OBD Guide
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C1440

Pressure Transducer Main/Primary Signal Faulted

C1440 is an OBD-II diagnostic trouble code meaning: Pressure Transducer Main/Primary Signal Faulted. Common causes: pressure sensor malfunction, open or short circuit in wiring harness. Estimated repair cost: $56–167.

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

Symptoms

  • Check Engine light comes on
  • Reduced braking system efficiency
  • Unstable engine operation
  • Problems with the ABS or ESP system

Causes

  • Pressure sensor malfunction
  • Open or short circuit in wiring harness
  • Problems with the control unit
  • Contact corrosion

How to Fix

  1. Check the pressure sensor for damage
  2. Check the wiring harness for breaks and short circuits
  3. Check contacts for corrosion
  4. Replace pressure sensor if necessary
  5. Test the system after repair

Related codes

C1441C1442P0106

FAQ

What does the C1440 code mean?

C1440 is an OBD-II diagnostic trouble code that indicates: Pressure Transducer Main/Primary Signal Faulted

What causes a C1440 error code?

The most common causes of C1440 include: Pressure sensor malfunction; Open or short circuit in wiring harness; Problems with the control unit; Contact corrosion.

How do I fix a C1440 diagnostic trouble code?

To fix C1440: Check the pressure sensor for damage. Check the wiring harness for breaks and short circuits. Check contacts for corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with C1440?

Limited driving only, diagnose soon

How much does it cost to fix C1440?

The estimated repair cost for C1440 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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