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Home / DTC / U2611 — A slave ECU D2B failed to receive a command from alarm cleaning

U2611 — A slave ECU D2B failed to receive a command from alarm cleaning

Detailed page for trouble code U2611.

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Code

U2611

LAND ROVER U — Network/User

A slave ECU D2B failed to receive a command from alarm cleaning

Brand: LAND ROVER
Type: U — Network/User
AI status
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Page language: EN

Causes

  • Open, short or high resistance in D2B network wiring or connectors
  • Poor power or ground to the slave ECU (module not powered or in sleep)
  • Faulty slave ECU or master ECU transceiver
  • Software/configuration mismatch or corrupted module programming
  • Intermittent connection caused by corrosion, water ingress or damaged connector
  • Related fuse or supply circuit fault

Symptoms

  • Stored U2611 DTC / communications fault message
  • Alarm-related features do not clear or behave erratically
  • Warning or fault indicator on dash related to body/alarm systems
  • Intermittent operation of equipment controlled via the slave ECU
  • Other network modules showing related communication errors

What to check

  • Read all modules with a capable scan tool; note related U-codes and freeze frame data
  • Check vehicle battery voltage and main supplies; verify fuses for affected modules
  • Visually inspect D2B harness, connectors and grounds for corrosion, damage or looseness
  • Check for presence of the 'alarm cleaning' message on the D2B bus with a diagnostic tool or scope while exercising the function
  • Verify slave ECU receives 12V supply and a good ground
  • Inspect for water ingress or physical damage to modules and connectors

Signal parameters

  • Presence of the 'alarm cleaning' command frame on the D2B network when function is activated
  • Expected acknowledgement/response frame from the slave ECU within the normal response window
  • Bus activity when function is commanded (bus should show frames; if silent, master not sending or bus fault)
  • Module supply voltage at the time of command (battery 11–14 V nominal)
  • Continuity of D2B shield/return where applicable and integrity of connector pins

Diagnostic algorithm

  1. Use a full-system scan tool to record U2611 and any related codes; note module addressing and timestamps.
  2. Confirm battery voltage and inspect fuses/power feeds for both master and slave ECUs.
  3. Visually inspect connectors and harness runs between master and slave for corrosion, damage or poor seating; reseat connectors.
  4. With ignition in the correct state, have an assistant operate the alarm cleaning function while monitoring the D2B bus with a diagnostic tool or oscilloscope to confirm the command is transmitted and whether a response is received.
  5. If the master transmits but no slave response, check power/ground at the slave ECU; measure supply voltages and grounds with the module connected.
  6. Perform continuity and short tests on D2B bus wiring between master and slave (check for opens, shorts to ground or battery).
  7. If wiring and supplies are good, attempt module wake/rehabilitation procedures or reprogram/reflash software per manufacturer service information.
  8. If fault persists after software update and wiring is confirmed good, replace the slave ECU and verify correct operation; clear codes and retest.
  9. After repair, road-test or exercise alarm system multiple times to confirm repeatability and stability; monitor for reappearance of U2611.

Likely causes

  • Corroded or loose connector at the slave ECU or harness (most common)
  • Slave ECU is not powered (fuse, supply wiring, or onboard failure)
  • Damaged D2B bus wiring between master and slave (chafing, broken wires)
  • Faulty slave ECU communication transceiver
  • Software mismatch or failed module wake-up preventing message reception

Fault status

⚠️ Status
Slave ECU on the D2B network did not receive the expected alarm cleaning command from the sending module. Communication between master and slave is failing or the slave is not powered/awake.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

U0100 U0140 U0155 U0121
295

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