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Home / DTC / U1126 — EPS(CAN message)

U1126 — EPS(CAN message)

Detailed page for trouble code U1126.

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Code

U1126

MITSUBISHI U — Network/User

EPS(CAN message)

Brand: MITSUBISHI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty EPS control module (internal failure)
  • Open/short or intermittent wiring between EPS and CAN bus
  • Poor or corroded connector(s) at EPS, gateway, or junction connectors
  • Failed or missing CAN bus termination resistor(s)
  • Low or unstable battery/charging system voltage
  • Faulty gateway / network interface module or other bus master

Symptoms

  • EPS warning lamp or instrument cluster error related to power steering
  • Loss or reduction of electric power steering assist (heavy steering)
  • Steering assist may work intermittently
  • Related modules may report communication errors or reduced functionality
  • DTC U1126 stored in one or more modules

What to check

  • Read and record all stored DTCs from all modules (scan tool); note freeze frame and occurrence conditions
  • Verify battery voltage and charging system (engine off and cranking voltage)
  • Visually inspect EPS connectors, pins and harness for damage, corrosion, or water intrusion
  • Check relevant fuses and relays for EPS and CAN bus power
  • Check whether the EPS module appears on the vehicle CAN network using a scan tool
  • Measure CAN bus termination resistance (approx. 60 ohms across CAN_H and CAN_L with ignition off)

Signal parameters

  • Ignition on, CAN_H voltage ~2.5 V (recessive idle), CAN_L ~2.5 V (recessive idle); dominant state typically CAN_H ~3.5 V / CAN_L ~1.5 V
  • Bus termination resistance ≈ 60 ohms (two 120 Ω resistors in parallel) across CAN_H and CAN_L
  • EPS CAN message ID present at regular intervals when healthy (message frequency varies by model; consult service manual)
  • Supply voltage to EPS: vehicle battery voltage present at EPS power pins with ignition on
  • CAN bus error counters and bus load (%) as reported by diagnostic tool

Diagnostic algorithm

  1. Connect a full-function scan tool and read codes from all modules. Note related U-codes and freeze frame data.
  2. Verify battery and charging voltages. Low voltage can cause modules to drop off the bus—correct if out of spec.
  3. Visually inspect EPS connector, junction connectors, and any inline splices. Repair corrosion/damage as found.
  4. With ignition on, confirm the EPS module responds to the scan tool or appears on the CAN network. If it is absent, attempt communication after clearing codes.
  5. Check fuses/power feeds to EPS. Backprobe EPS power and ground pins to confirm battery voltage and good ground.
  6. Measure CAN bus resistance across CAN_H and CAN_L with ignition off; expect about 60 Ω. If open or shorted, isolate wiring segments and repair.
  7. Use an oscilloscope or high-speed data logger to inspect CAN_H and CAN_L signals near the EPS connector while another known-good module transmits. Look for missing messages, excessive noise, or dominant faults.
  8. Isolate the fault by disconnecting sections: disconnect EPS module and re-check bus; if bus returns to normal, fault likely at EPS or its harness. If bus still faulty, inspect wiring and other modules on same branch.
  9. Check for aftermarket parts (alarms, trackers) that may tap the CAN. Disconnect or remove to retest.
  10. If wiring and power are good but EPS module does not communicate, refer to service manual for module reprogramming/replacement procedures. Replace module only after verifying communication fault is not caused by wiring or other modules.
  11. After repair, clear codes and perform road test verifying EPS operation and that code U1126 does not return.

Likely causes

  • Loose/corroded connector or damaged harness at the EPS module
  • Network wiring short or open on CAN_H or CAN_L to EPS
  • Failed or non-responsive EPS module
  • Missing/failed bus termination or damaged CAN transceiver on gateway/module

Fault status

⚠️ Status
No CAN messages received from the EPS control module — CAN timeout or missing EPS messages detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0121 U0122 U1116 U1120
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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