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Home / DTC / B2626 — Body Control Module — CAN Communication Error

B2626 — Body Control Module — CAN Communication Error

Detailed page for trouble code B2626.

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Code

B2626

LAND ROVER B — Body

Body Control Module — CAN Communication Error

Brand: LAND ROVER
Type: B — Body
Views: UK: 7 EN: 15 RU: 11
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Page language: EN

Causes

  • Faulty BCM (internal failure or firmware error)
  • Open, shorted or intermittent CAN_H / CAN_L wiring
  • Poor power supply or missing ground to the BCM
  • Missing or incorrect termination resistor(s) on the CAN bus
  • Corroded/damaged connectors or water intrusion at the BCM or other nodes
  • Another module holding the bus in a dominant state (short to ground/power)

Symptoms

  • Loss of functions controlled via BCM (central locking, lighting, windows, etc.)
  • Warning lights or communication fault messages on instrument cluster
  • Inability to communicate with BCM with diagnostic tool
  • Intermittent electrical features or complete failure of body systems
  • Possible complete CAN bus inactivity or erratic network behavior

What to check

  • Read all stored and pending DTCs and freeze frame with a manufacturer-level scan tool
  • Attempt to establish a live communication session with the BCM via the diagnostic tool
  • Visually inspect BCM connector(s) and wiring for corrosion, damage, or moisture
  • Check BCM power and ground circuits (fuses, fusible links, battery connections)
  • Measure CAN_H and CAN_L voltages at the BCM with ignition ON (key ON, engine OFF)
  • Check termination resistance across CAN_H and CAN_L (~60 ohms total on most networks)

Signal parameters

  • Ignition ON: CAN_H ≈ 2.5 V (recessive) and CAN_L ≈ 2.5 V; differential ≈ 0 V when idle
  • Dominant state: CAN_H ≈ 3.5 V and CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
  • Termination resistance across CAN_H–CAN_L ≈ 60 ohms (two 120 ohm terminators in parallel)
  • Typical CAN bus bit rates encountered: 125 kbps, 250 kbps or 500 kbps (verify vehicle-specific rate)
  • Supply voltage to BCM: nominal vehicle battery voltage (~12–14.5 V) with key ON
  • Ground resistance: low, typically

Diagnostic algorithm

  1. Record all DTCs and freeze-frame data. Note whether B2626 is current or intermittent and any related codes (U- or B-series).
  2. Attempt to communicate with the BCM using a factory-level scan tool. Note connection failure messages and timeouts.
  3. Visually inspect BCM connector, pins and harness for corrosion, bent pins, water ingress, or heat damage. Repair or clean as necessary.
  4. Check BCM power and ground circuits: verify fuses, battery connection, and ground continuity to chassis.
  5. Check CAN wiring continuity and shorts: measure resistance from BCM CAN_H and CAN_L to other known nodes and to chassis/power for shorts.
  6. Measure DC voltages at BCM CAN pins with ignition ON: verify recessive levels ~2.5 V each. If levels are incorrect, trace for open supply, short, or dominant node.
  7. Use an oscilloscope or CAN bus monitor to observe waveform quality while exercising network messages; look for bus-off, excessive errors, or one line stuck dominant.
  8. If a single module is suspected of pulling the bus off, disconnect modules one at a time (where serviceable) to see if bus returns to normal.
  9. If wiring, connectors, fuses and other modules check OK, consider BCM software reflash or replacement per manufacturer procedure. Re-program/configure replacement BCM if fitted.
  10. After repair, clear all DTCs, perform full network scan, and verify normal operation of body systems and that the CAN bus remains stable over a test drive.

Likely causes

  • Loose, corroded or damaged BCM connector or pins
  • Open or shorted CAN bus wiring near the BCM
  • Blown fuse or poor battery connection feeding BCM
  • Failed BCM hardware or corrupted software
  • Failed module elsewhere on the same CAN circuit pulling the bus off

Fault status

⚠️ Status
BCM detected CAN communication error — expected CAN messages not received or CAN bus in fault condition.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

U0073 U0100 U0121 B2620 B2625
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