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B1392 OBD-II Trouble Code: Power Door Memory Lock Relay Circuit Failure

diagnostic check engine light

B1392 code definition

The B1392 trouble code detects a malfunction with the power door memory lock relay circuit.

What the B1392 code means

The B1392 code is a generic OBD-II trouble code that notes a circuit error with the power door memory lock relay. The power door memory lock system allows drivers to select some custom power door lock and unlock features, so that certain doors will automatically lock or unlock when the car reaches a certain speed, when the vehicle is put in the Park position, or when the engine is turned off. When the body control module or the powertrain control module (PCM) receives an abnormal voltage reading from the power door memory lock relay circuit, the B1392 trouble code will be stored.

What causes the B1392 code?

Causes of the B1392 code include:

What are the symptoms of the B1392 code?

When the B1392 trouble code is detected, the power door memory lock system likely will not work. This means that any preset automatic lock and unlock settings will not function.

How does a mechanic diagnose the B1392 code?

The B1392 code will be diagnosed with the help of a standard OBD-II trouble code scanner. A trained mechanic will use the freeze frame data from the scanner to view the B1392 code, and to see if any other trouble codes have been detected. If there are multiple codes present, the technician will diagnose them in the order in which they appear on the scanner. The trouble codes will then be reset, and the vehicle restarted, so the mechanic can see if the B1392 code remains detected. If it does not, then it was probably triggered inaccurately, or the result of an intermittent error.

If the code remains present, the mechanic will visually inspect all of the wires in the power door lock system, and repair or replace any that are damaged. All connectors and fuses should also be checked during this inspection. If the wires are in good shape, then the circuit should be tested, and the power door memory lock relay inspected.

After any repairs or replacements are made, the mechanic should reset the trouble codes, restart the vehicle, and once again check to see if the B1392 code is detected. By doing this, the technician will know as soon as the issue has been resolved.

Common mistakes when diagnosing the B1392 code

The most frequently made mistake when diagnosing the B1392 code comes from failing to properly follow the OBD-II trouble code diagnosis protocol. It is vital that mechanics abide by the protocol at all times, as it helps ensure that diagnoses are efficient and thorough.

It is fairly common for fully functional power door memory lock circuits to be erroneously replaced because a damaged wire was overlooked.

How serious is the B1392 code?

The B1392 trouble code won’t keep a car from being drivable, though it will likely render the power door memory lock system inoperable. As with all trouble codes, when the B1392 code is detected, an inspection should be scheduled.

What repairs can fix the B1392 code?

Fixes for the B1392 trouble code include:

  • Wires repair or replacement
  • Connectors or fuses repair or replacement
  • Power door memory lock circuit replacement
  • Power door memory lock relay replacement

Additional comments for consideration regarding the B1392 code

The B1392 trouble code only applies to vehicle that have power door memory lock systems.

Need help with a B1392 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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