OBD Guide
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C1748

Switch Input Circuit Short To Ground

C1748 is an OBD-II diagnostic trouble code meaning: Switch Input Circuit Short To Ground. Common causes: damage to the wiring harness (harness), short circuit in switch circuit. Estimated repair cost: $33–111.

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

Symptoms

  • Switch related system malfunction
  • Check Engine Light Is On
  • Failures in car electronics

Causes

  • Damage to the wiring harness (harness)
  • Short circuit in switch circuit
  • Switch failure
  • Short circuit to ground

How to Fix

  1. Check wiring harness for damage
  2. Check the continuity of the switch circuit
  3. Replace damaged harness or switch
  4. Reset the error and check for recurrence

Related codes

C1747C1749

FAQ

What does the C1748 code mean?

C1748 is an OBD-II diagnostic trouble code that indicates: Switch Input Circuit Short To Ground

What causes a C1748 error code?

The most common causes of C1748 include: Damage to the wiring harness (harness); Short circuit in switch circuit; Switch failure; Short circuit to ground.

How do I fix a C1748 diagnostic trouble code?

To fix C1748: Check wiring harness for damage. Check the continuity of the switch circuit. Replace damaged harness or switch. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1748?

Limited driving only, diagnose soon

How much does it cost to fix C1748?

The estimated repair cost for C1748 is $33–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat