OBD Guide
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B2728

Sonar System Off Switch

B2728 is an OBD-II diagnostic trouble code meaning: Sonar System Off Switch. Common causes: faulty parking sensor switch, open or shorted wiring harness. Estimated repair cost: $33–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Parking sensors do not work
  • Malfunction indicator on the dashboard
  • The parking sensor system does not activate

Causes

  • Faulty parking sensor switch
  • Open or shorted wiring harness
  • Poor contact in the switch connector
  • Problems with power or grounding of the circuit
  • Control unit software failure

How to Fix

  1. Check the functionality of the parking sensor switch
  2. Inspect the wiring harness and connectors for damage
  3. Check the integrity of the circuit and contacts
  4. Measure voltage and resistance in the circuit
  5. If necessary, replace the switch or repair the harness
  6. Reset the error and check the system operation

Related codes

B2727B2729U0155

FAQ

What does the B2728 code mean?

B2728 is an OBD-II diagnostic trouble code that indicates: Sonar System Off Switch

What causes a B2728 error code?

The most common causes of B2728 include: Faulty parking sensor switch; Open or shorted wiring harness; Poor contact in the switch connector; Problems with power or grounding of the circuit.

How do I fix a B2728 diagnostic trouble code?

To fix B2728: Check the functionality of the parking sensor switch. Inspect the wiring harness and connectors for damage. Check the integrity of the circuit and contacts. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2728?

Limited driving only, diagnose soon

How much does it cost to fix B2728?

The estimated repair cost for B2728 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat