EPS Warning Light
The Electric Power Steering (EPS) warning indicates a possible fault in the electric steering-assist system. Steering may become heavier if assistance is lost.
Reduce speed and avoid unnecessary driving if steering becomes unusually heavy. Have the EPS system scanned and inspected promptly.
EPS systems use an electric motor, control module, sensors, and vehicle network data to provide steering assistance. A warning may appear after low voltage, a sensor fault, or a genuine steering-system failure.
⚠️ Drive With Caution
If steering assistance is reduced or steering becomes abnormally heavy, stop in a safe place and arrange inspection. Do not continue normal driving with unpredictable steering.
$100-$2,500+ depending on sensor, wiring, motor, module, or steering repair
Repair costs vary depending on the exact diagnostic trouble code, vehicle make and model, labor rates, and which component has failed. Always diagnose the problem before replacing any parts.
An EPS warning can affect steering assistance. Check battery voltage first, then scan and test the steering system before assuming the EPS motor or module has failed.
Why did my steering suddenly go heavy?
The EPS module has shut off assistance after detecting a fault. The steering still works mechanically, but you are now turning the wheels unassisted, which is noticeably harder at parking speeds.
Can a weak battery cause the EPS light?
Yes, and it is one of the most common causes. The steering motor draws heavily, so a battery or alternator that cannot hold voltage will make the module drop assistance and log a fault.
How is an EPS warning diagnosed?
Check the battery and charging voltage before anything else, since low voltage causes a large share of these faults. Then scan the steering module, compare steering-angle and torque-sensor live data against wheel position, inspect the EPS connectors, and check the column and rack for mechanical binding.
How much does EPS repair cost?
A calibration or connector repair may be $150-$300. A replacement EPS motor or an electrically assisted rack typically runs $900-$2,500 fitted.
See every fault code, sensor test, and repair step for C1604