OBD Guide
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C140B

Transfer Case Motor Performance Circuit Low

C140B is an OBD-II diagnostic trouble code meaning: Transfer Case Motor Performance Circuit Low. Common causes: poor contact in wiring harness, transfer case motor malfunction. Estimated repair cost: $56–167.

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

Symptoms

  • Unstable all-wheel drive operation
  • Check engine light comes on
  • Transfer case won't shift

Causes

  • Poor contact in wiring harness
  • Transfer case motor malfunction
  • Problems with the control unit
  • Open or short circuit in the circuit

How to Fix

  1. Check control circuit voltage
  2. Inspect the wiring harness for damage
  3. Check the operation of the transfer case motor
  4. Replace faulty components

Related codes

C140AC140C

FAQ

What does the C140B code mean?

C140B is an OBD-II diagnostic trouble code that indicates: Transfer Case Motor Performance Circuit Low

What causes a C140B error code?

The most common causes of C140B include: Poor contact in wiring harness; Transfer case motor malfunction; Problems with the control unit; Open or short circuit in the circuit.

How do I fix a C140B diagnostic trouble code?

To fix C140B: Check control circuit voltage. Inspect the wiring harness for damage. Check the operation of the transfer case motor. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C140B?

Limited driving only, diagnose soon

How much does it cost to fix C140B?

The estimated repair cost for C140B is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat