C1391 — OBD-II trouble code

A chassis OBD-II trouble code. Below are the vehicles and failure patterns where owners report it, drawn from NHTSA complaints.

In ProblemsByVin's analysis of the NHTSA owner-complaint record, owners cite C1391 across 34 vehicle failure patterns. Diagnostic codes in complaints are reported by owners and are unverified — they point to where this code shows up, not a confirmed diagnosis. Open a page below for the full pattern (symptoms, mileage, repair costs owners cite).

Vehicles where owners report C1391 34 patterns

2015 Toyota Prius

brakes — Brake booster and master cylinder failure

2015 Toyota Prius

electrical — Brake booster failure

2014 Toyota Prius

brakes — Brake booster/accumulator pressure loss

2014 Toyota Prius

electrical — Hybrid System Power Loss / Inverter Failure

2014 Toyota Prius V

brakes — Brake booster and brake booster pump assembly failure (C1391)

2014 Toyota Prius

cruise control — Brake booster pump assembly failure causing unintended acceleration

2013 Toyota Prius

brakes — Brake Booster and Accumulator Assembly Leak (C1391)

2013 Toyota Prius V

brakes — Brake Booster and ABS Pump Assembly Failure – Loss of Braking Power

2013 Toyota Prius

electrical — Brake booster and master cylinder assembly failure

2013 Toyota Camry

brakes — Complete brake failure or severe loss of braking effectiveness

2013 Toyota Prius C

brakes — Brake booster pump and accumulator failure

2013 Toyota Highlander

brakes — ABS module internal leak and failure

2012 Toyota Prius

electrical — Brake actuator/accumulator failure

2012 Toyota Prius

brakes — Brake Booster and Accumulator Internal Leak / Failure

2012 Toyota Prius

cruise control — Brake, ABS, and stability control warning lights with soft brakes

2011 Toyota Prius

brakes — Brake booster pump failure — loss of power assist

2011 Toyota Prius

electrical — Check hybrid system warning - limp mode and short trip failures

2011 Toyota Highlander

brakes — Complete brake failure with unintended acceleration

2010 Toyota Prius

brakes — Brake booster pump assembly and accumulator failure

2010 Toyota Prius

electrical — Brake booster / master cylinder / ABS accumulator failure

2010 Toyota Prius

cruise control — Unintended acceleration when braking on bumps/potholes

2010 Toyota Highlander

brakes — Brake Actuator Assembly & Brake Booster Pump Assembly Failure (Hybrid Models)

2009 Toyota Highlander

brakes — ABS Actuator and Brake Booster Pump Assembly Internal Leak

2008 Toyota Camry

cruise control — Brake system failure with CHECK VSC warning

2008 Toyota Highlander

brakes — Brake actuator assembly failure with internal fluid leak

2008 Toyota Prius

brakes — Brake actuator failure with pressure loss

2008 Toyota Highlander

electrical — Brake Actuator and ABS System Failures

2007 Toyota Camry

cruise control — ABS/VSC actuator failure (primarily hybrid models)

2007 Toyota Camry

brakes — Brake Actuator Assembly Failure

2006 Toyota Prius

brakes — Intermittent total brake loss on low-speed stops and light braking

2006 Toyota Highlander

brakes — ABS Actuator Assembly Failure

2006 Toyota Highlander

cruise control — Brake system: VSC, ABS, and brake lights illuminated; brake actuator/ABS module failure

2006 Toyota Highlander

powertrain — Complete brake system failure (loss of brake pressure)

2005 Toyota Prius

brakes — Brake failure / complete loss of braking power

Codes are pulled from what owners wrote in their NHTSA filings — they're allegations, not a shop diagnosis. Always confirm with a live scan. Browse all diagnostic codes →