Our certified mechanics come to you · Get a fair and transparent estimate upfront
B1392 is a diagnostic trouble code (DTC) for "Power Door Memory Lock Relay Circuit Failure". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The B1392 trouble code detects a malfunction with the power door memory lock relay circuit.
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.
Causes of the B1392 code include:
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.
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.
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.
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.
Fixes for the B1392 trouble code include:
The B1392 trouble code only applies to vehicle that have power door memory lock systems.
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.