EPS Control Module Voltage Low
2004-2016 Aston Martin DB9 6.0L V12
Description
The EPS module supply voltage has dropped below the minimum operating threshold.
Symptoms
- EPS warning light
- Power steering assist reduced
- Assist cuts out during electrical load
- Steering heavy at idle with AC on
Common Causes
- Low battery voltage
- Weak alternator
- High resistance in EPS power supply wiring
- Corroded battery terminals
- Undersized wiring for EPS current demand
Diagnostic Steps
- Measure battery voltage at rest and running
- Test alternator output under load
- Check voltage at EPS module connector
- Inspect battery terminals and cable ends
- Test EPS power supply fuse and connections
Repair Notes
Repair charging system. Clean battery connections. Verify adequate wire gauge to EPS module.
Related Codes
Other Chassis Codes
- C0021LF Wheel Speed Sensor Range/Performance
- C0022RF Wheel Speed Sensor Range/Performance
- C0023LR Wheel Speed Sensor Range/Performance
- C0024RR Wheel Speed Sensor Range/Performance
- C0025LF Wheel Speed Sensor Circuit Intermittent
- C0026RF Wheel Speed Sensor Circuit Intermittent
- C0027LR Wheel Speed Sensor Circuit Intermittent
- C0028RR Wheel Speed Sensor Circuit Intermittent
- C0035Left Front Wheel Speed Sensor Circuit
- C0036Left Front Wheel Speed Signal Erratic
C0221 on Other Vehicles
Aston Martin DB11
2016-2024 4.0L V8 Twin Turbo
Aston Martin DB11
2016-2024 5.2L V12 Twin Turbo
Aston Martin DB7
1994-2003 3.2L I6 Supercharged
Aston Martin DBS Superleggera
2019-2024 5.2L V12 Twin Turbo
Aston Martin DBX
2020-2024 4.0L V8 Twin Turbo
Aston Martin Vantage
2005-2024 4.7L V8
Aston Martin Vantage
2018-2024 4.0L V8 Twin Turbo
Common Questions
What does code C0221 mean on a 2004-2016 Aston Martin DB9?
C0221 stands for "EPS Control Module Voltage Low". The EPS module supply voltage has dropped below the minimum operating threshold.
What are the symptoms of C0221 on a Aston Martin DB9?
Common symptoms of C0221 include: EPS warning light, Power steering assist reduced, Assist cuts out during electrical load, Steering heavy at idle with AC on.
What causes C0221 on a 2004-2016 Aston Martin DB9?
Common causes of C0221 include: Low battery voltage, Weak alternator, High resistance in EPS power supply wiring, Corroded battery terminals, Undersized wiring for EPS current demand.