OBD Guide
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B2547

Luggage Room Junction Block ECU Communication Stop

B2547 is an OBD-II diagnostic trouble code meaning: Luggage Room Junction Block ECU Communication Stop. Common causes: break or damage to the can/lin data bus in the trunk area, faulty luggage compartment mounting block. Estimated repair cost: $22–222.

Severity
⚠️ Medium
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$22–222 (est.)

Symptoms

  • Trunk lid lock does not work
  • Failure of rear lights (brake lights, reverse lights)
  • Heated rear window does not work
  • No connection with connection block during diagnostics
  • The rear view camera or parking sensors do not function

Causes

  • Break or damage to the CAN/LIN data bus in the trunk area
  • Faulty luggage compartment mounting block
  • Failure of power supply or grounding of the connection block
  • Moisture ingress into the connection block (damaged seals)
  • Damage to the wiring harness in the trunk lid hinge

How to Fix

  1. Read all error codes and determine which rear end systems are not working
  2. Check the power and grounding of the luggage compartment mounting block
  3. Inspect the wiring harness in the trunk lid hinge for fractures and damage.
  4. Check the connectors of the connection block for moisture and oxidation
  5. Measure the voltage on the CAN/LIN bus in the area of the connection block
  6. If the unit is faulty, replace the luggage compartment mounting block

Related codes

B2545B2546B2548U0140

FAQ

What does the B2547 code mean?

B2547 is an OBD-II diagnostic trouble code that indicates: Luggage Room Junction Block ECU Communication Stop

What causes a B2547 error code?

The most common causes of B2547 include: Break or damage to the CAN/LIN data bus in the trunk area; Faulty luggage compartment mounting block; Failure of power supply or grounding of the connection block; Moisture ingress into the connection block (damaged seals).

How do I fix a B2547 diagnostic trouble code?

To fix B2547: Read all error codes and determine which rear end systems are not working. Check the power and grounding of the luggage compartment mounting block. Inspect the wiring harness in the trunk lid hinge for fractures and damage.. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2547?

Do not drive — repair immediately

How much does it cost to fix B2547?

The estimated repair cost for B2547 is $22–222. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat