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Home / DTC / U0103 — Lost communication with the gear shift module

U0103 — Lost communication with the gear shift module

Detailed page for trouble code U0103.

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59brands
10,557generic
22,461specific
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U0103

LAND ROVER U — Network/User

Lost communication with the gear shift module

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 6 EN: 24 RU: 21
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Page language: EN

Causes

  • Open or short in CAN bus wiring (CANH/CANL) to the gear shift module
  • Faulty gear shift module (internal failure)
  • Poor or missing power supply or ground to the gear shift module (blown fuse, relay, connector)
  • Corroded, damaged or disconnected connector at the gear shift module
  • Faulty gateway, body control module or transmission control module interfering with bus messages
  • Bus termination or wiring harness damage (water ingress, chafing)

Symptoms

  • Shift selector inoperative or intermittent
  • Transmission enters limp mode or cannot shift out of Park
  • Transmission or gearbox warning lamp/message on instrument cluster
  • Gear selection not indicated on dash or incorrect gear displayed
  • Multiple network modules showing 'no communication' or related U-codes
  • Vehicle may not move or may only start in limited gear

What to check

  • Read fault memory and freeze frame data with a compatible scan tool; note which other modules report missing communication
  • Check for related U-codes on other modules (gateway/TCM/BCM)
  • Visual inspection: check the gear shift module connectors and wiring for corrosion, damage, water ingress or loose pins
  • Check fuses and relays supplying the gear shift module and associated circuits
  • Measure module supply voltage and ground at the connector (key ON)
  • Using a multimeter/oscilloscope, measure CANH and CANL voltages with key ON and engine OFF (see signal parameters)

Signal parameters

  • CAN bus idle common-mode: each line approx. 2.5 V (CANH ≈2.5 V, CANL ≈2.5 V)
  • Dominant bus state: CANH ≈3.5 V, CANL ≈1.5 V (differential ≈2.0 V)
  • Termination resistance: approx. 60 Ω across CANH–CANL (with ignition OFF)
  • Message presence: gear shift module should periodically transmit identifiable CAN frames — verify presence/absence with a diagnostic tool or oscilloscope

Diagnostic algorithm

  1. Connect a diagnostic scan tool and record U0103 plus any other U-codes or related module statuses. Verify if the gear shift module appears on the network.
  2. Check fuses/relays and visually inspect the gear shift module connector and harness for damage, corrosion, water intrusion or bent pins. Repair or reseat connector if necessary.
  3. With key ON (engine OFF), verify module supply voltage and ground at the module connector. Repair supply or ground faults before further network testing.
  4. Measure CANH and CANL voltages at the module connector. Compare to expected signal parameters. If voltages are incorrect, trace power/ground or short conditions.
  5. With ignition OFF, measure resistance across CANH–CANL at the module connector and at convenient harness splice points. Expect ~60 Ω. Large deviations indicate missing termination or short/open.
  6. Use a scan tool to monitor CAN traffic. If the module sends no messages but other modules are communicating, suspect the module itself or its local wiring. If multiple nodes are missing, troubleshoot gateway/termination or common harness circuits.
  7. Isolate segments: disconnect other nodes or unplug nearby modules to locate short/overload. Perform wiggle tests while monitoring bus for intermittent faults.
  8. If wiring and network are OK and module has supply/ground but still fails to communicate, consider module replacement/testing per manufacturer procedure. Ensure correct programming and VIN coding after replacement.
  9. After any repair, clear codes and perform a road/operation test to confirm the gear shift module communicates reliably and related symptoms are resolved. Check for any required module reprogramming or relearns.
  10. If unsure, obtain manufacturer wiring diagrams, pinouts and published diagnostics/TSBs; consider oscilloscope capture to visualize communication waveforms.

Likely causes

  • Blown fuse or poor pin contact at the gear shift module power feed
  • Bent/corroded pins or contaminated connectors at the shifter module
  • Damaged CAN pair in harness near the gear selector (pinch/rodent/wear)
  • Failed gear shift module electronics
  • Faulty gateway/module that routes between CAN buses or isolates the gear module

Fault status

⚠️ Status
U0103 — Lost communication with the gear shift module (module not responding on CAN bus). Check wiring, power/ground, connectors, and module presence on network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

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