C1256 on Toyota
Manufacturer-Specific Chassis Code (commonly ABS/Brake Pressure or Wheel Circuit)
C1256 on Toyota vehicles indicates manufacturer-specific chassis code (commonly abs/brake pressure or wheel circuit). Au7o has documented this code across 3 Toyota models — most commonly on 4Runner, Camry, Highlander. C1256 is a manufacturer-specific chassis code whose exact meaning varies by automaker, typically within the ABS, traction control, or brake hydraulic system. It generally indicates the ABS/stability control module detected an abnormal signal or circuit fault for a pressure sensor, solenoid, or wheel circuit. Since it involves braking/stability systems, warning lamps usually light and the affected function can be temporarily limited. Confirm the specific component with make-specific service information before replacing parts. Typical repair costs on Toyota range from $1,200 to $3,500, depending on the specific model and root cause.
Common Causes of C1256
- •Faulty brake/ABS pressure or wheel speed sensor
- •Damaged or corroded wiring/connector in the ABS circuit
- •Open or short in the affected sensor/solenoid circuit
- •Failing ABS/EBCM control module
- •Low system voltage or poor ground
- •Hydraulic modulator internal fault
C1256 on Toyota by Model
Toyota 4Runner(2 issues)
- ABS Actuator / Master Cylinder Assembly Failure Triggering ABS/VSC/TRAC Lights and Brake Pump Noise2003-2009
On 4th-gen 4Runners the integrated ABS actuator/brake master cylinder assembly (with electric pump motor and accumulator) fails internally. The pump motor or accumulator wears out so the pump never reaches pressure and runs continuously; owners get simultaneous ABS, BRAKE, VSC and TRAC warning lights, a loud continuous in-cabin alarm, electronic noise when braking, and a hard or sinking pedal with reduced assist. It is a safety-relevant failure and the assembly is one of the most expensive non-drivetrain parts on the truck. This is distinct from the brake booster/master-cylinder internal-leak issue: this is the ABS hydraulic actuator/accumulator unit.
- Brake Booster / Master Cylinder Internal Leak Causing Hard Pedal and Reduced Braking Assist2003-2009
Multiple 4th-generation 4Runner owners report the brake pedal becoming hard, requiring excessive effort to stop, often accompanied by ABS/VSC/TRAC warning lights and a buzzing or continuously running brake actuator. Toyota issued service information for brake booster pump/master cylinder concerns on related platforms, and owner complaints frequently describe internal accumulator or actuator failure rather than simple pad/rotor wear. Repairs are expensive because the booster/master/actuator assembly is typically replaced as a unit.
Toyota Camry(1 issue)
- Camry Hybrid Brake-Booster Internal Leak - T-SB-0130-19 / CSP ZKK2012-2014
Toyota T-SB-0130-19 and Customer Support Program ZKK apply to certain 2012-2014 Camry Hybrid vehicles with brake, ABS and/or TRAC warning lights or a Check VSC message. Verification requires C1391, C1252, C1256 or C1253. Toyota attributes the specified condition to a small internal brake-fluid leak in the brake-booster assembly with master cylinder. Warning lamps can have other causes, and the documents do not support extending this record to gasoline Camrys or other model years. ZKK's primary coverage ended March 31, 2021; its secondary coverage was 10 years or 150,000 miles from first use, so its published coverage period has expired for this model-year range as of 2026.
Toyota Highlander(1 issue)
- Hybrid Brake Booster / ABS Actuator Assembly Failure (Accumulator Leak) — C13912006-2013
The regenerative-braking brake actuator (the integrated ABS/booster/accumulator pump module) is a known weak spot on the Highlander Hybrid. The accumulator develops an internal leak and the pump runs constantly, triggering a loud, repetitive whirring/buzzing and warning lights; in some cases brake assist is reduced, which owners describe as a serious safety concern (the same family of actuators drove early Prius brake recalls). CarComplaints documents repeated brake actuator complaints on the 2006 Highlander Hybrid, and the repair is rarely covered out of warranty.
Looking for C1256 on a different make?
View C1256 across all makes →Frequently Asked Questions
What does C1256 mean on Toyota?▼
C1256 stands for "Manufacturer-Specific Chassis Code (commonly ABS/Brake Pressure or Wheel Circuit)." C1256 is a manufacturer-specific chassis code whose exact meaning varies by automaker, typically within the ABS, traction control, or brake hydraulic system. It generally indicates the ABS/stability control module detected an abnormal signal or circuit fault for a pressure sensor, solenoid, or wheel circuit. Since it involves braking/stability systems, warning lamps usually light and the affected function can be temporarily limited. Confirm the specific component with make-specific service information before replacing parts. On Toyota specifically, this code is documented across 3 models.
What causes C1256 on Toyota vehicles?▼
Common causes on Toyota: Faulty brake/ABS pressure or wheel speed sensor, Damaged or corroded wiring/connector in the ABS circuit, Open or short in the affected sensor/solenoid circuit, Failing ABS/EBCM control module, Low system voltage or poor ground. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C1256 on a Toyota?▼
Repair costs on Toyota range from $1,200 to $3,500, depending on the specific model and root cause.
Which Toyota models have C1256 documented?▼
Au7o has documented C1256 on 3 Toyota models: 4Runner, Camry, Highlander.