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Home / DTC / U1112 — LIN Communication Error

U1112 — LIN Communication Error

Detailed page for trouble code U1112.

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11,451generic
22,461specific
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Code

U1112

HYUNDAI U — Network/User

LIN Communication Error

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 22 EN: 88 RU: 57
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed LIN wiring harness
  • Loose, corroded, or pushed‑out connector pins
  • Failed LIN transceiver in a module (master or slave)
  • Short to battery or ground on the LIN wire
  • Low battery voltage or intermittent power/ground to affected module(s)
  • Water intrusion or contamination at connectors or junctions

Symptoms

  • One or more vehicle modules not responding to diagnostic scanner
  • Intermittent or permanent loss of features controlled over LIN (e.g., door/window/seat functions, keyless entry indicators)
  • Warning messages or icons displayed on instrument cluster
  • Multiple network-related DTCs or module present/not present messages
  • Intermittent operation of affected circuits (e.g., mirrors, windows, interior lights)

What to check

  • Retrieve all network codes and freeze frame data with a capable scan tool; note which module reported U1112
  • Visually inspect LIN wiring, harness routing near doors/hinges, and connector condition for damage or corrosion
  • Verify battery voltage and main power/ground to the affected module(s)
  • Check related fuses, relays, and junction blocks for continuity and proper seating
  • Perform a wiggle test on harness and connectors while monitoring communication status
  • Use an oscilloscope or suitable scope-capable scan tool to observe LIN bus signal waveform and idle level

Signal parameters

  • LIN: single-wire low-speed serial bus (master/slave), typical baud rates ~1–20 kbps (often 9.6 or 19.2 kbps)
  • Idle (recessive) state pulled toward vehicle battery voltage through pull-up; dominant state driven low
  • Signal levels referenced to vehicle ground; low ~0 V when active, high near VBAT when idle
  • Bus topology: one master, multiple slaves; message IDs and schedules controlled by master/gateway

Diagnostic algorithm

  1. Connect a scan tool and record all U‑codes and module presence. Identify which module(s) report U1112 and any related codes.
  2. Inspect wiring and connectors for the affected LIN circuit(s): look for damage at hinges, grommets, under trim, and at module connectors. Repair any obvious faults.
  3. Verify power and ground to the involved modules (measure battery voltage and ground continuity). Repair any low supply or ground issues.
  4. Check fuses and junctions associated with the LIN master or affected modules; replace or repair as needed.
  5. With ignition on, monitor the LIN bus using an oscilloscope or scope-capable diagnostic tool. Confirm idle level, message activity, and absence of excessive noise or bus short.
  6. If the bus is shorted or shows no activity, isolate sections of the network by unplugging suspected modules/junctions to locate the fault. Re-check waveforms after each isolation.
  7. If a single module is causing bus errors when connected, verify its connectors and replace the module only after wiring and power/ground have been confirmed good.
  8. Check for available software updates or technical service bulletins for the vehicle and perform reprogramming if recommended.
  9. Clear codes and perform a functional/road test to ensure the issue is resolved and codes do not return.

Likely causes

  • Open or shorted LIN wire at a door hinge, harness grommet, or control module connector
  • Corroded connector pin or poor mating at a module (door module, BCM, or gateway)
  • Failed LIN transceiver inside the reporting module or the LIN master/gateway
  • Intermittent ground or low supply to the module producing communication errors

Fault status

⚠️ Status
LIN communication error — module reports lost or invalid LIN bus messages. Possible wiring, connector, transceiver, or power/ground issue on the LIN network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

U0100 U0102 U0115 U0121 U1111 U1113
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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Code

U1112

MITSUBISHI U — Network/User

SRS-ABG CAN timeout/Not equipped

Brand: MITSUBISHI
Type: U — Network/User
Views: UK: 22 EN: 42 RU: 48
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed LIN wiring harness
  • Loose, corroded, or pushed‑out connector pins
  • Failed LIN transceiver in a module (master or slave)
  • Short to battery or ground on the LIN wire
  • Low battery voltage or intermittent power/ground to affected module(s)
  • Water intrusion or contamination at connectors or junctions

Symptoms

  • One or more vehicle modules not responding to diagnostic scanner
  • Intermittent or permanent loss of features controlled over LIN (e.g., door/window/seat functions, keyless entry indicators)
  • Warning messages or icons displayed on instrument cluster
  • Multiple network-related DTCs or module present/not present messages
  • Intermittent operation of affected circuits (e.g., mirrors, windows, interior lights)

What to check

  • Retrieve all network codes and freeze frame data with a capable scan tool; note which module reported U1112
  • Visually inspect LIN wiring, harness routing near doors/hinges, and connector condition for damage or corrosion
  • Verify battery voltage and main power/ground to the affected module(s)
  • Check related fuses, relays, and junction blocks for continuity and proper seating
  • Perform a wiggle test on harness and connectors while monitoring communication status
  • Use an oscilloscope or suitable scope-capable scan tool to observe LIN bus signal waveform and idle level

Signal parameters

  • LIN: single-wire low-speed serial bus (master/slave), typical baud rates ~1–20 kbps (often 9.6 or 19.2 kbps)
  • Idle (recessive) state pulled toward vehicle battery voltage through pull-up; dominant state driven low
  • Signal levels referenced to vehicle ground; low ~0 V when active, high near VBAT when idle
  • Bus topology: one master, multiple slaves; message IDs and schedules controlled by master/gateway

Diagnostic algorithm

  1. Connect a scan tool and record all U‑codes and module presence. Identify which module(s) report U1112 and any related codes.
  2. Inspect wiring and connectors for the affected LIN circuit(s): look for damage at hinges, grommets, under trim, and at module connectors. Repair any obvious faults.
  3. Verify power and ground to the involved modules (measure battery voltage and ground continuity). Repair any low supply or ground issues.
  4. Check fuses and junctions associated with the LIN master or affected modules; replace or repair as needed.
  5. With ignition on, monitor the LIN bus using an oscilloscope or scope-capable diagnostic tool. Confirm idle level, message activity, and absence of excessive noise or bus short.
  6. If the bus is shorted or shows no activity, isolate sections of the network by unplugging suspected modules/junctions to locate the fault. Re-check waveforms after each isolation.
  7. If a single module is causing bus errors when connected, verify its connectors and replace the module only after wiring and power/ground have been confirmed good.
  8. Check for available software updates or technical service bulletins for the vehicle and perform reprogramming if recommended.
  9. Clear codes and perform a functional/road test to ensure the issue is resolved and codes do not return.

Likely causes

  • Open or shorted LIN wire at a door hinge, harness grommet, or control module connector
  • Corroded connector pin or poor mating at a module (door module, BCM, or gateway)
  • Failed LIN transceiver inside the reporting module or the LIN master/gateway
  • Intermittent ground or low supply to the module producing communication errors

Fault status

⚠️ Status
LIN communication error — module reports lost or invalid LIN bus messages. Possible wiring, connector, transceiver, or power/ground issue on the LIN network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

U0100 U0102 U0115 U0121 U1111 U1113
406

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

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U1112

Other U — Network/User

SCP (J1850) Invalid or Missing Data for Primary Id

Brand: Other
Type: U — Network/User
Views: UK: 29 EN: 41 RU: 48
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or chafed LIN wiring harness
  • Loose, corroded, or pushed‑out connector pins
  • Failed LIN transceiver in a module (master or slave)
  • Short to battery or ground on the LIN wire
  • Low battery voltage or intermittent power/ground to affected module(s)
  • Water intrusion or contamination at connectors or junctions

Symptoms

  • One or more vehicle modules not responding to diagnostic scanner
  • Intermittent or permanent loss of features controlled over LIN (e.g., door/window/seat functions, keyless entry indicators)
  • Warning messages or icons displayed on instrument cluster
  • Multiple network-related DTCs or module present/not present messages
  • Intermittent operation of affected circuits (e.g., mirrors, windows, interior lights)

What to check

  • Retrieve all network codes and freeze frame data with a capable scan tool; note which module reported U1112
  • Visually inspect LIN wiring, harness routing near doors/hinges, and connector condition for damage or corrosion
  • Verify battery voltage and main power/ground to the affected module(s)
  • Check related fuses, relays, and junction blocks for continuity and proper seating
  • Perform a wiggle test on harness and connectors while monitoring communication status
  • Use an oscilloscope or suitable scope-capable scan tool to observe LIN bus signal waveform and idle level

Signal parameters

  • LIN: single-wire low-speed serial bus (master/slave), typical baud rates ~1–20 kbps (often 9.6 or 19.2 kbps)
  • Idle (recessive) state pulled toward vehicle battery voltage through pull-up; dominant state driven low
  • Signal levels referenced to vehicle ground; low ~0 V when active, high near VBAT when idle
  • Bus topology: one master, multiple slaves; message IDs and schedules controlled by master/gateway

Diagnostic algorithm

  1. Connect a scan tool and record all U‑codes and module presence. Identify which module(s) report U1112 and any related codes.
  2. Inspect wiring and connectors for the affected LIN circuit(s): look for damage at hinges, grommets, under trim, and at module connectors. Repair any obvious faults.
  3. Verify power and ground to the involved modules (measure battery voltage and ground continuity). Repair any low supply or ground issues.
  4. Check fuses and junctions associated with the LIN master or affected modules; replace or repair as needed.
  5. With ignition on, monitor the LIN bus using an oscilloscope or scope-capable diagnostic tool. Confirm idle level, message activity, and absence of excessive noise or bus short.
  6. If the bus is shorted or shows no activity, isolate sections of the network by unplugging suspected modules/junctions to locate the fault. Re-check waveforms after each isolation.
  7. If a single module is causing bus errors when connected, verify its connectors and replace the module only after wiring and power/ground have been confirmed good.
  8. Check for available software updates or technical service bulletins for the vehicle and perform reprogramming if recommended.
  9. Clear codes and perform a functional/road test to ensure the issue is resolved and codes do not return.

Likely causes

  • Open or shorted LIN wire at a door hinge, harness grommet, or control module connector
  • Corroded connector pin or poor mating at a module (door module, BCM, or gateway)
  • Failed LIN transceiver inside the reporting module or the LIN master/gateway
  • Intermittent ground or low supply to the module producing communication errors

Fault status

⚠️ Status
LIN communication error — module reports lost or invalid LIN bus messages. Possible wiring, connector, transceiver, or power/ground issue on the LIN network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

U0100 U0102 U0115 U0121 U1111 U1113
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