U0131 — Data Bus: Power Steering Control Module – No Communication #

Please note: The code label and description may vary depending on the vehicle manufacturer (OEM). Always refer to your OEM service manual for the exact terminology.

• U0131: Lost Communication With Power Steering Control Module (Ford, GM, Chrysler, Toyota, Honda)
• U0131: CAN Communication Error – Power Steering Module (Mercedes-Benz, BMW)
• U0131: No Signal from Electric Power Steering (Nissan, Hyundai, Kia)

Summary of code U0131 #

The U0131 OBD-II trouble code indicates that the vehicle’s main control network, known as the data bus or CAN (Controller Area Network) bus, has lost communication with the Power Steering Control Module (PSCM). This module is responsible for managing electric or hydraulic power steering functions. When communication fails, the vehicle’s computer cannot monitor or control the steering assist, potentially impacting drivability and safety. Drivers may notice a warning light, heavy steering, or even steering-related warning messages. Prompt diagnosis is crucial to ensure safe operation and prevent further electrical issues.

Common symptoms for code U0131 #

A faulty data link to the Power Steering Control Module doesn’t always cause a total loss of steering, but it often leads to noticeable changes in how the vehicle handles. Here’s what drivers and technicians may observe:

• Power steering warning light illuminated on the dashboard
• Heavy or unassisted steering (especially at low speeds)
• Intermittent loss of steering assist
• “Service Power Steering” or similar message displayed
• Other warning lights (ABS, traction control, or stability control may also trigger due to data bus issues)
• No communication with the PSCM during diagnostic scans

Likely causes for code U0131 #

In most cases, communications breakdowns are electrical in nature, but can stem from module failures or network wiring faults. Here are the top culprits, from most to least common:

1. Loose, corroded, or damaged wiring/connectors at the PSCM or along the CAN bus
2. Power Steering Control Module failure (internal fault or software issue)
3. CAN bus short or open circuit affecting communication lines
4. Blown fuse supplying power to the PSCM
5. Faulty ground connection for the PSCM or related components
6. Interference from other faulty modules on the network (e.g., ABS, ECM)

Step-by-step diagnostic for code U0131 #

Pinpointing the root cause of U0131 requires a logical, methodical approach. Here’s a proven process for technicians and advanced DIYers:

• Confirm the code using a professional scan tool that can access the PSCM and other modules on the CAN network.
• Check for related codes (especially communication codes from other modules) to determine if the issue is isolated or network-wide.
• Inspect fuses and relays associated with the power steering system and CAN bus circuits.
• Thoroughly examine wiring and connectors at the PSCM for corrosion, damage, moisture, or loose pins. Gently tug wires to check for hidden breaks.
• Test CAN bus continuity and resistance using a digital multimeter. Typical values: 60 ohms across CAN-H and CAN-L with modules powered off.
• Check power and ground at the PSCM with the ignition on. Voltage and ground readings must be within OEM specs.
• Attempt module communication via scan tool; if no response, suspect module or wiring.
• Substitute with a known good PSCM or reflash/update software if all else checks out and the module is accessible.

Possible repairs for code U0131 #

Repair actions depend entirely on the diagnostic findings. Address the most likely and accessible issues first, and never replace expensive parts without proper testing. Here’s what may be required:

• Repair or replace damaged wiring and connectors in the power steering circuit or CAN bus network
• Clean and secure all electrical connections to the PSCM and related fuses or grounds
• Replace blown fuses or faulty relays after resolving the underlying cause
• Reprogram or update PSCM software (if an OEM update is available and recommended)
• Replace the Power Steering Control Module only if it fails all communication and power/ground tests
• Address any other module issues that may be corrupting the CAN bus (such as ABS or ECM faults)

Is it safe to drive with code U0131? #

Driving with U0131 is not recommended, especially if steering assist is lost or intermittent. While some vehicles may default to manual steering, this requires much more effort—particularly at low speeds or when parking. A sudden loss of power assist can take drivers by surprise, increasing accident risk. Additionally, unresolved CAN communication issues can cascade, affecting other safety systems. It’s best to have the vehicle inspected and repaired promptly.

Vehicles most commonly affected by code U0131 #

While U0131 can occur on any modern vehicle equipped with electric or electronically assisted power steering, certain makes/models are more commonly reported in technical bulletins and forums. These typically include:

• Ford (F-150, Focus, Fusion, Escape)
• Chevrolet (Malibu, Silverado, Equinox)
• Chrysler (300, Pacifica, Town & Country)
• Toyota (Camry, Corolla, Highlander)
• Honda (Civic, Accord, CR-V)
• Nissan (Altima, Rogue, Sentra)
• Hyundai/Kia (Sonata, Elantra, Sorento)
• BMW, Mercedes-Benz (with advanced electric steering)

Common mistakes and best practices for code U0131 #

Misdiagnosis can lead to wasted time and unnecessary part replacements. To avoid the most frequent errors, follow these best practices:

• Don’t replace the PSCM without verifying power, ground, and network integrity first.
• Always inspect connectors and wiring for hidden corrosion, especially after water leaks or collision repairs.
• Check for other communication codes—a single module rarely causes all network failures.
• Use OEM service information and wiring diagrams to avoid guesswork.
• Clear codes and retest after each repair step; some faults are intermittent and may not return immediately.

U0131 FAQ (Fast Answers) #

Got questions? Here are quick answers to what most drivers and techs ask:

• Q: Can low battery voltage trigger U0131?
  A: Yes, if the battery is weak or recently disconnected, module communication can be interrupted. Always check battery health and charge before deeper diagnostics.
• Q: Will a steering alignment fix a U0131 code?
  A: No, U0131 is strictly an electrical/network fault. Mechanical alignment or suspension repairs will not resolve this communication error.
• Q: Is U0131 covered by warranty?
  A: If your vehicle is still under manufacturer warranty, electronic steering components and related wiring are often covered. Always check with your dealer or OEM first.