U0121
Lost Communication with ABS Module
1998-1998 Aston Martin DB7 3.2L I6 Supercharged 🇨🇦
High SeverityNetwork
Description
Cannot communicate with the Anti-lock Brake System module.
Symptoms
- ABS light on
- Traction control disabled
- Stability control disabled
Common Causes
- ABS module power failure
- CAN bus wiring
- ABS module failure
- Fuse blown
Diagnostic Steps
- Check ABS fuses
- Test module power and ground
- Check CAN wiring
- Try direct communication
Repair Notes
Check fuses first. Common on water-damaged vehicles.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0121 on Other Vehicles
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2016-2016 4.0L V8 Twin Turbo
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2016-2016 5.2L V12 Twin Turbo
Aston Martin DB11
2017-2017 4.0L V8 Twin Turbo
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2017-2017 5.2L V12 Twin Turbo
Aston Martin DB11
2018-2018 4.0L V8 Twin Turbo
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2018-2018 5.2L V12 Twin Turbo
Aston Martin DB11
2019-2019 4.0L V8 Twin Turbo
Aston Martin DB11
2019-2019 5.2L V12 Twin Turbo
Common Questions
What does code U0121 mean on a 1998-1998 Aston Martin DB7?
U0121 stands for "Lost Communication with ABS Module". Cannot communicate with the Anti-lock Brake System module.
What are the symptoms of U0121 on a Aston Martin DB7?
Common symptoms of U0121 include: ABS light on, Traction control disabled, Stability control disabled.
What causes U0121 on a 1998-1998 Aston Martin DB7?
Common causes of U0121 include: ABS module power failure, CAN bus wiring, ABS module failure, Fuse blown.