C0248 moderate

Electronic Power Steering System Voltage Low

The C0248 code means the vehicle's onboard diagnostic system has detected: Electronic Power Steering System Voltage Low. This is a moderate severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: moderate
Estimated cost: $50 - $500 (parts and labor)

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Common Symptoms

Power steering warning light on
Steering assist reduced or intermittent
Steering heaviness especially at idle
Battery or charging system warning light
Steering assist returns at higher RPM

Probable Causes (Ranked by Likelihood)

Weak or failing battery Very High
Failing alternator not maintaining voltage High
Corroded battery terminals or ground connections Moderate
High electrical load from accessories reducing available voltage Moderate
EPS power supply wiring resistance Low

Step-by-Step Diagnostic Procedure

Test battery voltage -- should be 12.4V or higher with engine off
Test alternator output -- should be 13.5-14.8V with engine running
Inspect and clean battery terminals and ground connections
Check the EPS module power supply fuse and wiring
Monitor system voltage during heavy electrical loads with a scan tool

Frequently Asked Questions

Why does EPS need so much electrical power?

The EPS motor can draw 60 to 90 amps during heavy steering. A weak battery or failing alternator simply cannot supply enough current, causing the system to reduce or disable assist to protect the electrical system.

Can a dying battery cause steering problems?

Yes. A battery that is near the end of its life or has a dead cell cannot supply sufficient voltage under load. This is especially noticeable at idle when alternator output is lowest.

Why is steering harder at idle but fine while driving?

At idle, the alternator produces less output. Combined with EPS demand and other electrical loads, voltage drops. At higher RPM, the alternator produces more power, restoring adequate voltage for the EPS system.