C1203No valid communication with the engine computer
- Toyota/Lexus code · ABS / stability control
- Lights a warning lamp
- How the car detects it
- The skid control unit doesn't get the data it expects from the engine computer over the CAN network. While this fault is stored, the skid control unit may switch off VSC (stability control) and traction control, and sometimes ABS; normal braking still works. Drive gently and have it checked.
- What you may notice
- VSC / slip indicator or ABS warning light
- Likely causes
- PossibleCAN wiring or connectors
- RareEngine computer, or a wrong computer fitted after a replacement
- Sources
Backed by at least two independent sources.
From Obdaryn's Toyota/Lexus pack, exactly as the app shows it, with the public sources above. Guidance only; confirm with a workshop.