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Home / DTC / U017E — Communication lost with the pre-tensioner of seat belt 'A'

U017E — Communication lost with the pre-tensioner of seat belt 'A'

Detailed page for trouble code U017E.

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Code

U017E

LAND ROVER U — Network/User

Communication lost with the pre-tensioner of seat belt 'A'

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 2 EN: 12 RU: 4
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Page language: EN

Causes

  • Open, short or intermittent wiring/connectors between pretensioner and SRS/module
  • Corroded or disconnected connector at the pretensioner (under seat) or SRS control module
  • Damaged harness at seat flex points (seat track/slide area)
  • Blown related fuse or poor power/ground to pretensioner/module
  • Faulty seat belt pretensioner module or SRS/airbag control module
  • CAN/LIN bus fault (bus-off, high/low short, termination issue) or multiple module failures

Symptoms

  • SRS/airbag warning lamp illuminated on instrument cluster
  • Diagnostic tool reports U017E (and possibly other SRS/CAN communication codes)
  • Seat belt pretensioner may not arm or may not fire during a deploy event
  • Possible loss of other seat-related functions (seatbelt buckle sensor, occupancy sensor) if on same harness

What to check

  • Read and record all DTCs and freeze frame data with a capable SRS diagnostic scan tool
  • Verify battery voltage is stable (measure with engine off) before diagnostics
  • Visually inspect connectors at the pretensioner (under seat) and SRS/airbag control module for corrosion, damage or loose pins
  • Inspect harness at seat hinge/slide for chafing or broken conductors; perform wiggle test while monitoring communication
  • Check related fuses and power/ground signals to the pretensioner/module
  • Scan CAN/LIN bus for bus errors or other nodes showing comm faults; check for other U-codes

Signal parameters

  • Presence of seatbelt pretensioner module address/messages on the CAN bus (module should poll/respond at defined intervals)
  • CAN bus idle voltages ~2.5 V on CAN_H and CAN_L (differential ~0 V idle), dominant state behavior under load — verify with scope
  • Message frequency/intervals for pretensioner module as shown by OEM scan tool (compare to known-good pattern)
  • 12 V supply and ground at pretensioner connector with ignition on (verify stable voltage)
  • Continuity/resistance of pretensioner squib circuit measured per OEM specification (perform only with battery disconnected and following safety precautions)
  • SRS module power/ignition input signals present when key on

Diagnostic algorithm

  1. Use an OEM-capable SRS diagnostic scanner to read and log all codes and freeze frame data; note related U-codes.
  2. Verify battery condition and voltage; charge if low and re-check codes after stable supply.
  3. Visually inspect connectors and wiring at the affected seat pretensioner and at the airbag control module; look for corrosion, bent pins, water ingress, or pin push-out.
  4. With ignition on, use the scan tool to monitor the presence/timeout of the pretensioner module on the bus while performing a gentle wiggle test of the seat harness and seat movement to reproduce the fault.
  5. Check fuses, power and ground for the SRS and pretensioner circuits. Repair any power/ground issues before further testing.
  6. If bus issues are suspected, use an oscilloscope or high-quality CAN tester to observe CAN_H/CAN_L for noise, missing nodes, or bus-off conditions. Repair short/open/termination faults as required.
  7. For suspected squib wiring faults, disconnect the battery negative and wait the manufacturer-specified time. Then measure continuity/resistance of the squib circuit per OEM procedure. Do not attempt continuity checks with the battery connected.
  8. If wiring and connectors test good, follow OEM procedures to reprogram/initialize or replace the pretensioner module or SRS control module. Ensure correct module coding and perform SRS system checks/initialization after replacement.
  9. Clear codes and perform a road/ignition cycle and SRS system check; verify the U017E does not return and the SRS lamp behavior is normal.
  10. If intermittent or not reproducible, document events, inspect for recent service that may have disturbed connectors, and consider harness repair or module replacement if fault history supports it.

Likely causes

  • Corroded/damaged connector at seat pretensioner due to moisture or wear
  • Broken wires in harness at seat hinge/slide (most common on vehicles with powered seats)
  • Faulty or unpowered pretensioner module (connector pin damage or internal failure)
  • Local CAN communication fault (intermittent bus wiring or missing termination)
  • Recent seat removal/installation or module replacement without proper coding

Fault status

⚠️ Status
Lost communication with seat belt pretensioner 'A' — SRS control does not receive/respond to module messages. Check pretensioner wiring, connector, power/ground, and CAN bus integrity.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

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