OBD Guide
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B1721

Seat Driver Rearward Switch Circuit Failure

B1721 is an OBD-II diagnostic trouble code meaning: Seat Driver Rearward Switch Circuit Failure. Common causes: open or short circuit in wiring harness, faulty seat position switch. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Driver's seat position memory does not work
  • Seat won't move back
  • Malfunction indicator on the instrument panel

Causes

  • Open or short circuit in wiring harness
  • Faulty seat position switch
  • Problems with the seat control unit
  • Contact corrosion

How to Fix

  1. Check the integrity of the wiring harness to the switch
  2. Check switch resistance
  3. Inspect contacts for corrosion
  4. If necessary, replace the switch or control unit

Related codes

B1720B1722B1710

FAQ

What does the B1721 code mean?

B1721 is an OBD-II diagnostic trouble code that indicates: Seat Driver Rearward Switch Circuit Failure

What causes a B1721 error code?

The most common causes of B1721 include: Open or short circuit in wiring harness; Faulty seat position switch; Problems with the seat control unit; Contact corrosion.

How do I fix a B1721 diagnostic trouble code?

To fix B1721: Check the integrity of the wiring harness to the switch. Check switch resistance. Inspect contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1721?

Yes, but get it checked soon

How much does it cost to fix B1721?

The estimated repair cost for B1721 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat