Code
U0113
Generic
U — Network/User
Lost Communication With Emissions Critical Control Information
Views:
UK: 17
EN: 19
RU: 17
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring or connector on CAN/vehicle network
- Faulty or unpowered emissions control module (ECM/PCM/other)
- Poor battery voltage or intermittent power/ground to module(s)
- Failed gateway, network interface module, or bus driver
- Missing or incorrect CAN termination (open/shorted terminating resistor)
- Software mismatch, incomplete reflash, or corrupted module programming
Symptoms
- Malfunction Indicator Lamp (MIL/CEL) illuminated
- Loss of emissions-related functions or reduced engine performance
- Failed readiness monitors or inability to complete emissions test
- Multiple U‑codes or other module communication DTCs present
- Intermittent operation of components tied to missing module
- Possible limp‑in / reduced power mode depending on system
What to check
- Connect a scan tool and record stored and pending DTCs and freeze frame
- Check battery voltage (key on and cranking) and inspect main fuses/relays
- Visually inspect connectors and wiring to emissions module(s) and gateway for corrosion, water, or physical damage
- Check for recent service/aftermarket additions that may alter network wiring
- Use a multimeter or scope to measure CAN‑H and CAN‑L voltages and noise
- Measure termination resistance across CAN‑H and CAN‑L with power off (~60 ohms typical for two 120Ω terminators in parallel)
Signal parameters
- CAN‑H steady idle ~2.5 V (normal range ~2.5–3.5 V depending on vehicle)
- CAN‑L steady idle ~2.5 V (normal range ~1.5–2.5 V when active; differential ~1–2 V during data bits)
- Differential voltage during activity typically ~1.0–2.0 V between CAN‑H and CAN‑L
- Termination resistance across CAN‑H and CAN‑L with power off normally ~60 ohms (vehicle dependent)
- Expected periodic broadcast messages from emissions module (frequency varies by vehicle; absence indicates no transmit)
- Excessive bus error/traffic or unnatural voltages indicate shorts, open circuit, or noise
Diagnostic algorithm
- Record all codes and freeze frame data. Note any other U‑codes present.
- Verify good battery voltage and charging. Replace or recharge battery if low and clear codes, then recheck.
- Inspect connectors and wiring at emissions module(s), gateway, and common splice points for corrosion, pin damage, or loose terminals.
- With ignition ON, attempt to communicate with the emissions module using a capable scan tool. If no communication, move to electrical checks.
- Check for power and ground at the emissions module connector(s). Backprobe to confirm constant and switched power as applicable and reliable ground.
- With ignition ON, measure CAN‑H and CAN‑L voltages at the module connector. Compare to expected values. Use oscilloscope to view waveform integrity and noise if available.
- With power off, measure termination resistance across CAN‑H and CAN‑L near the fault and at multiple points to locate opens or incorrect termination.
- Isolate sections of the bus by disconnecting downstream modules one at a time while observing network traffic to localize the fault to a module or wiring section.
- If a specific module is found not to transmit but has proper power/ground, attempt module reset/reprogramming per manufacturer procedure or replace module if software/hardware confirmed faulty.
- After repairs, clear codes, perform a functional test and a drive cycle or emissions readiness confirmation. Monitor for reoccurrence.
- Safety note: take anti‑static precautions and disconnect battery when performing connector repairs; use manufacturer procedures for module programming.
Likely causes
- Damaged CAN‑H/CAN‑L wiring near emissions module or common splice
- Faulty ECM/PCM not transmitting required emissions messages
- Loose or corroded power/ground at emissions module or gateway
- Failed gateway or bus transceiver on module preventing message relay
- Low battery voltage during module reprogramming left module offline
- Short circuit between CAN lines or to chassis/battery
Fault status
Status
Lost communication with emissions‑critical control module(s). Required emissions data/messages not received on vehicle network. DTC stored; inspect network, power/ground, and module.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Code
U0113
HYUNDAI
U — Network/User
Lost Communication With Emissions Critical Control Information
Views:
UK: 9
EN: 14
RU: 14
AI status
Completed
Completed
100%
Causes
- Open, shorted, or corroded wiring or connector on CAN/vehicle network
- Faulty or unpowered emissions control module (ECM/PCM/other)
- Poor battery voltage or intermittent power/ground to module(s)
- Failed gateway, network interface module, or bus driver
- Missing or incorrect CAN termination (open/shorted terminating resistor)
- Software mismatch, incomplete reflash, or corrupted module programming
Symptoms
- Malfunction Indicator Lamp (MIL/CEL) illuminated
- Loss of emissions-related functions or reduced engine performance
- Failed readiness monitors or inability to complete emissions test
- Multiple U‑codes or other module communication DTCs present
- Intermittent operation of components tied to missing module
- Possible limp‑in / reduced power mode depending on system
What to check
- Connect a scan tool and record stored and pending DTCs and freeze frame
- Check battery voltage (key on and cranking) and inspect main fuses/relays
- Visually inspect connectors and wiring to emissions module(s) and gateway for corrosion, water, or physical damage
- Check for recent service/aftermarket additions that may alter network wiring
- Use a multimeter or scope to measure CAN‑H and CAN‑L voltages and noise
- Measure termination resistance across CAN‑H and CAN‑L with power off (~60 ohms typical for two 120Ω terminators in parallel)
Signal parameters
- CAN‑H steady idle ~2.5 V (normal range ~2.5–3.5 V depending on vehicle)
- CAN‑L steady idle ~2.5 V (normal range ~1.5–2.5 V when active; differential ~1–2 V during data bits)
- Differential voltage during activity typically ~1.0–2.0 V between CAN‑H and CAN‑L
- Termination resistance across CAN‑H and CAN‑L with power off normally ~60 ohms (vehicle dependent)
- Expected periodic broadcast messages from emissions module (frequency varies by vehicle; absence indicates no transmit)
- Excessive bus error/traffic or unnatural voltages indicate shorts, open circuit, or noise
Diagnostic algorithm
- Record all codes and freeze frame data. Note any other U‑codes present.
- Verify good battery voltage and charging. Replace or recharge battery if low and clear codes, then recheck.
- Inspect connectors and wiring at emissions module(s), gateway, and common splice points for corrosion, pin damage, or loose terminals.
- With ignition ON, attempt to communicate with the emissions module using a capable scan tool. If no communication, move to electrical checks.
- Check for power and ground at the emissions module connector(s). Backprobe to confirm constant and switched power as applicable and reliable ground.
- With ignition ON, measure CAN‑H and CAN‑L voltages at the module connector. Compare to expected values. Use oscilloscope to view waveform integrity and noise if available.
- With power off, measure termination resistance across CAN‑H and CAN‑L near the fault and at multiple points to locate opens or incorrect termination.
- Isolate sections of the bus by disconnecting downstream modules one at a time while observing network traffic to localize the fault to a module or wiring section.
- If a specific module is found not to transmit but has proper power/ground, attempt module reset/reprogramming per manufacturer procedure or replace module if software/hardware confirmed faulty.
- After repairs, clear codes, perform a functional test and a drive cycle or emissions readiness confirmation. Monitor for reoccurrence.
- Safety note: take anti‑static precautions and disconnect battery when performing connector repairs; use manufacturer procedures for module programming.
Likely causes
- Damaged CAN‑H/CAN‑L wiring near emissions module or common splice
- Faulty ECM/PCM not transmitting required emissions messages
- Loose or corroded power/ground at emissions module or gateway
- Failed gateway or bus transceiver on module preventing message relay
- Low battery voltage during module reprogramming left module offline
- Short circuit between CAN lines or to chassis/battery
Fault status
Status
Lost communication with emissions‑critical control module(s). Required emissions data/messages not received on vehicle network. DTC stored; inspect network, power/ground, and module.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 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.
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