Code
U0131
HYUNDAI
U — Network/User
Lost Communication With Power Steering Control Module
Views:
UK: 15
EN: 34
RU: 44
AI status
Completed
Completed
100%
Causes
- Open or short in CAN bus wiring (CAN High/Low)
- Faulty Power Steering Control Module (EPS/MDPS)
- Blown fuse or loss of module power or ground
- Loose, corroded or damaged connector at the steering module
- Network termination resistor open or incorrect
- Low battery or intermittent supply voltage
Symptoms
- Power steering assist reduced, lost, or switched to backup mode
- Steering warning light or EPS lamp illuminated
- Multiple network communication fault indicators or other modules showing communication errors
- Intermittent steering assist or sudden changes in steering feel
- Possible inability to clear code until communication is restored
What to check
- Read freeze frame and full scan list — note any other U0xxx or B/C/P codes
- Verify battery voltage (should be stable >12V) and key ON power rails
- Inspect fuse(s) for the power steering module and related circuits
- Visually inspect connectors and wiring at the steering control module for corrosion, damage or loose pins
- Check for continuity between module CAN pins and main CAN harness; check for shorts to battery and ground
- Measure CAN bus voltages with key ON at module connector (CANH/CANL idle levels)
Signal parameters
- CAN bus idle common-mode voltage: approx. 2.5 V (both CANH and CANL near this value)
- CANH dominant: ~3.5 V; CANL dominant: ~1.5 V during bus activity (differential ~2.0 V)
- Typical high-speed CAN data rate: 250–500 kbps (verify factory spec for vehicle)
- Termination resistance across CANH–CANL: ~60 ohms (two 120 ohm resistors in parallel) when measured at harness
- Module supply voltage: battery voltage (approx. 12–14 V with engine running) at module power pin
- Ground: near 0 V at module ground pin with key ON
Diagnostic algorithm
- Use a scan tool to confirm U0131 and record any related codes. Attempt to poll the power steering module; note if there is any response.
- Check and record battery voltage and key ON power to the steering module. Verify fuses and relays feeding the module.
- Visually inspect the module connector and harness for corrosion, bent pins, water intrusion, or damage. Repair as necessary.
- With ignition ON, backprobe module CANH and CANL. Verify idle voltages (~2.5 V) and differential signaling when another module transmits. If no activity, determine if bus is silent or module is not present.
- Measure resistance between CANH and CANL at harness: expect ~60 Ω. If open or very high, trace for an open in termination or disconnected ECU.
- Check continuity between the module CAN wires and other known good nodes (e.g., BCM, ECU). Repair any open or high-resistance circuits.
- Check for shorts: measure CANH and CANL to battery positive and to ground. Repair any short to supply or ground.
- If wiring and power/ground are good and other modules communicate on the same bus, consider replacing or reprogramming the power steering control module per manufacturer procedures.
- After repairs, clear codes and road test. Verify normal steering assist and that U0131 does not return.
Likely causes
- Disconnected or corroded connector at the power steering control module
- Broken CAN High or CAN Low conductor near the steering column
- Failed module due to internal fault
- Failed/missing CAN termination (open 120Ω/60Ω pair)
- Blown fuse supplying the steering control module
- Poor ground at module or chassis ground point
Fault status
Status
Lost communication with Power Steering Control Module — CAN bus or module not responding.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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