di_a166
Moderate
Tesla · Sedans
Cruise control disabled - speed sensor fault
Quick Answer
Error code DI_a166 on your Tesla Sedans means: Cruise control disabled - speed sensor fault. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Inspect wheel speed sensor connectors at each wheel for corrosion
2
Check for visible damage to speed sensor wiring harness
3
Clean radar sensor dome of dirt, snow, or ice buildup
4
Perform system reset by cycling vehicle power multiple times
5
If unresolved, schedule service for speed sensor replacement or radar module calibration
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Speed sensor replacement kit
Connector repair kit with dielectric grease
Radar alignment and calibration tool
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