OBD Guide
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B2620

ECU Power Source Circuit Malfunction

B2620 is an OBD-II diagnostic trouble code meaning: ECU Power Source Circuit Malfunction. Common causes: open or short circuit in wiring harness, faulty relay or fuse in the ecu power supply circuit. Estimated repair cost: $56–333.

Severity
🔴 High
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$56–333 (est.)

Symptoms

  • Engine won't start
  • Engine failures
  • Check Engine Light Is On
  • Lost connection with diagnostic equipment
  • Malfunctions of electronic systems

Causes

  • Open or short circuit in wiring harness
  • Faulty relay or fuse in the ECU power supply circuit
  • Contact corrosion
  • Damage to wire insulation
  • Internal ECU fault

How to Fix

  1. Check and replace blown fuses
  2. Check the condition of the power circuit relay
  3. Inspect the wiring harness for damage
  4. Clean contacts from corrosion
  5. Check the supply voltage at the ECU connector
  6. If necessary, replace the ECU

Related codes

B2621P0562P0563

FAQ

What does the B2620 code mean?

B2620 is an OBD-II diagnostic trouble code that indicates: ECU Power Source Circuit Malfunction

What causes a B2620 error code?

The most common causes of B2620 include: Open or short circuit in wiring harness; Faulty relay or fuse in the ECU power supply circuit; Contact corrosion; Damage to wire insulation.

How do I fix a B2620 diagnostic trouble code?

To fix B2620: Check and replace blown fuses. Check the condition of the power circuit relay. Inspect the wiring harness for damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B2620?

Limited driving only, diagnose soon

How much does it cost to fix B2620?

The estimated repair cost for B2620 is $56–333. Actual cost depends on your vehicle, location, and labor rates.

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