OBD Guide
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B1303

Accessory Delay Relay Coil Circuit Open

B1303 is an OBD-II diagnostic trouble code meaning: Accessory Delay Relay Coil Circuit Open. Common causes: break in the wiring harness, faulty accessory delay relay. Estimated repair cost: $11–56.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$11–56 (est.)

Symptoms

  • Immediate disconnection of accessories after turning off the ignition
  • Shutdown delay functions do not work (for example, radio, interior lighting)
  • Possible problems with the radio settings memory

Causes

  • Break in the wiring harness
  • Faulty accessory delay relay
  • Problems with the control unit
  • Corrosion or poor contact in connectors

How to Fix

  1. Check the integrity of the wiring harness
  2. Check accessory delay relay
  3. Inspect connectors for corrosion or damage
  4. If necessary, replace the relay or repair the wiring harness

Related codes

B1301B1302B1304

FAQ

What does the B1303 code mean?

B1303 is an OBD-II diagnostic trouble code that indicates: Accessory Delay Relay Coil Circuit Open

What causes a B1303 error code?

The most common causes of B1303 include: Break in the wiring harness; Faulty accessory delay relay; Problems with the control unit; Corrosion or poor contact in connectors.

How do I fix a B1303 diagnostic trouble code?

To fix B1303: Check the integrity of the wiring harness. Check accessory delay relay. Inspect connectors for corrosion or damage. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1303?

Yes, but get it checked soon

How much does it cost to fix B1303?

The estimated repair cost for B1303 is $11–56. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat