P3020critical severityPowertrain
CVT Belt/Chain Slip Detected
on 2019 Tesla Model 3 Long Range Dual Motor AWD · AWD
What this code means
The TCM detected excessive slip in the CVT belt or chain. The input and output shaft speed ratio does not match the commanded pulley ratio.
Symptoms
- Check Engine Light
- Transmission shudder
- RPM flare without acceleration
- Whining noise from transmission
- Reduced acceleration
- Limp mode activation
Common causes
- Worn CVT belt/chain
- Low CVT fluid level
- Degraded CVT fluid
- Worn pulleys
- CVT pressure solenoid failure
Diagnostic steps
- Check CVT fluid level and condition
- Monitor input vs output shaft speed
- Check line pressure with scan tool
- Inspect CVT fluid for metal contamination
- Test pressure control solenoids
Repair notes
CVT fluid replacement with OEM-specified fluid may resolve mild cases. Severe slip requires belt/chain and possibly pulley replacement.
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