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Home / DTC / U1103 — Lost Communication With TGS Lever

U1103 — Lost Communication With TGS Lever

Detailed page for trouble code U1103.

34,405codes
59brands
11,914generic
22,491specific
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Code

U1103

HYUNDAI U — Network/User

Lost Communication With TGS Lever

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or disconnected wiring between TGS lever and control module
  • Corroded or loose connector pins at TGS lever or harness junctions
  • Blown fuse or lost power/ground to the TGS circuit
  • Faulty TGS lever sensor or internal module failure
  • CAN/LIN bus fault or high bus error rate (short to ground/voltage, open, or excessive interference)
  • Intermittent wiring fault (chafing, pinched cable)

Symptoms

  • Malfunction Indicator Light (MIL) or network warning may illuminate
  • Loss of TGS-related functionality (gear/shift/transfer operation limited or in limp mode)
  • Transmission or shift lever may not respond or may default to a safe gear
  • Intermittent or permanent faults stored in other modules that rely on TGS data
  • Possible erratic or frozen lever position reading in live data

What to check

  • Read all current and stored network and module DTCs with a capable scan tool; capture freeze frame and event history
  • Verify battery voltage is within specification (typically 12–14.5 V) before diagnostics
  • Inspect relevant fuses and power distribution for TGS and related modules
  • Visually inspect connectors and wiring at the TGS lever assembly and associated junctions for corrosion, damage, or loose pins
  • Check grounds for tightness and corrosion at chassis and module ground points
  • Use scan tool to view live data: TGS lever position/availability and network message presence

Signal parameters

  • Power supply: typically battery voltage when key on (approx. 12 V) to module Vb circuit
  • Ground: near 0 V with good chassis ground
  • Analog position sensor (if applicable): variable voltage ~0.5–4.5 V across lever travel (model-dependent)
  • Digital bus: CAN BUS differential idle ~2.5 V on both CAN H and CAN L (CAN H ~2.5–3.5 V, CAN L ~1.5–2.5 V)
  • Message rate: TGS messages expected at regular intervals (tens to hundreds of milliseconds) — absence or high error rate indicates communication loss
  • Resistance: continuity between connector pins and module should be low (near 0 ohms) with no short to ground or battery

Diagnostic algorithm

  1. Connect a compatible scan tool; record U1103 and any related codes and freeze-frame data
  2. Verify battery voltage; if low, charge battery before continuing
  3. Inspect fuses and power/ground at the fuse box and at the TGS module/lever connector
  4. Visually inspect TGS lever connector and wiring for damage, corrosion, bent pins; disconnect and inspect mating surfaces
  5. With ignition ON, monitor live data for TGS lever position and network status. Note if data is absent or intermittent
  6. Measure supply voltage and ground at the TGS connector with a multimeter. If supply or ground missing, trace and repair power/ground circuit
  7. If the TGS uses an analog sensor, backprobe signal wire and measure voltage across lever travel; compare to expected range. If out of range, suspect sensor or wiring
  8. If the TGS communicates over CAN/LIN, measure bus voltages at a known good connector and at the TGS connector; check for shorts or opens and compare to expected idle voltages
  9. Perform continuity and short-to-power/ground tests on the harness between the TGS and the controlling module; repair any opens or shorts
  10. If wiring and power/ground are good but communication is lost, swap or bench-test the TGS lever module if a bench procedure exists, or substitute a known-good module where possible
  11. Check for software updates or technical service bulletins; reflash/update module software when recommended
  12. After repairs, clear codes and confirm normal operation by monitoring live data and performing a functional test/road test. Re-scan for returned codes

Likely causes

  • Connector corrosion or bent pins at TGS lever
  • Broken/shorted wire in harness to transmission/shift lever area
  • No supply voltage or poor ground to TGS module
  • Failed TGS lever position sensor
  • Local CAN/LIN wiring short or open causing message loss

Fault status

⚠️ Status
Lost Communication With TGS Lever — the control network is not receiving expected messages or signals from the TGS lever assembly. This can be caused by wiring/connectivity issues, failed sensor/module, or bus faults.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

U0100 U0121 U0140 U1100 U1101 U1110
371

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