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C0000 – Vehicle Speed Information Circuit Malfunction | EPS Module Fault
What Does C0000 Mean?
C0000 – Vehicle Speed Information Circuit Malfunction is a diagnostic trouble code that indicates the Electric Power Steering (EPS) Control Module is not receiving correct vehicle speed information or has detected a communication fault within the speed signal circuit.
Modern Electric Power Steering systems rely on vehicle speed data from the Engine Control Module (ECM), ABS Module, or CAN Bus network to adjust steering assistance. If this information is missing, incorrect, or interrupted, the EPS module may store code C0000 and illuminate the steering warning light.
What is an EPS Module?
EPS stands for Electric Power Steering. Unlike traditional hydraulic steering systems, EPS uses an electric motor and control module to provide steering assistance.
The EPS Control Module continuously receives data from:
Vehicle Speed Sensor (VSS)
Engine Control Module (ECM)
ABS Control Module
Steering Angle Sensor
CAN Bus Network
Using this information, the system adjusts steering effort according to driving conditions.
Symptoms of C0000 Fault Code
When C0000 is present, drivers may experience:
EPS warning light ON
Heavy steering
Loss of power steering assistance
Steering becomes difficult at low speed
Intermittent steering assist
Check Engine Light ON
ABS warning light ON
Communication fault codes
Vehicle speed signal missing
Reduced steering performance
Common Causes of C0000
1. Faulty EPS Module
Internal failure of the Electric Power Steering Control Module can prevent proper processing of vehicle speed information.
2. Open Circuit in Wiring Harness
Broken or damaged wiring between the EPS module and other control modules can interrupt communication.
3. Short Circuit to Ground
Damaged insulation or wiring can create a short circuit affecting speed signal transmission.
4. Poor Electrical Connections
Loose, corroded, or damaged connectors may cause intermittent communication faults.
5. Faulty Vehicle Speed Signal
Missing speed information from:
ABS Module
Vehicle Speed Sensor
ECM
can trigger the fault code.
6. CAN Bus Communication Problems
Damaged CAN High or CAN Low wiring can prevent modules from exchanging information.
7. Engine Control Module (ECM) Fault
If the ECM is not transmitting vehicle speed information correctly, the EPS system may lose communication.
How Vehicle Speed Affects EPS Operation
The EPS module continuously adjusts steering assistance based on vehicle speed.
At Low Speeds
Maximum steering assistance
Easier parking
Reduced steering effort
At High Speeds
Reduced steering assistance
Improved road feel
Better vehicle stability
If speed information is missing, the EPS system may enter fail-safe mode and reduce steering assistance.
How to Diagnose C0000
Step 1 – Scan All Control Modules
Use professional diagnostic equipment such as:
Launch X431
Autel MaxiSys
Bosch KTS
OEM Diagnostic Tools
Check for communication faults in:
EPS Module
ABS Module
ECM
BCM
Step 2 – Inspect Wiring Harness
Check the EPS wiring harness for:
Open circuits
Short circuits
Damaged insulation
Corrosion
Repair any wiring faults found.
Step 3 – Check Ground Circuits
Verify:
EPS ground connections
ECM grounds
Battery grounds
Poor grounds frequently cause communication failures.
Step 4 – Check Vehicle Speed Signal
Using live data, verify:
Vehicle speed reading
Wheel speed sensor data
ABS speed information
If speed remains at 0 km/h while driving, further diagnosis is required.
Step 5 – Monitor Live Data
Using a scan tool, monitor:
Vehicle speed
Steering angle
EPS motor current
Steering torque sensor values
CAN Bus communication status
Compare readings with manufacturer specifications.
Step 6 – Check CAN Bus Network
Inspect:
CAN High voltage
CAN Low voltage
Network resistance
Communication integrity
A CAN Bus fault may prevent speed data from reaching the EPS module.
How to Fix C0000
Depending on diagnosis, repairs may include:
Repairing wiring harness damage
Repairing short circuits
Cleaning connectors
Replacing damaged connectors
Repairing CAN Bus circuits
Replacing wheel speed sensors
Repairing ABS module faults
Replacing EPS Control Module
Updating EPS software
Replacing ECM if necessary
Common Related Fault Codes
The following codes may appear together with C0000:
U0100 – Lost Communication with ECM
U0121 – Lost Communication with ABS Module
C0040 – Wheel Speed Sensor Fault
C0035 – Left Front Wheel Speed Sensor Circuit
U0001 – High Speed CAN Communication Bus
U0140 – Lost Communication with BCM
Estimated Repair Costs
| Repair Type | Estimated Cost |
|---|---|
| Diagnostic Scan | $50 – $150 |
| Wiring Repair | $50 – $300 |
| Wheel Speed Sensor Replacement | $50 – $250 |
| CAN Bus Repair | $100 – $500 |
| EPS Module Repair | $150 – $600 |
| EPS Module Replacement | $300 – $1,500 |
| ECM Repair/Programming | $200 – $2,000 |
Can You Drive with C0000?
The vehicle may still be drivable, but steering effort may increase significantly.
Possible risks include:
Heavy steering
Reduced vehicle control
Increased driver fatigue
Loss of EPS assistance
The issue should be diagnosed and repaired as soon as possible.
Conclusion
C0000 – Vehicle Speed Information Circuit Malfunction indicates that the Electric Power Steering (EPS) Module is not receiving accurate vehicle speed information or has detected a communication fault within the circuit. Common causes include faulty EPS modules, damaged wiring, CAN Bus communication problems, poor electrical connections, or ECM-related issues.
A proper diagnosis should include checking the wiring harness, testing for open or short circuits, verifying vehicle speed data through live scan tool readings, and inspecting communication between the EPS, ABS, and ECM modules. Early diagnosis can restore normal steering performance and prevent further electrical system faults.
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