Electronic Power Steering System Voltage Low
What does C0248 mean?
The C0248 code means the vehicle's onboard diagnostic system has detected: Electronic Power Steering System Voltage Low. This is a moderate severity code.
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
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Test battery voltage -- should be 12.4V or higher with engine off
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Test alternator output -- should be 13.5-14.8V with engine running
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Inspect and clean battery terminals and ground connections
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Check the EPS module power supply fuse and wiring
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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.