OBD Guide
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B144C

Inverted Run/Start Power Relay Circuit

B144C is an OBD-II diagnostic trouble code meaning: Inverted Run/Start Power Relay Circuit. Common causes: faulty start/run relay, 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

  • Engine won't start
  • Problems with engine idling
  • Check Engine Light Is On

Causes

  • Faulty start/run relay
  • Open or short circuit in wiring harness
  • Poor circuit grounding
  • Problems with the engine control unit (ECU)

How to Fix

  1. Check the status of the start/run relay
  2. Inspect the wiring harness for damage
  3. Check circuit grounding
  4. Test the engine control unit (ECU)

Related codes

B144DB144EP0685

FAQ

What does the B144C code mean?

B144C is an OBD-II diagnostic trouble code that indicates: Inverted Run/Start Power Relay Circuit

What causes a B144C error code?

The most common causes of B144C include: Faulty start/run relay; Open or short circuit in wiring harness; Poor circuit grounding; Problems with the engine control unit (ECU).

How do I fix a B144C diagnostic trouble code?

To fix B144C: Check the status of the start/run relay. Inspect the wiring harness for damage. Check circuit grounding. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B144C?

Limited driving only, diagnose soon

How much does it cost to fix B144C?

The estimated repair cost for B144C is $56–167. Actual cost depends on your vehicle, location, and labor rates.

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