C0249 moderate

Electronic Power Steering System Voltage High

The C0249 code means the vehicle's onboard diagnostic system has detected: Electronic Power Steering System Voltage High. This is a moderate severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $100 - $500 (parts and labor)

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Common Symptoms

Power steering warning light on
EPS warning message on dashboard
Steering assist may be reduced
Electrical system symptoms like flickering lights
Battery overcharging signs

Probable Causes (Ranked by Likelihood)

Overcharging alternator producing excessive voltage Very High
Faulty voltage regulator in the alternator High
Poor ground connection causing voltage measurement error Moderate
Battery fault allowing voltage spikes Moderate
EPS module internal voltage sensing error Low

Step-by-Step Diagnostic Procedure

Test alternator output voltage -- should not exceed 14.8V at the battery
Check the voltage regulator function by monitoring voltage under varying loads
Inspect all ground connections for the EPS system
Test the battery for a shorted cell or other internal faults
Monitor system voltage with a scan tool during various driving conditions

Frequently Asked Questions

How much voltage is too high for EPS?

Most EPS systems are designed to operate between 10V and 16V. Sustained voltage above 16V can damage the EPS module electronics and trigger a high voltage code.

Can an overcharging alternator damage my EPS?

Yes. Excessive voltage can damage the sensitive electronics in the EPS control module and motor driver circuits. A faulty alternator should be replaced promptly to prevent expensive damage.

Is this related to a battery problem?

It can be. A battery with an internal short or dead cell can cause the alternator to overcompensate, producing higher-than-normal voltage. Testing both the battery and alternator is important.