C0523Multi-axis Acceleration Sensor Module B Intermittent/Erratic
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Module B sends values that jump or drop out now and then. No manufacturer publishes C0523, so limits and the identity of module B stay open. GM bulletins show that a separate multi-axis module is a networked unit of its own: on 2013 to 2014 Malibu, LaCrosse and Regal it logs U0121 in history at key-up because the brake module answers late, which GM calls normal, and on 2018 to 2020 Equinox and Terrain U0125 for a lost module is cured by brake controller software. Such communication codes are separate from C0523, which concerns erratic content. Bosch's SMI810 sends 16-bit SafeSPI frames, so contact faults appear as sporadic bad samples. Warnings may come and go.
- What you may notice
- Assistance or ESC warning comes and goes
- Code stored in history without current fault
- Jumping values from module B in live data
- Likely causes
- LikelyLoose or corroded connector or ground at module B
- PossibleSupply dips from a weak battery or poor connections
- RareSporadic internal fault in module B
- Repair
- Medium · Usually a job for a workshop.Typical cost: €60 – €1,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.