U0131 medium Severity

U0131: Lost Communication With Power Steering Control Module (PSCM)

May cause heavy or lost power steering assist; can affect vehicle handling, especially at low speeds.

Overview

U0131 OBD‑II code indicates loss of communication between vehicle network (CAN bus) and the Power Steering Control Module leading to power steering assist issues.

Common Symptoms

  • Power steering warning light illuminated
  • Heavier steering effort required
  • Loss of power steering assist
  • Intermittent or no communication with PSCM on scan tool

Most Common Causes

Open or shorted CAN bus communication lines high

CAN bus interruption prevents proper data exchange with PSCM.

Loss of power or ground to PSCM high

Blown fuse, bad ground, or wiring fault can remove electrical supply to module.

Faulty Power Steering Control Module medium

Module internal failure or corrupted software leading to communication failure.

Corroded or damaged wiring/connectors medium

Physical connector damage often disrupts signal and voltage integrity.

Diagnostic Steps

  1. Connect professional OBD‑II scanner and confirm U0131 and related codes.
    Expected: U0131 present; attempt to communicate with PSCM.
    Interpretation: If PSCM responds to scan tool, fault may be intermittent or memory only; if no access, issue is active.
  2. Check fuses and relays supplying power to PSCM.
    Expected: All relevant fuses intact and functional.
    Interpretation: A blown fuse indicates power supply issue; replace and retest.
  3. Inspect power and ground circuits at PSCM with a multimeter.
    Expected: Battery voltage at power pins and solid ground readings.
    Interpretation: No voltage or poor ground indicates wiring/fuse issue.
  4. Visually inspect CAN high and low wiring and connectors to PSCM.
    Expected: No broken, corroded, or damaged wires/connectors.
    Interpretation: Damaged wiring can cause communication failure.
  5. Measure CAN bus voltage on CAN H and CAN L with ignition on.
    Expected: Approximately nominal differential voltages per manufacturer spec.
    Interpretation: Incorrect readings indicate bus fault.
  6. If wiring and power are good, consider PSCM replacement or software update.
    Expected: Communication restored after replacement or update.
    Interpretation: Restored communication confirms module failure or firmware issue.

Repair Solutions

Replace blown fuses and repair/secure power and ground connections easy
Estimated Cost: $20 - $150

Fuse and wiring repairs are lower cost and should be addressed first.

Repair or replace damaged CAN bus wiring/connectors medium
Estimated Cost: $100 - $400

Costs vary based on location and extent of harness damage.

Replace Power Steering Control Module and reprogram hard
Estimated Cost: $300 - $1000

PSCM replacement may require dealer programming.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Assuming PSCM is faulty without verifying power/ground and CAN connectivity

Frequently Asked Questions

What does a U0131 diagnostic trouble code signify?

The U0131 code stands for Lost Communication With Power Steering Control Module (PSCM). This generally indicates an issue with the Sensors system.

How serious is the U0131 code?

With a severity level of medium, may cause heavy or lost power steering assist; can affect vehicle handling, especially at low speeds.

Common signs of the U0131 error code

You may experience the following: Power steering warning light illuminated, Heavier steering effort required, Loss of power steering assist.

Common triggers for the U0131 error

It can be caused by several factors, most notably: Open or shorted CAN bus communication lines, Loss of power or ground to PSCM, Faulty Power Steering Control Module.

Is U0131 expensive to fix?

Repair costs depend on the specific failure. A simple Replace blown fuses and repair/secure power and ground connections replacement is relatively affordable ($20-$150), whereas a Replace Power Steering Control Module and reprogram repair is more expensive, potentially reaching $1000.

What cars are affected by the U0131 code?

Yes, U0131 is a generic code that applies to all OBD-II compliant vehicles, including Ford, Toyota, Honda, Chevrolet, Nissan, Dodge, BMW, and more.

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