OBD Guide
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B1311

Power Door Unlock Circuit Open

B1311 is an OBD-II diagnostic trouble code meaning: Power Door Unlock Circuit Open. Common causes: broken wires in the harness, oxidation of contacts in connectors. Estimated repair cost: $33–167.

Severity
✅ Low
Can you drive?
Yes, but get it checked soon
Approx. repair cost
$33–167 (est.)

Symptoms

  • Doors do not open with button or key fob
  • Periodic failures in the opening system
  • Relay clicks without triggering the mechanism

Causes

  • Broken wires in the harness
  • Oxidation of contacts in connectors
  • Opening solenoid malfunction
  • Problems with the control relay
  • Damage to the comfort module

How to Fix

  1. Check the integrity of the wiring harness to the door (inspect for kinks)
  2. Clean the contacts in the system connectors
  3. Check the operation of the opening solenoid
  4. Diagnose the condition of the control relay
  5. Replace damaged components if necessary

Related codes

B1310B1312B1320

FAQ

What does the B1311 code mean?

B1311 is an OBD-II diagnostic trouble code that indicates: Power Door Unlock Circuit Open

What causes a B1311 error code?

The most common causes of B1311 include: Broken wires in the harness; Oxidation of contacts in connectors; Opening solenoid malfunction; Problems with the control relay.

How do I fix a B1311 diagnostic trouble code?

To fix B1311: Check the integrity of the wiring harness to the door (inspect for kinks). Clean the contacts in the system connectors. Check the operation of the opening solenoid. For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with B1311?

Yes, but get it checked soon

How much does it cost to fix B1311?

The estimated repair cost for B1311 is $33–167. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat