U0131 is set when the Powertrain Control Module (PCM) loses communication with the Electric Power Steering (EPS) Control Module on the vehicle's CAN network. This indicates a network communication failure rather than a direct steering problem, though it typically results in loss of power steering assist.
The EPS control module itself has failed internally, preventing communication on the CAN bus. This is the most common actual root cause of U0131.
Wiring harness damage, broken wires, or corroded connectors between the PCM and EPS module can break the communication link.
A weak, corroded, or loose ground connection at the EPS module can cause communication failures and intermittent codes.
The EPS module requires power from dedicated fuses and relays; if these fail, the module cannot communicate or function.
Problems with the CAN bus itself, such as shorts, opens, or interference from other failing modules, can prevent communication with the EPS.
Rarely, the PCM itself may have an internal communication issue, though this is an uncommon cause and should be diagnosed only after all other possibilities are ruled out.
No. Despite some sources suggesting PCM replacement, the Power Steering Control Module itself is the component that has failed in the vast majority of U0131 cases. The PCM is simply reporting that it cannot reach the EPS module - this does not indicate a PCM problem.
It is not recommended to drive any significant distance. When the EPS module loses communication, power steering assist typically fails, making steering much heavier, especially at low speeds or during parking maneuvers. This creates a safety concern.
No. U0131 is an electrical/communication fault, not a hydraulic issue. Fluid maintenance does not address communication failures between modules on the CAN bus.
Costs vary significantly by vehicle. If the EPS module itself is faulty, parts and labor can range from several hundred to over a thousand dollars depending on the vehicle. Wiring repairs or connector replacements are typically less expensive. Exact costs depend on your specific vehicle and local labor rates.