U0131

Universal

Lost Communication With Power Steering Control Module

Definition source: General OBD-II reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
High Severity

The power steering control module manages steering assistance. This code means another vehicle module detected that it could not communicate with it. Steering assist may be reduced or unavailable, but the code alone does not prove that the module has failed.

Report an error with this code

⚠️ Before You Begin (Safety First)

If steering suddenly becomes much harder, behaves unpredictably, or a steering warning appears, pull over somewhere safe and arrange assistance rather than continuing to drive. Loss of power assistance can make steering especially difficult at low speeds. If steering feels normal, have the fault checked promptly and follow any vehicle warnings.

Common Symptoms

  • A steering or power steering warning may appear if the vehicle reports that the module is unavailable.
  • Steering may require more effort if power assistance is reduced or lost, particularly at low speeds.
  • Power steering assistance may behave inconsistently if communication is intermittent.
  • There may be no noticeable symptoms if the communication loss was temporary or the vehicle's steering assist remains available.

Common Causes

  • A loose, damaged, or corroded connector or wire may interrupt communication with the power steering control module.
  • A problem with the module's power supply or ground may prevent it from operating or communicating.
  • A fault elsewhere in the vehicle communication network may prevent messages from reaching the module.
  • Low or unstable vehicle voltage may disrupt module operation or communication.
  • The power steering control module may have an internal fault, but the code alone does not confirm this.

Diagnostic Steps

  1. Note any steering changes and warning messages. If steering feels unusually heavy or unpredictable, stop driving when safe and arrange assistance.
  2. With the vehicle parked safely, check the owner's manual for relevant power steering warnings and fuse information; do not replace a fuse with a different rating or bypass protection.
  3. If available, use a scan tool capable of reading the power steering module. Record the codes from all accessible modules before clearing anything, since related codes can help distinguish a network issue from a module-specific problem.
  4. With the ignition off, visually inspect accessible wiring and connectors for looseness or visible damage. Do not unplug modules or probe wiring without vehicle-specific instructions.
  5. If the fault remains or steering assistance is affected, have a qualified technician test module power and ground and diagnose the communication network using vehicle-specific service information.

When to Call a Professional

Use a scan tool that can access the power steering module and compare its communication status with codes reported by other modules. Check the module's power, grounds, connectors, wiring, and vehicle network for faults before considering module replacement. Exact tests depend on the vehicle.

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Commonly Asked Questions

Does U0131 prove that the power steering control module is bad?

No. It indicates lost communication, which can result from a module power or ground issue, damaged wiring or connectors, a network fault, unstable voltage, or an internal module problem.

Can I drive with this code?

The code alone does not establish whether steering assistance is available. If steering is unusually hard or unpredictable, stop somewhere safe and arrange assistance. If it feels normal, have the fault diagnosed promptly and heed any vehicle warnings.

Why might there be no steering symptoms?

Communication loss may be temporary, or the steering system may still provide assistance. A scan-tool diagnosis can help determine whether the fault is current and whether other modules also report communication problems.

Should the power steering control module be replaced?

Not based on this code alone. A technician should check communication, power, ground, connectors, wiring, and related network faults before deciding whether the module needs replacement.

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