U1064high severityNetwork
Lost Communication with VSA Modulator-Control Unit
on 2011 Acura RL 3.7L V6 · AWD
What this code means
The vehicle has lost communication with the VSA (stability/ABS) modulator-control unit over the CAN bus. Equivalent to generic code U0121.
Symptoms
- ABS and VSA warning lights on
- Stability control disabled
- Brake system warning present
Common causes
- Faulty VSA unit wiring or connector
- Failed VSA modulator-control unit
- Blown VSA fuse
- CAN bus fault
Diagnostic steps
- Scan for VSA and network codes
- Check VSA unit power and ground
- Test CAN wiring to VSA unit
- Inspect connectors and test the modulator unit
🔌 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 FAVORITEShop-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 Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus