C1223 Code: Brake Warning Lamp Output Circuit Failure
🟢 Low severity · drivable
Safe to drive, but the brake warning lamp may not work, so check brake function manually.
What C1223 means
The circuit that drives the brake warning lamp has a fault, so the lamp may not illuminate when it should.
Symptoms
- Brake warning lamp not working or stuck on
- ABS warning light on
- No driving symptoms
Common causes
- most common: Faulty brake warning lamp or bulb
- common: Damaged wiring in the lamp circuit
- less common: Faulty ABS/brake control module
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Check the lamp bulb and replace if burnt out | Yes | $5–20 |
| Repair damaged lamp wiring | Mechanic | $50–150 |
Frequently asked questions
Can I drive with a C1223 code?
Yes. It only affects the brake warning lamp, but check your brakes work normally.
What is the most common cause of C1223?
A faulty brake warning lamp or damaged wiring.
How much does it cost to fix a C1223?
$5–$20 for a bulb, or $50–$150 for wiring.
Related codes
C1224
C1224 Code: Brake Warning Lamp Output Circuit Open
C1225C1225 Code: Brake Warning Lamp Output Circuit Short to Battery
C1226C1226 Code: Brake Warning Lamp Output Circuit Short to Ground
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.