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Home / DTC / U0113 — Lost Communication With Emissions Critical Control Information

U0113 — Lost Communication With Emissions Critical Control Information

Detailed page for trouble code U0113.

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U0113

Generic U — Network/User

Lost Communication With Emissions Critical Control Information

Brand: Generic
Type: U — Network/User
Views: UK: 18 EN: 22 RU: 19
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Page language: EN

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

  1. Record all codes and freeze frame data. Note any other U‑codes present.
  2. Verify good battery voltage and charging. Replace or recharge battery if low and clear codes, then recheck.
  3. Inspect connectors and wiring at emissions module(s), gateway, and common splice points for corrosion, pin damage, or loose terminals.
  4. With ignition ON, attempt to communicate with the emissions module using a capable scan tool. If no communication, move to electrical checks.
  5. Check for power and ground at the emissions module connector(s). Backprobe to confirm constant and switched power as applicable and reliable ground.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. After repairs, clear codes, perform a functional test and a drive cycle or emissions readiness confirmation. Monitor for reoccurrence.
  11. 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

U0100 U0101 U0115 U0121 U0140 U0073
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