C1245 on Toyota: How to Diagnose & Fix
Manufacturer-specific chassis code - definition not established
1 Toyota model · 1 documented issue · 1 critical · $1,200-$3,000 repair
C1245 on Toyota by model: symptoms, diagnosis and fix
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.
Common Symptoms
- ABS, BRAKE, VSC and TRAC lights on together
- Loud continuous in-cabin warning alarm
- Brake pump motor runs constantly / electronic noise
- Hard or sinking brake pedal, reduced assist
- C-series ABS/brake control codes
How to Fix
First scan and inspect the wheel-speed (ABS) sensors and connectors, as dirty/damaged sensors mimic the symptoms cheaply. If the fault is the actuator/accumulator (continuous pump run, pressure faults), replace the integrated ABS actuator with master cylinder assembly - OEM 47050-60080/47050-60081 (4th gen) - and bleed/initialize the system with a capable scan tool. The part alone runs roughly $1,700-$2,300; remanufactured units are available cheaper.
Sources for this issue (2)
C1245 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does C1245 mean on a Toyota?
C1245 stands for "Manufacturer-specific chassis code - definition not established." C1245 is a manufacturer-specific chassis code, and available references disagree sharply on what it means. Different sources assign it to a Toyota acceleration/deceleration sensor output fault, a GM ABS valve coil circuit fault, and a Nissan outside air temperature sensor signal fault. No single definition could be confirmed against manufacturer service information, so it is not defined here. Look this code up in the service information for your specific make, model, and year before replacing any part. On Toyota it is documented across 1 model: 4Runner.
What are the most common causes of C1245?
The most common causes of C1245 are: Definition not established - do not diagnose from a generic definition, Check the manufacturer's own service information for this code, A sub-code or symptom byte (for example C1245-45) is often required to identify the exact fault. The specific cause varies by vehicle.
How much does it cost to fix C1245 on a Toyota?
Published repair estimates on Toyota range from $1,200 to $3,000 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for C1245 on a different make?
View C1245 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.