C0740
Electric Power Steering Voltage Supply
The supply voltage to the EPS module is out of range, reducing or disabling power assist.
- Check engine light: Not always
- Emissions related: No
- Repair difficulty: medium
Symptoms
- ABS warning light on
- ESC/stability control deactivated
- Possible reduced brake assist
- Speedometer may behave erratically
Common causes
Ordered by how often each turns out to be the cause.
- Battery undervoltage during high steering loadCommon
- Ground point corrodedPossible
Parts involved
- Eps Control Module
- Power Supply Wiring
- Battery
C0740 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.