OBD Guide
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B210B

Starter Control Relay ON

B210B is an OBD-II diagnostic trouble code meaning: Starter Control Relay ON. Common causes: faulty starter relay, damaged wiring harness. Estimated repair cost: $22–111.

Severity
⚠️ Medium
Can you drive?
Limited driving only, diagnose soon
Approx. repair cost
$22–111 (est.)

Symptoms

  • Problems starting the engine
  • The starter continues to operate after the engine starts
  • Relay clicks when trying to start

Causes

  • Faulty starter relay
  • Damaged wiring harness
  • Short circuit in control circuit
  • Engine control unit (ECU) malfunction

How to Fix

  1. Check the condition of the starter relay
  2. Inspect the wiring harness for damage
  3. Check relay control circuit for short circuit
  4. Replace starter relay or ECU if necessary

Related codes

B210AB210C

FAQ

What does the B210B code mean?

B210B is an OBD-II diagnostic trouble code that indicates: Starter Control Relay ON

What causes a B210B error code?

The most common causes of B210B include: Faulty starter relay; Damaged wiring harness; Short circuit in control circuit; Engine control unit (ECU) malfunction.

How do I fix a B210B diagnostic trouble code?

To fix B210B: Check the condition of the starter relay. Inspect the wiring harness for damage. Check relay control circuit for short circuit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B210B?

Limited driving only, diagnose soon

How much does it cost to fix B210B?

The estimated repair cost for B210B is $22–111. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat