OBD Guide
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B1440

Power Mode Master Input Circuits Mismatch

B1440 is an OBD-II diagnostic trouble code meaning: Power Mode Master Input Circuits Mismatch. Common causes: wiring harness damage, malfunction of power mode sensors. Estimated repair cost: $56–167.

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

Symptoms

  • Unstable engine operation
  • Problems starting the engine
  • Check Engine Light Is On

Causes

  • Wiring harness damage
  • Malfunction of power mode sensors
  • Contact corrosion
  • Relay or fuse problems
  • ECU malfunction

How to Fix

  1. Check wiring harness for damage
  2. Check power mode sensors
  3. Clean contacts from corrosion
  4. Check relays and fuses
  5. Test ECU

Related codes

P0600P0601P0602

FAQ

What does the B1440 code mean?

B1440 is an OBD-II diagnostic trouble code that indicates: Power Mode Master Input Circuits Mismatch

What causes a B1440 error code?

The most common causes of B1440 include: Wiring harness damage; Malfunction of power mode sensors; Contact corrosion; Relay or fuse problems.

How do I fix a B1440 diagnostic trouble code?

To fix B1440: Check wiring harness for damage. Check power mode sensors. Clean contacts from corrosion. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1440?

Limited driving only, diagnose soon

How much does it cost to fix B1440?

The estimated repair cost for B1440 is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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