C1223 — 7 documented meanings by make
Documented by: CHEVROLET (USA), CHRYSLER, FORD, MAZDA, MITSUBISHI, SUZUKI, TOYOTA — the meaning can differ between manufacturers
C1223 does not mean the same thing on every car — manufacturers reuse the number for different faults. 7 makes document it: Chevrolet (USA), Chrysler, Ford, Mazda, Mitsubishi, Suzuki, Toyota. Find your make below.
| Make | Documented meaning | Points at |
|---|---|---|
| Chevrolet (USA) | Rear left wheel speed sensor input signal is 0 | ABS / wheel speed |
| Chrysler | Brake pedal travel sensor supply circuit | |
| Ford | Brake warning lamp output circuit | lighting circuit |
| Ford | Front left wheel speed sensor signal missing | ABS / wheel speed |
| Mazda | Brake warning lamp output circuit | lighting circuit |
| Mitsubishi | Suspension of sensor active check | |
| Suzuki | Transfer shift actuator motor position switch 1, open circuit | transmission · open circuit |
| Toyota | ABS control system | ABS / wheel speed |
C1223 on Chevrolet (USA)
On Chevrolet (USA) vehicles C1223 is documented as: Rear left wheel speed sensor input signal is 0. C1223 points at ABS / wheel speed (rear left). The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Chevrolet (USA) codes:
C1223 on Ford
On Ford vehicles C1223 is documented as: Brake warning lamp output circuit; Front left wheel speed sensor signal missing. C1223 points at lighting circuit. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Ford codes:
C1223 on Mazda
On Mazda vehicles C1223 is documented as: Brake warning lamp output circuit. C1223 points at lighting circuit. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Mazda codes:
C1223 on Suzuki
On Suzuki vehicles C1223 is documented as: Transfer shift actuator motor position switch 1, open circuit. C1223 is stored when the ECU sees open circuit on transmission. That describes how the circuit is behaving, not which part has failed — the wiring, the connector and the component itself can all produce it, which is why the checks below start with the cheapest.
Usually one of: Broken wire, most often at a flex point such as a door hinge or engine mount; Corroded or pushed-back terminal in the connector; Blown fuse on the supply side; Component failed with an internally open winding or element.
Check first, cheapest first:
- Check the relevant fuse first — it is the cheapest thing that produces this code
- Unplug and inspect both halves of the connector for corrosion and terminal fit
- Continuity-test the wire end to end while flexing the loom by hand
- Measure the component itself against its specification
- Repair the break or replace the component, whichever the measurement points to
Related Suzuki codes:
C1223 on Toyota
On Toyota vehicles C1223 is documented as: ABS control system. C1223 points at ABS / wheel speed. The standard definition names the system involved; which part inside it has actually failed is what the checks below establish, cheapest first.
Related Toyota codes:
Which one is yours
A generic OBD reader gives you the number, not which of these meanings your manufacturer assigned to it. To get to the specific one:
- Use a brand-specific scanner — VCDS for VAG, INPA or ISTA for BMW, XENTRY for Mercedes, Forscan for Ford. It shows the manufacturer's own text rather than the generic one.
- Read all stored codes together — the neighbouring ones usually point at which system is involved and narrow the list.
- Check freeze-frame data: the RPM, temperature and load at the moment it triggered indicate which system was active.
- If you have no brand scanner, tell me the make and model below and I will tell you which of these applies to your car.
Code family
C1xxx is suspension, steering, active systems.
Severity
Suspension or steering — on active systems (ESP, air suspension) the code usually comes from a sensor, not the part itself.
That is what holds for C1223 in general. From here it depends on your engine — tell me which car it is and what it does, and I will give you the steps for it: real procedures, torque figures and diagrams instead of general advice.
Why TorqFix for your car?
Above is what the code means and why it appears. TorqFix goes further — it gives you specific procedures, torque values, wiring diagrams and pinouts for your exact engine, not generic steps for every car. Real workshop data (127,000+ diagrams, 10,000+ procedures), interpreted by AI in your language.
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Code breakdown
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
The same code can mean different things on different makes. Match the meaning to your make before acting on it.
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