OBD Guide
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B1274

Servo Motor Potentiometer Vent Circuit Short To Battery

B1274 is an OBD-II diagnostic trouble code meaning: Servo Motor Potentiometer Vent Circuit Short To Battery. Common causes: short circuit in wiring harness, servo potentiometer fault. Estimated repair cost: $56–167.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–167 (est.)

Symptoms

  • Incorrect operation of the ventilation system
  • Check Engine Light Illuminates
  • Floating idle speed
  • Problems with the EVAP system

Causes

  • Short circuit in wiring harness
  • Servo potentiometer fault
  • Oxidation of contacts
  • ECU damage

How to Fix

  1. Check the integrity of the wiring harness
  2. Measure the resistance of the potentiometer
  3. Check contacts for oxidation
  4. Replace the faulty component (potentiometer or servo)

Related codes

P0440P0441P0446

FAQ

What does the B1274 code mean?

B1274 is an OBD-II diagnostic trouble code that indicates: Servo Motor Potentiometer Vent Circuit Short To Battery

What causes a B1274 error code?

The most common causes of B1274 include: Short circuit in wiring harness; Servo potentiometer fault; Oxidation of contacts; ECU damage.

How do I fix a B1274 diagnostic trouble code?

To fix B1274: Check the integrity of the wiring harness. Measure the resistance of the potentiometer. Check contacts for oxidation. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1274?

Limited driving only, diagnose soon

How much does it cost to fix B1274?

The estimated repair cost for B1274 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat