Back to 2024 Volvo EX30
Help
2024 VOLVO EX30
Single Motor RWD•RWD•AUTOMATIC•ev
Founding sponsor spot is openYour name on every procedure for this vehicle, permanently.Sponsor — $99 →
Repairs0Labor318Torque4466Fluid5DTC738Battery1Maintenance0Recalls0
P1618high severityPowertrain

TCM-ECM Communication Fault

on 2024 Volvo EX30 Single Motor RWD · RWD

What this code means

The ECM detected a communication fault with the Transmission Control Module (TCM). The CAN bus communication between the engine and transmission controllers is disrupted or unreliable.

Symptoms

  • Check Engine Light
  • Transmission may enter limp mode
  • Harsh or incorrect shifting
  • Transmission warning light
  • Reduced power

Common causes

  • CAN bus wiring fault between ECM and TCM
  • TCM failure
  • ECM CAN driver failure
  • Corroded CAN connector
  • CAN bus termination resistor fault

Diagnostic steps

  1. Check CAN bus communication with diagnostic tool
  2. Test CAN High and CAN Low signals
  3. Inspect CAN bus wiring between ECM and TCM
  4. Test CAN termination resistance
  5. Check TCM power and ground

Repair notes

Repair CAN bus wiring or replace the faulty module (ECM or TCM).

🔌 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 2024 Volvo EX30 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 Volvo EX30 — $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 →