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Home / DTC / U0131 — Lost Communication With Power Steering Control Module A

U0131 — Lost Communication With Power Steering Control Module A

Detailed page for trouble code U0131.

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U0131

Generic U — Network/User

Lost Communication With Power Steering Control Module A

Brand: Generic
Type: U — Network/User
Views: UK: 18 EN: 65 RU: 60
AI status
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Page language: EN

Causes

  • Power steering control module fault
  • Open/short or damage in CAN high/low wiring between modules
  • Corroded, loose or damaged connector at the power steering module
  • Blown fuse or loss of power/ground to the power steering module
  • Faulty vehicle network termination (missing/shorted resistor)
  • Intermittent wiring or connector (moisture, broken wire strands)

Symptoms

  • Power steering warning lamp or CAN/communication warning lamp illuminated
  • Loss or intermittent loss of electric power steering assist (heavier steering)
  • Related systems may show faults (ABS, ESC, instrument cluster)
  • Stored communication-related DTCs in other modules
  • Steering assist may operate in a fallback or reduced-assist mode
  • Possible intermittent failures that correlate with vibration or moisture exposure

What to check

  • Connect a qualified scan tool and read all stored and pending DTCs from all modules
  • Note whether the power steering control module appears on the scan tool’s module list/network browser
  • Inspect fuses and relays for the power steering module and for main vehicle CAN power circuits
  • Visually inspect the power steering module connector and wiring for corrosion, bent pins, damage, or water ingress
  • Backprobe power and ground pins at the power steering module with ignition ON (vehicle OFF where required)
  • Measure CAN High and CAN Low voltages at the power steering module connector and at a known-good module for comparison

Signal parameters

  • CAN High (recessive idle): ~2.5 V; dominant transitions up to ~3.5 V
  • CAN Low (recessive idle): ~2.5 V; dominant transitions down to ~1.5 V
  • CAN differential when active: ~1.5–2.5 V between CAN_H and CAN_L
  • Message presence: periodic steering-module CAN frames at expected intervals (scan tool/oscilloscope identification)
  • Power supply to module: battery voltage present at module Vbatt pin (within ~0.5 V of battery)
  • Ground: low resistance ground connection (near 0 Ω to chassis)

Diagnostic algorithm

  1. Attach a scan tool and record U0131 plus any other network-related DTCs and freeze-frame data
  2. Verify whether the power steering control module is listed on the network; if not present, confirm ignition/power state required for module wake-up
  3. Inspect fuses and relays supplying the power steering module; replace or repair if blown or missing
  4. Perform a visual and physical inspection of the power steering module connector and wiring harness for corrosion, loose pins, broken wires, or damage; repair as needed
  5. With ignition ON (and following vehicle OEM safety steps), backprobe the module power and ground pins to verify proper battery voltage and good ground
  6. Measure CAN_H and CAN_L voltages at the module connector and compare to a known-good module location; look for stuck-high, stuck-low, or missing recessive levels
  7. With an oscilloscope or CAN-capable scan tool, check for valid CAN waveforms and message traffic on the bus at multiple locations (near module and at gateway/ECM)
  8. If bus short or heavy load suspected, disconnect suspected modules one at a time (vehicle OFF and battery disconnected where required) to locate the source of bus fault
  9. Check termination resistance across CAN_H and CAN_L with power off (~60 ohms for two 120Ω terminators in parallel); repair missing/shorted terminators
  10. If wiring, connectors and bus integrity OK but module remains non-communicative, consider module replacement and perform required programming/configuration per manufacturer instructions
  11. After repairs, clear DTCs and perform test drive and network verification to ensure fault does not return

Likely causes

  • Open or short in CAN High/Low circuit to the power steering module
  • Power/ground missing at the power steering module (blown fuse, poor ground)
  • Corroded/loose connector at the power steering module pin(s)
  • Failed power steering control module
  • Network termination problem or another module pulling the bus low

Fault status

⚠️ Status
Lost Communication With Power Steering Control Module A — CAN messages from the power steering module not received.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0100 U0121 U0141 U0155
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