C1223 code in owner complaints

Code C1223 is named in 28 US owner complaints, 1 of them (4%) after a crash. Models: 7, model years 2000–2021.

There is little data for this code or its meaning is ambiguous, so this page is not indexed.

What the code means

This is a manufacturer-specific code: the meaning depends on the make and sometimes on the year.

How to read C1223: the letter C means chassis (brakes, ABS, steering, suspension); the second digit 1 marks a manufacturer code whose meaning is set by the make; the last three characters 223 identify the specific fault.

ABS/ESC codes: wheel speed sensors, the ABS hydraulic unit and pump, brake booster, pressure and yaw sensors. A hit to a wheel or suspension often damages the wheel speed sensor or its wiring, so on a damaged car this code is a reason to inspect the hub, knuckle and control arms, not just swap the sensor.

Key figures

Complaints with this code: 28
after a crash: 1 (4%)
Models: 7
Model years: 2000–2021

Which models and years

Models whose owners name this code (7). Years link to the model year problems page.

Model	Years	Complaints
Toyota Sequoia	2003, 2004, 2005, 2006	18
Toyota 4runner	2004, 2006	3
Toyota Land Cruiser	2000, 2005	2
Toyota RAV4	2007, 2008	2
Lexus RX330	2005	1
RAM Promaster	2021	1
Toyota Sequoia SR5	2003	1

Components named together with the code

Component as the owner filed it (one complaint can list several).

Service brakes 22
Electronic stability control 8
Vehicle speed control 8
Electrical system 3
Powertrain 2
Steering 2
Other 2
Air bags 1

Complaints by model year

2000 1
2003 10
2004 6
2005 5
2006 3
2007 1
2008 1
2021 1

What to do if an auction car has this code

Inspect the wheel and suspension on the impact side: the wheel speed sensor is often damaged together with the hub or knuckle.
Check whether the ABS and ESC lights stay on after start-up.
After replacing sensors or the hydraulic unit, bleeding and scan tool adaptation may be required.

What owners report

Excerpts of owner complaints in the original wording. Owner statements not verified by the regulator; personal data removed.

8.) drove 4runner approximately 10-11 miles, hit brakes, brakes failed, abs and brake light on, warning/buzzer sound, crash - no fatalities. 9.) codes from dealer C1223, C1251, C1256; brake fluid level good. 10.) dealer replaced abs and master cylinder. $3,356 repair cost.
Toyota 4runner 2004 · 2014-05 · crash
Had to use emergency brake for stopping. Dealer found the following codes: C1223, C1251, C1252 AND C1256. ABS CONTROL SYSTEM MALFUNCTION, PUMP MOTOR IS LOCKED/OPEN CIRCUIT IN PUMP MOTOR GROUND. Hydraulic brake booster assembly was replaced with a new OEM unit and brakes now work as they should.
Toyota Land Cruiser 2005 · 2024-02
When driving the back light an traction control light come in brake light stays on an it says codes C1203 C1223 C1247 also saying the abs sensor on master cylinder open circuit also has a code fro 0dtc had it checked out on 7/1/2019
Toyota Sequoia SR5 2003 · 2019-07

Related codes

Sources: public official US data (owner complaints) and the SAE J2012 standard. Complaints are owner statements not verified by the regulator. A code from a complaint does not replace a scan tool diagnosis. Data updated 2026-11-10.