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Home / DTC / U1106 — EPS CAN timeout/Not equipped

U1106 — EPS CAN timeout/Not equipped

Detailed page for trouble code U1106.

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U1106

MITSUBISHI U — Network/User

EPS CAN timeout/Not equipped

Brand: MITSUBISHI
Type: U — Network/User
Views: UK: 14 EN: 15 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open/short in CAN High or CAN Low wiring between EPS and CAN backbone
  • Poor or corroded connector(s) at the EPS module or junctions
  • EPS module not powered (blown fuse, relay, battery feed open) or poor ground
  • Faulty EPS control module
  • Bus termination fault or missing 60 Ω termination (open/short)
  • Multiple modules causing CAN bus overload or collisions (aftermarket devices, incorrect module fitted)

Symptoms

  • EPS warning lamp or master warning lamp illuminated
  • Loss or intermittent loss of power steering assist (steering heavy or unpredictable assist)
  • Steering assist may work after key cycle then drop out
  • Other CAN-related modules report communication errors or enter limp mode
  • Stored network communication DTCs in other modules

What to check

  • Use a compatible scan tool to read U1106 and any additional network DTCs from all modules (BCM, ECM, ABS, instrument cluster, EPS if present)
  • Verify vehicle equipment level — confirm whether vehicle should have an EPS module (dealer/parts data)
  • Check fuses and relays related to EPS power supply
  • Visually inspect EPS connector(s), wiring harness, and nearby areas for damage, corrosion, or water intrusion
  • Check for aftermarket devices tapping the CAN bus (alarms, telematics) and remove or isolate them
  • Measure CAN bus voltages and waveforms at the EPS connector and at another module with known-good communication (multimeter for DC voltages, oscilloscope for waveforms)

Signal parameters

  • CAN High (recessive): ~2.5 V (to ground)
  • CAN Low (recessive): ~2.5 V (to ground)
  • CAN High (dominant): ~3.5 V (approx), CAN Low (dominant): ~1.5 V (approx)
  • Typical CAN differential dominant amplitude: ~2.0 V
  • Termination resistance across CAN H–CAN L at key points: ~60 Ω (two 120 Ω in parallel)
  • EPS module supply voltage: ~12 V with ignition ON (verify within ~0.5 V)

Diagnostic algorithm

  1. Verify vehicle equipment: confirm EPS is fitted and check OEM module part numbers and configuration. If vehicle not equipped, U1106 may be a valid state — document and clear code if appropriate.
  2. Scan all modules: record U1106 and any other U-codes/P-codes; note freeze frame and MIL conditions.
  3. Inspect power/ground: verify EPS fuse(s), relay, power feed and ground at the module connector. Repair any faults.
  4. Visual/wiggle inspection: inspect connectors and harness from EPS to main CAN backbone for physical damage, corrosion, water entry; perform wiggle test while monitoring communication.
  5. Verify CAN bus basic parameters with multimeter: measure H and L DC voltages at EPS connector with ignition ON. Compare with expected values above.
  6. Use oscilloscope: observe CAN_H and CAN_L waveforms at EPS connector and at another module location. Look for missing frames, noise, flatline, dominant stuck, or corrupted signals.
  7. Check termination: measure resistance between CAN_H and CAN_L with power off; expect approx 60 Ω. Isolate sections if value incorrect to locate open/shorted termination.
  8. Isolate device: disconnect EPS connector (with ignition off) and see if network stabilizes or other modules recover — this helps identify if EPS transceiver is shorting the bus.
  9. Repair wiring/connectors or replace EPS module as indicated. If module replaced, program/configure per OEM procedure.
  10. After repair: clear codes, perform key cycles, and road test while monitoring for reoccurrence; confirm no additional network faults.

Likely causes

  • Disconnected or corroded EPS connector at steering column
  • Broken/chafed CAN wires near harness/steering column/door hinge area
  • Blown ignition-switched fuse or relay supplying EPS
  • Faulty EPS internal CAN transceiver
  • Incorrect BCM/ECU software or a vehicle that is not fitted with EPS (mismatch in equipment coding)

Fault status

⚠️ Status
U1106 — EPS CAN timeout / EPS module not equipped or not responding. Loss of communication with Electric Power Steering control module on CAN bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
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Code

U1106

Other U — Network/User

SCP (J1850) Invalid or Missing Data for Legislated Diagnostics

Brand: Other
Type: U — Network/User
Views: UK: 20 EN: 25 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open/short in CAN High or CAN Low wiring between EPS and CAN backbone
  • Poor or corroded connector(s) at the EPS module or junctions
  • EPS module not powered (blown fuse, relay, battery feed open) or poor ground
  • Faulty EPS control module
  • Bus termination fault or missing 60 Ω termination (open/short)
  • Multiple modules causing CAN bus overload or collisions (aftermarket devices, incorrect module fitted)

Symptoms

  • EPS warning lamp or master warning lamp illuminated
  • Loss or intermittent loss of power steering assist (steering heavy or unpredictable assist)
  • Steering assist may work after key cycle then drop out
  • Other CAN-related modules report communication errors or enter limp mode
  • Stored network communication DTCs in other modules

What to check

  • Use a compatible scan tool to read U1106 and any additional network DTCs from all modules (BCM, ECM, ABS, instrument cluster, EPS if present)
  • Verify vehicle equipment level — confirm whether vehicle should have an EPS module (dealer/parts data)
  • Check fuses and relays related to EPS power supply
  • Visually inspect EPS connector(s), wiring harness, and nearby areas for damage, corrosion, or water intrusion
  • Check for aftermarket devices tapping the CAN bus (alarms, telematics) and remove or isolate them
  • Measure CAN bus voltages and waveforms at the EPS connector and at another module with known-good communication (multimeter for DC voltages, oscilloscope for waveforms)

Signal parameters

  • CAN High (recessive): ~2.5 V (to ground)
  • CAN Low (recessive): ~2.5 V (to ground)
  • CAN High (dominant): ~3.5 V (approx), CAN Low (dominant): ~1.5 V (approx)
  • Typical CAN differential dominant amplitude: ~2.0 V
  • Termination resistance across CAN H–CAN L at key points: ~60 Ω (two 120 Ω in parallel)
  • EPS module supply voltage: ~12 V with ignition ON (verify within ~0.5 V)

Diagnostic algorithm

  1. Verify vehicle equipment: confirm EPS is fitted and check OEM module part numbers and configuration. If vehicle not equipped, U1106 may be a valid state — document and clear code if appropriate.
  2. Scan all modules: record U1106 and any other U-codes/P-codes; note freeze frame and MIL conditions.
  3. Inspect power/ground: verify EPS fuse(s), relay, power feed and ground at the module connector. Repair any faults.
  4. Visual/wiggle inspection: inspect connectors and harness from EPS to main CAN backbone for physical damage, corrosion, water entry; perform wiggle test while monitoring communication.
  5. Verify CAN bus basic parameters with multimeter: measure H and L DC voltages at EPS connector with ignition ON. Compare with expected values above.
  6. Use oscilloscope: observe CAN_H and CAN_L waveforms at EPS connector and at another module location. Look for missing frames, noise, flatline, dominant stuck, or corrupted signals.
  7. Check termination: measure resistance between CAN_H and CAN_L with power off; expect approx 60 Ω. Isolate sections if value incorrect to locate open/shorted termination.
  8. Isolate device: disconnect EPS connector (with ignition off) and see if network stabilizes or other modules recover — this helps identify if EPS transceiver is shorting the bus.
  9. Repair wiring/connectors or replace EPS module as indicated. If module replaced, program/configure per OEM procedure.
  10. After repair: clear codes, perform key cycles, and road test while monitoring for reoccurrence; confirm no additional network faults.

Likely causes

  • Disconnected or corroded EPS connector at steering column
  • Broken/chafed CAN wires near harness/steering column/door hinge area
  • Blown ignition-switched fuse or relay supplying EPS
  • Faulty EPS internal CAN transceiver
  • Incorrect BCM/ECU software or a vehicle that is not fitted with EPS (mismatch in equipment coding)

Fault status

⚠️ Status
U1106 — EPS CAN timeout / EPS module not equipped or not responding. Loss of communication with Electric Power Steering control module on CAN bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours
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