 P1133, across 3 different models. The component owners most often filed it under: engine and engine cooling:engine.

Manufacturer service bulletins that name P1133

4 technical service bulletins and manufacturer communications filed with NHTSA mention P1133, from 3 makes. A bulletin means the manufacturer has documented a known cause or a fix procedure for that model. Examples:

  • CHEVROLET MALIBU (2018), bulletin 10137161: 18009 - Service Update. The bootloader version for the engine control module (ECM) was incorrectly released, and may result in a no-start or stall, and P062B, P0171/P0172, P1133/P2195/P2196 or P300 diagnostic trouble cod…
  • CADILLAC CTS (2009, 2010, 2011, 2012), bulletin 10112839: This Preliminary Information communication provides information to the technician about vehicles that have Service Stabilitrak Message being displayed in the driver?s information center. Technician may find Diagnostic Tr…
  • GMC TERRAIN (2010), bulletin 10081021: THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON THE STEPS ON HOW TO DIAGNOSE AND REPAIR VEHICLES WITH SERVICE ENGINE SOON OR DIAGNOSTIC TROUBLE CODE P0133 OR P1133. CHECK FOR THE POST…
  • CHEVROLET EQUINOX (2010), bulletin 10081021: THIS PRELIMINARY INFORMATION COMMUNICATION PROVIDES INFORMATION TO THE TECHNICIAN ON THE STEPS ON HOW TO DIAGNOSE AND REPAIR VEHICLES WITH SERVICE ENGINE SOON OR DIAGNOSTIC TROUBLE CODE P0133 OR P1133. CHECK FOR THE POST…

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.