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Home / DTC / U0131 — Lost communication with the hydraulic steering control module

U0131 — Lost communication with the hydraulic steering control module

Detailed page for trouble code U0131.

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U0131

LAND ROVER U — Network/User

Lost communication with the hydraulic steering control module

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 4 EN: 22 RU: 26
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Page language: EN

Causes

  • Open or short in CAN wiring between HSCM and network
  • Corroded or loose connector at HSCM or gateway module
  • HSCM power supply or ground fault (fuse, relay, battery)
  • Failed HSCM (internal fault)
  • Faulty gateway/BCM or other module preventing message routing
  • Incorrect or missing software calibration (module programming)

Symptoms

  • Steering assist warning lamp or message
  • Hard steering or loss of power-assisted steering
  • Multiple related communication DTCs stored
  • Vehicle may enter a reduced steering assist mode
  • Other modules reporting loss of messages from HSCM

What to check

  • Read and record all stored codes and freeze frame data with a capable scan tool
  • Verify battery voltage is within normal range (engine off and cranking)
  • Visually inspect HSCM connectors and wiring for damage, corrosion, or water intrusion
  • Check fuses and relays related to HSCM power and ignition circuits
  • Confirm good ground(s) at HSCM and gateway modules
  • Check CAN-H and CAN-L voltages at HSCM connector (key on, engine off) and compare to known-good values

Signal parameters

  • CAN bus idle (recessive) typical voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
  • CAN bus dominant state typical voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
  • Differential voltage for valid frame ≈ 2.0 V ± tolerances
  • Bus termination expected total ≈ 60 Ω across CAN_H and CAN_L (two 120 Ω terminators in parallel)
  • Typical high-speed CAN data rate on steering network: often 500 kb/s (verify manufacturer data)

Diagnostic algorithm

  1. Connect a manufacturer-level scan tool. Read all U-codes and related codes, record freeze frame and MIL state.
  2. Confirm battery voltage and charging system health. Low voltage can cause communication errors.
  3. Visually inspect the HSCM connector(s), wiring harness, and any splice points for corrosion, bent pins, or water ingress.
  4. Check fuses/relays supplying HSCM power and ignition-switched feed. Verify presence of proper Vb at module power pin(s) with key ON.
  5. Verify ground(s) at the HSCM—measure for low resistance to chassis ground and correct voltage drop under load.
  6. With ignition ON (engine off), measure CAN_H and CAN_L at the HSCM connector. Compare to expected recessive voltages (~2.5 V) and check for shorts to battery or ground.
  7. With ignition ON, measure resistance across CAN_H and CAN_L (ign off recommended). Expect ~60 Ω. If open or very low, trace and repair wiring/terminator.
  8. Use a scope to view CAN waveform while crank/idle if necessary. Look for corrupted frames, missing messages, or bus noise.
  9. Check communication from gateway/BCM to confirm whether the HSCM is not sending messages or the network/gateway is not passing them.
  10. Inspect for aftermarket devices tied into CAN; disconnect and retest.
  11. If wiring, power, and grounds verify OK but no communication, attempt to re-flash/reprogram the HSCM per manufacturer procedure if available.
  12. If reprogramming is not available or unsuccessful, replace the HSCM only after confirming fault is not wiring, power, or gateway-related. Recheck and clear codes; road test and verify.

Likely causes

  • Loose/corroded connector at HSCM
  • Blown fuse or poor power/ground to HSCM
  • CAN bus short or open between HSCM and gateway
  • Failed HSCM

Fault status

⚠️ Status
Lost communication with Hydraulic Steering Control Module (HSCM). No valid CAN messages received from the HSCM or module failed to respond to network requests.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

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