OBD Guide
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B1001

Diagnosis Sensor Unit

B1001 is an OBD-II diagnostic trouble code meaning: Diagnosis Sensor Unit. Common causes: wiring harness damage, corrosion of contacts in connectors. Estimated repair cost: $33–167.

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

Symptoms

  • SRS/airbag indicator is on
  • SRS does not activate during diagnostics
  • Errors in related systems (for example, pretensioners)

Causes

  • Wiring harness damage
  • Corrosion of contacts in connectors
  • Diagnostic unit software failure
  • Malfunction of the unit itself (rarely)

How to Fix

  1. Read error codes with SRS scanner
  2. Check the integrity of the wiring harness and connectors
  3. Clean contacts from corrosion
  4. Reflash the diagnostic unit (if possible)
  5. Replace Diagnosis Sensor Unit if necessary

Related codes

B1000B1002B1010

FAQ

What does the B1001 code mean?

B1001 is an OBD-II diagnostic trouble code that indicates: Diagnosis Sensor Unit

What causes a B1001 error code?

The most common causes of B1001 include: Wiring harness damage; Corrosion of contacts in connectors; Diagnostic unit software failure; Malfunction of the unit itself (rarely).

How do I fix a B1001 diagnostic trouble code?

To fix B1001: Read error codes with SRS scanner. Check the integrity of the wiring harness and connectors. Clean contacts from corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1001?

Limited driving only, diagnose soon

How much does it cost to fix B1001?

The estimated repair cost for B1001 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat