OBD Guide
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B10E7

Ignition On Relay

B10E7 is an OBD-II diagnostic trouble code meaning: Ignition On Relay. Common causes: faulty ignition relay, open or short circuit in the relay circuit. Estimated repair cost: $22–56.

Severity
⚠️ Medium
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$22–56 (est.)

Symptoms

  • Engine won't start
  • Electrical problems
  • Unstable operation of systems when the ignition is turned on

Causes

  • Faulty ignition relay
  • Open or short circuit in the relay circuit
  • Problems with the control unit
  • Oxidation of relay contacts

How to Fix

  1. Check the condition of the ignition relay
  2. Check the integrity of the relay power circuit
  3. Check the control signal from the control unit
  4. Replace relay if necessary
  5. Clean relay contacts and connector

Related codes

B10E8B10E9

FAQ

What does the B10E7 code mean?

B10E7 is an OBD-II diagnostic trouble code that indicates: Ignition On Relay

What causes a B10E7 error code?

The most common causes of B10E7 include: Faulty ignition relay; Open or short circuit in the relay circuit; Problems with the control unit; Oxidation of relay contacts.

How do I fix a B10E7 diagnostic trouble code?

To fix B10E7: Check the condition of the ignition relay. Check the integrity of the relay power circuit. Check the control signal from the control unit. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B10E7?

Yes, but get it checked soon

How much does it cost to fix B10E7?

The estimated repair cost for B10E7 is $22–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat