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Home / DTC / U1102 — ASC/TCL/ABS timeout/Not equipped

U1102 — ASC/TCL/ABS timeout/Not equipped

Detailed page for trouble code U1102.

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Code

U1102

MITSUBISHI U — Network/User

ASC/TCL/ABS timeout/Not equipped

Brand: MITSUBISHI
Type: U — Network/User
Views: UK: 10 EN: 25 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Loss of CAN/bus communication between ABS/ASC/TCL module and other control modules
  • Module not physically present or disabled by vehicle equipment configuration
  • Blown fuse or missing power/ground to the ABS/ASC/TCL module
  • Damaged connector, wiring short/open, or corrosion on CAN lines
  • Faulty ABS/ASC/TCL control module or other master module
  • Incorrect or missing software/calibration in replaced modules

Symptoms

  • ABS, ASC/TCL or traction control warning lamp illuminated
  • Loss of ABS/traction/stability control functionality
  • Related modules reporting communication errors or multiple U-codes
  • Possible degraded braking feel or traction intervention unavailable
  • Intermittent or permanent malfunction depending on wiring/module condition

What to check

  • Use a scan tool to read all stored & pending U-codes and related module codes
  • Confirm vehicle equipment level: verify if ABS/ASC/TCL is actually installed
  • Check for other communication codes (U0100, U0073, U0121, etc.) to identify bus-wide issues
  • Inspect fuses and relay(s) supplying ABS/ASC/TCL module power
  • Visually inspect module connectors and CAN wiring for damage or corrosion
  • Measure CAN-H and CAN-L voltages with ignition ON: both should be ~2.5 V (recessive) and show differential when active

Signal parameters

  • CAN bus nodes: ABS/ASC/TCL module should publish wheel speed, brake pressure, yaw, steering angle and status messages
  • CAN idle voltage (recessive): approx. 2.4–2.6 V on CAN-H and CAN-L
  • Dominant state: one line pulled toward ~1.0 V (differential ~2 V+), check with oscilloscope for healthy frames
  • Typical message behavior: periodic ABS messages at key intervals; a complete absence indicates timeout
  • Scan-tool PIDs: wheel speed sensors, ABS status, traction status, and module presence flags

Diagnostic algorithm

  1. Record freeze frame and all stored codes from all modules. Note any related U-codes.
  2. Confirm whether the vehicle is equipped with ASC/TCL/ABS per VIN/service documentation. If 'not equipped', clear code and document.
  3. Verify power and ground at the ABS/ASC/TCL module connector. Check fuses and relays feeding the module.
  4. With scan tool connected, observe CAN network: try to communicate to ABS module. If no response, check for bus activity with a scope or two multimeters measuring CAN-H and CAN-L.
  5. Inspect wiring harness and connectors for corrosion, pin damage, water ingress, or rodent damage between ABS module and main junctions.
  6. Check for shorts to battery or ground on CAN lines and continuity to other network modules. Measure CAN bus resistance (should be about 60 ohms for a properly terminated two-node system; verify vehicle-specific spec).
  7. If wiring and power are good but module still doesn't respond, swap with known-good module only if proper immobilizer and VIN programming considerations are handled; otherwise perform module reflash or reprogramming as required by manufacturer instructions.
  8. After repairs, clear codes and perform road test to confirm communication is restored and no related codes return. Re-scan all modules.

Likely causes

  • Open or short in CAN bus wiring or poor CAN termination
  • Fuse, power or ground fault at the ABS/ASC/TCL module
  • Module not installed / vehicle not equipped (software flag)
  • Failed ABS/ASC/TCL control module
  • Incompatible or corrupted module programming after replacement

Fault status

⚠️ Status
Communication timeout with ASC/TCL/ABS control module — module not responding on the vehicle network or vehicle reported as not equipped for ASC/TCL/ABS.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0100 U0073 U0121 U0140 U0155 U1100
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Code

U1102

Other U — Network/User

SCP (J1850) Invalid or Missing Data for Primary Id

Brand: Other
Type: U — Network/User
Views: UK: 19 EN: 41 RU: 28
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Loss of CAN/bus communication between ABS/ASC/TCL module and other control modules
  • Module not physically present or disabled by vehicle equipment configuration
  • Blown fuse or missing power/ground to the ABS/ASC/TCL module
  • Damaged connector, wiring short/open, or corrosion on CAN lines
  • Faulty ABS/ASC/TCL control module or other master module
  • Incorrect or missing software/calibration in replaced modules

Symptoms

  • ABS, ASC/TCL or traction control warning lamp illuminated
  • Loss of ABS/traction/stability control functionality
  • Related modules reporting communication errors or multiple U-codes
  • Possible degraded braking feel or traction intervention unavailable
  • Intermittent or permanent malfunction depending on wiring/module condition

What to check

  • Use a scan tool to read all stored & pending U-codes and related module codes
  • Confirm vehicle equipment level: verify if ABS/ASC/TCL is actually installed
  • Check for other communication codes (U0100, U0073, U0121, etc.) to identify bus-wide issues
  • Inspect fuses and relay(s) supplying ABS/ASC/TCL module power
  • Visually inspect module connectors and CAN wiring for damage or corrosion
  • Measure CAN-H and CAN-L voltages with ignition ON: both should be ~2.5 V (recessive) and show differential when active

Signal parameters

  • CAN bus nodes: ABS/ASC/TCL module should publish wheel speed, brake pressure, yaw, steering angle and status messages
  • CAN idle voltage (recessive): approx. 2.4–2.6 V on CAN-H and CAN-L
  • Dominant state: one line pulled toward ~1.0 V (differential ~2 V+), check with oscilloscope for healthy frames
  • Typical message behavior: periodic ABS messages at key intervals; a complete absence indicates timeout
  • Scan-tool PIDs: wheel speed sensors, ABS status, traction status, and module presence flags

Diagnostic algorithm

  1. Record freeze frame and all stored codes from all modules. Note any related U-codes.
  2. Confirm whether the vehicle is equipped with ASC/TCL/ABS per VIN/service documentation. If 'not equipped', clear code and document.
  3. Verify power and ground at the ABS/ASC/TCL module connector. Check fuses and relays feeding the module.
  4. With scan tool connected, observe CAN network: try to communicate to ABS module. If no response, check for bus activity with a scope or two multimeters measuring CAN-H and CAN-L.
  5. Inspect wiring harness and connectors for corrosion, pin damage, water ingress, or rodent damage between ABS module and main junctions.
  6. Check for shorts to battery or ground on CAN lines and continuity to other network modules. Measure CAN bus resistance (should be about 60 ohms for a properly terminated two-node system; verify vehicle-specific spec).
  7. If wiring and power are good but module still doesn't respond, swap with known-good module only if proper immobilizer and VIN programming considerations are handled; otherwise perform module reflash or reprogramming as required by manufacturer instructions.
  8. After repairs, clear codes and perform road test to confirm communication is restored and no related codes return. Re-scan all modules.

Likely causes

  • Open or short in CAN bus wiring or poor CAN termination
  • Fuse, power or ground fault at the ABS/ASC/TCL module
  • Module not installed / vehicle not equipped (software flag)
  • Failed ABS/ASC/TCL control module
  • Incompatible or corrupted module programming after replacement

Fault status

⚠️ Status
Communication timeout with ASC/TCL/ABS control module — module not responding on the vehicle network or vehicle reported as not equipped for ASC/TCL/ABS.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1-3 hours

Similar codes

U0100 U0073 U0121 U0140 U0155 U1100
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