OBD Guide
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B1243

GSW Terminal Circuit Malfunction

B1243 is an OBD-II diagnostic trouble code meaning: GSW Terminal Circuit Malfunction. Common causes: open or short circuit in gsw circuit, poor contact in the sensor connector. Estimated repair cost: $33–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$33–111 (est.)

Symptoms

  • Deterioration of vehicle dynamics
  • Floating idle speed
  • Engine transition to emergency mode
  • Check Engine Light Illuminates

Causes

  • Open or short circuit in GSW circuit
  • Poor contact in the sensor connector
  • Throttle Position Sensor Malfunction
  • Wiring Harness Problems
  • Engine ECU malfunction

How to Fix

  1. Check the continuity of the GSW circuit using a multimeter
  2. Inspect the connectors and contacts of the sensor for oxidation or damage
  3. Check the resistance of the throttle position sensor
  4. If necessary, replace the sensor or restore the integrity of the circuit
  5. Clear the error and check if it returns after a test drive

Related codes

P0120P0121P0122P0123

FAQ

What does the B1243 code mean?

B1243 is an OBD-II diagnostic trouble code that indicates: GSW Terminal Circuit Malfunction

What causes a B1243 error code?

The most common causes of B1243 include: Open or short circuit in GSW circuit; Poor contact in the sensor connector; Throttle Position Sensor Malfunction; Wiring Harness Problems.

How do I fix a B1243 diagnostic trouble code?

To fix B1243: Check the continuity of the GSW circuit using a multimeter. Inspect the connectors and contacts of the sensor for oxidation or damage. Check the resistance of the throttle position sensor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1243?

Limited driving only, diagnose soon

How much does it cost to fix B1243?

The estimated repair cost for B1243 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat