C1256
ABS / stability-control fault code, listed for 1 vehicle line from Toyota. What it means on each one, with sources, and when the module is the cause.
What C1256 means
Listed in T-SB-0032-16; an owners’ forum describes it as accumulator low pressure
On: 2004-2009 Toyota Prius (XW20, Gen 2)
Is it the ABS module?
Check the cheap things first: battery voltage and the main fuses for the ABS pump and module, the ground straps, the module connector (corrosion, a pushed-back pin) and, for wheel-speed codes, the sensor and its wiring at each wheel. If those are good and the code returns as soon as it is cleared — or the scan tool cannot talk to the ABS module at all — the module itself is the likely cause, and that is what we repair.
Vehicles that set C1256
C1256 by vehicle
What does C1256 mean on a Toyota Prius (XW20, Gen 2)?
The source we cite for the 2004-2009 Toyota Prius (XW20, Gen 2) lists it as: Listed in T-SB-0032-16; an owners’ forum describes it as accumulator low pressure. That vehicle uses HYBRID brake actuator (high-pressure accumulator + pump, electronically controlled braking) - not a conventional ABS mod. We repair it as part of the Hybrid brake actuator (brake booster with pump) family, quote.
Still not sure?
Send us C1256, a photo of the module label and your VIN — we tell you whether the module is the likely cause and what it costs, before you pull anything. Asking costs nothing.
C1256 keeps coming back after the checks? Fix the module — from $499.
Look up your part number and order online — we email you a prepaid label to our lab. Or send us a photo of the label and your VIN first, and we'll tell you what you have and what it costs.
Back with your VIN and coding · can’t be repaired? repair price back, minus shipping · 1-year warranty · rush 2–3 days +$100
Call (817) 505-4201 · 📱 Text us a photo of the module label · Ask first — send a label photo · Email repairs@absmodulelab.com