C1391 on Toyota

Hybrid brake booster or actuator fault, internal brake fluid leak (Toyota, Lexus)

This page covers only what differs on Toyota. For what C1391 means, the ranked causes and the test order, see the C1391 guide.

What's different on Toyota

Toyota

  • 2004–2015 · Prius

    Supported by vehicle data

    Toyota bulletins list this code with the brake, ABS or TRAC lights on 2004–2009 Prius (internal leak in the brake actuator) and 2011–2015 Prius and Prius Plug-in (internal leak in the brake booster with master cylinder). The bulletins are on NHTSA, but whether they are still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Brake actuator (2004–2009) or brake booster with master cylinder (2011–2015)

  • 2006–2019 · Highlander

    Supported by vehicle data

    Toyota bulletins cover 2006–2007 Highlander HV and 2008–2019 Highlander Hybrid for an internal leak in the brake actuator, and Customer Support Program 24TE01 covers the brake booster and booster pump on certain 2014–2016 Highlander HV. Hybrid models only. The bulletins are on NHTSA, but whether they are still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Brake actuator or brake booster assembly

  • 2012–2018 · Prius V

    Supported by vehicle data

    Toyota bulletins cover 2012–2018 Prius v for an internal leak in the brake booster with master cylinder, and 24TE01 adds coverage for certain 2017 models. The bulletins are on NHTSA, but whether they are still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Brake booster assembly with master cylinder

  • 2012–2017 · Prius C

    Supported by vehicle data

    Toyota bulletins cover 2012–2014 Prius c (brake booster with master cylinder) and 2015–2017 Prius c (brake actuator). The bulletins are on NHTSA, but whether they are still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Brake booster with master cylinder or brake actuator

  • 2007–2014 · Camry

    Supported by vehicle data

    Hybrid models only: 2007–2011 Camry HV (brake actuator) and 2012–2014 Camry Hybrid (brake booster with master cylinder). The 2012–2014 bulletin also covers the 2013–2015 Avalon Hybrid. The bulletins are on NHTSA, but whether they are still current is not verified, so it is labelled vehicle data rather than confirmed.

    Where it is:Brake actuator or brake booster with master cylinder

  • T-SB-0032-16Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2004–2009prius, highlander · issued · NHTSA 10134400

    2004–2009 Prius and 2006–2007 Highlander HV. Repair procedure for a small internal brake fluid leak inside the brake actuator. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0064-19Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2008–2010highlander · issued · NHTSA 10161541

    2008–2010 Highlander Hybrid. Repair procedure for a small internal brake fluid leak inside the brake actuator. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0041-14Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2007–2011camry · issued · NHTSA 10132769

    2007–2011 Camry HV. Repair procedure for a small internal brake fluid leak inside the brake actuator. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0024-19Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2011–2015prius, prius-plug-in · issued · NHTSA 10158575

    2011–2015 Prius and 2012–2015 Prius Plug-in. Repair procedure for a small internal brake fluid leak inside the brake booster assembly with master cylinder. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0089-20Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2012–2014prius-v · issued · NHTSA 10181799

    2012–2014 Prius v. Repair procedure for a small internal brake fluid leak inside the brake booster assembly with master cylinder. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0115-20Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2015prius-v · issued · NHTSA 10184562

    2015 Prius v. Repair procedure for a small internal brake fluid leak inside the brake booster assembly with master cylinder. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0013-23Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2016–2018prius-v · issued · NHTSA 10234318

    2016–2018 Prius v. A small brake fluid leak inside the brake booster assembly with master cylinder. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0028-21Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2012–2014prius-c · issued · NHTSA 10198129

    2012–2014 Prius c. Repair procedure for a small internal brake fluid leak inside the brake booster assembly with master cylinder. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB000824Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2015–2017prius-c · issued · NHTSA 10252260

    2015–2017 Prius c. Repair procedure for a small internal brake fluid leak inside the brake actuator. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • TSB000924Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2014–2016highlander · issued · NHTSA 10252261

    2014–2016 Highlander Hybrid. Repair procedure for a small internal brake fluid leak inside the brake actuator. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0014-25Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2017–2019highlander · issued · NHTSA 11014208

    2017–2019 Highlander Hybrid. A small internal brake fluid leak inside the brake actuator. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • T-SB-0130-19Status unverified

    Brake, ABS and/or TRAC lights or Check VSC with C1391, C1252, C1253 or C1256

    2012–2015camry, avalon · issued · NHTSA 10165988

    2012–2014 Camry Hybrid and 2013–2015 Avalon Hybrid. Repair procedure for a small internal brake fluid leak inside the brake booster assembly with master cylinder. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

  • 24TE01Status unverified

    Customer Support Program: brake booster and brake booster pump assemblies

    2014–2017highlander, prius-v · issued · NHTSA 11011632

    Extra coverage for internal brake booster faults on certain 2014–2016 Highlander HV and 2017 Prius v, verified by C1391, C1252, C1253 or C1256. Repair is a new brake booster and booster pump. Primary coverage ended March 31, 2025; secondary coverage runs 10 years or 150,000 miles from first use. Only the NHTSA flat-file summary was reviewed, not the bulletin itself.

    We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Sources and review

  1. Toyota T-SB-0032-16: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Prius, Highlander HV) — Toyota Motor Sales / NHTSA ,
  2. Toyota T-SB-0024-19: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Prius, Prius Plug-in) — Toyota Motor Sales / NHTSA ,
  3. Small Brake Fluid Leak for Toyota — VehicleServicePros (information courtesy of Mitchell 1) ,
  4. Toyota T-SB-0064-19: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Highlander Hybrid) — Toyota Motor Sales / NHTSA ,
  5. Toyota TSB000924: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Highlander Hybrid) — Toyota Motor Sales / NHTSA ,
  6. Toyota T-SB-0014-25: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Highlander Hybrid) — Toyota Motor Sales / NHTSA ,
  7. Toyota Customer Support Program 24TE01: brake booster and brake booster pump assemblies — Toyota Motor Sales / NHTSA ,
  8. Toyota T-SB-0089-20: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Prius v) — Toyota Motor Sales / NHTSA ,
  9. Toyota T-SB-0115-20: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (2015 Prius v) — Toyota Motor Sales / NHTSA ,
  10. Toyota T-SB-0013-23: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Prius v) — Toyota Motor Sales / NHTSA ,
  11. Toyota T-SB-0028-21: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Prius c) — Toyota Motor Sales / NHTSA ,
  12. Toyota TSB000824: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Prius c) — Toyota Motor Sales / NHTSA ,
  13. Toyota T-SB-0041-14: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Camry HV) — Toyota Motor Sales / NHTSA ,
  14. Toyota T-SB-0130-19: brake, ABS, TRAC lights or Check VSC with C1391/C1252/C1253/C1256 (Camry Hybrid, Avalon Hybrid) — Toyota Motor Sales / NHTSA ,
  15. Toyota Camry Owner's Manual (OM06291U) — Toyota
Last reviewed
Written by
Saurabh K.
Editorial review
Pending
Technician review
Technician review pending

This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error

My Car

Pick your car and code pages will point out notes and bulletins for it. Saved only in this browser.

Fill this in from your VIN

Used once to identify your engine; not stored.