U0133moderate severityNetwork
Lost Communication with Suspension Control Module A
on 2014 Ram 2500 6.7L I6 Cummins Diesel · 4WD
What this code means
Cannot communicate with the primary suspension control module for adaptive or active suspension.
Symptoms
- Suspension warning light
- Ride quality degraded
- Dampers in default mode
- Sport/comfort mode not available
Common causes
- Suspension module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Damper solenoid wiring issue
Diagnostic steps
- Check suspension module fuse
- Test power and ground
- Check CAN wiring
- Test damper solenoids
- Scan for suspension DTCs
Repair notes
Active suspension defaults to firm setting when module communication is lost. Check fuses first.
🔌 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