Code
U1112
HYUNDAI
U — Network/User
LIN Communication Error
Views:
UK: 10
EN: 35
RU: 26
AI status
Completed
Completed
100%
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
- Connect a scan tool and record all U‑codes and module presence. Identify which module(s) report U1112 and any related codes.
- 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.
- Verify power and ground to the involved modules (measure battery voltage and ground continuity). Repair any low supply or ground issues.
- Check fuses and junctions associated with the LIN master or affected modules; replace or repair as needed.
- 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.
- 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.
- 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.
- Check for available software updates or technical service bulletins for the vehicle and perform reprogramming if recommended.
- 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
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Code
U1112
MITSUBISHI
U — Network/User
SRS-ABG CAN timeout/Not equipped
Views:
UK: 8
EN: 16
RU: 22
AI status
Completed
Completed
100%
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
- Connect a scan tool and record all U‑codes and module presence. Identify which module(s) report U1112 and any related codes.
- 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.
- Verify power and ground to the involved modules (measure battery voltage and ground continuity). Repair any low supply or ground issues.
- Check fuses and junctions associated with the LIN master or affected modules; replace or repair as needed.
- 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.
- 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.
- 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.
- Check for available software updates or technical service bulletins for the vehicle and perform reprogramming if recommended.
- 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
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Code
U1112
Other
U — Network/User
SCP (J1850) Invalid or Missing Data for Primary Id
Views:
UK: 20
EN: 24
RU: 26
AI status
Completed
Completed
100%
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
- Connect a scan tool and record all U‑codes and module presence. Identify which module(s) report U1112 and any related codes.
- 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.
- Verify power and ground to the involved modules (measure battery voltage and ground continuity). Repair any low supply or ground issues.
- Check fuses and junctions associated with the LIN master or affected modules; replace or repair as needed.
- 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.
- 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.
- 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.
- Check for available software updates or technical service bulletins for the vehicle and perform reprogramming if recommended.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email