Back to 2021 Tesla Model S
Help
2021 TESLA MODEL S
Performance Dual Motor AWD•AWD•AUTOMATIC•ev
24 active safety recalls on this vehicle — view recalls
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor327Torque3092Fluid5DTC726Battery1Maintenance0Recalls24
P3044critical severityPowertrain

DCT Gearshift Actuator Drum Position Error

on 2021 Tesla Model S Performance Dual Motor AWD · AWD

What this code means

The gear selector drum actuator in the DCT is not achieving the correct position for the requested gear.

Symptoms

  • Check Engine Light
  • Failure to select requested gear
  • Neutral between shifts
  • Grinding during gear changes
  • Transmission stuck in one gear
  • Complete loss of drive

Common causes

  • Gear selector drum actuator failure
  • Position sensor malfunction
  • Mechanical obstruction in drum
  • Hydraulic pressure loss
  • Synchronizer ring damage

Diagnostic steps

  1. Read gear drum position PID
  2. Command gear selection and monitor response
  3. Check hydraulic pressure at actuator
  4. Inspect selector drum position sensor
  5. Listen for mechanical noise during shifts

Repair notes

Replace gear selector drum actuator or repair hydraulic system. May require transmission removal for synchronizer inspection.

🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITE
Shop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Other Powertrain codes on this vehicle

🔌 Need this data in your app? It's all in the free API →
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
Stuck on this repair? Take it to The Diag Desk — ask a master tech about this exact car → real human answer within 24h, never AI
Share:XRedditFBWhatsAppThreadsEmail
⚠ STILL BEHIND THE PAYWALL
The 2021 Tesla Model S repair data is incomplete because no one has sponsored it yet. For $99, we generate the full step-by-step procedures, then fact-check them with a second AI pass and your expert review. Your name on every procedure, permanently.
The same data would cost $169/mo from Mitchell1 or $30/year from ALLDATAdiy — and you'd be renting access, not freeing it. Sponsor once, free forever.
Sponsor the Tesla Model S — $99 →
Building an app?
Free API access to all this data — 10 requests/day, no card required.
Get an API key →
Run a shop?
Manage repairs, estimates, and customers with ShopBase — $249/mo, all features included.
Try ShopBase →