‘C-series’ Code: Suggests problems with the feedback and electrical assist part of the system.Note: Sometimes a DTC is accompanied with a steering warning light.Īn example of the type of DTC’s you may encounter, are: Unfortunately, a DTC is sometimes only the beginning of the diagnosis journey, it usually takes expert electrical diagnostic knowledge to fully figure out the issue. In the EPS system, the codes would be located within the ECU and when the time came for finding the root cause of the problem, a specialised scan tool would be used to find and decipher all the DTC’s. Most electric power steering systems are able to self-diagnose any faults, with the use of diagnostic trouble codes (DTC). Keep reading to find out how you diagnose EPS issues. Fully electric systems mean you will be dealing with data, rather than power steering fluid or damaged pumps. When it comes to diagnosing issues with EPS systems, the process is very much different than how it is with hydraulic systems. For more detailed information on how it works, check out our article – Electric Power Steering Guide. Different sensors detect the input from the driver (torque, speed, position) and all this information is sent to the electric control unit (ECU), which calculates the amount of assistive torque needed and applies it via the electric motor (steering assistance motor). So, how do EPS systems work? Here is a little summary. This is not to be mistaken with the electro-hydraulic system a hybrid of both systems, where a hydraulic pump is powered by an electric motor.

As the automotive industry is evolving, more vehicles are shifting from the traditional hydraulic power steering systems to electric power steering (EPS).

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