OBD Guide
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B144B

Run/Crank Power Relay Circuit

B144B is an OBD-II diagnostic trouble code meaning: Run/Crank Power Relay Circuit. Common causes: faulty run/crank relay, open or short circuit in the relay circuit. Estimated repair cost: $22–111.

Severity
🔴 High
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Engine won't start
  • The engine stalls while driving
  • Unstable engine operation
  • No power to fuel pump
  • Check Engine Light Is On

Causes

  • Faulty Run/Crank relay
  • Open or short circuit in the relay circuit
  • Oxidation of relay contacts
  • Problems with the fuse block
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check the condition of the Run/Crank relay (visual inspection, testing)
  2. Check the voltage at the relay contacts with the ignition on
  3. Check the integrity of the wiring harness going to the relay
  4. Clean relay contacts and connector
  5. Replace relay if necessary
  6. Check fuses associated with this circuit
  7. Scan the ECU for additional errors

Related codes

B144AB144CP0685P0686P0641

FAQ

What does the B144B code mean?

B144B is an OBD-II diagnostic trouble code that indicates: Run/Crank Power Relay Circuit

What causes a B144B error code?

The most common causes of B144B include: Faulty Run/Crank relay; Open or short circuit in the relay circuit; Oxidation of relay contacts; Problems with the fuse block.

How do I fix a B144B diagnostic trouble code?

To fix B144B: Check the condition of the Run/Crank relay (visual inspection, testing). Check the voltage at the relay contacts with the ignition on. Check the integrity of the wiring harness going to the relay. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B144B?

Yes, but get it checked soon

How much does it cost to fix B144B?

The estimated repair cost for B144B is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat