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B1873 is a diagnostic trouble code (DTC) for "Turn Signal / Hazard Power Feed Circuit Short to Ground". 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 B1873 trouble code signals a malfunction from the turn signal and hazard light power feed circuit.
The B1873 code is a generic OBD-II trouble code that detects a turn signal and hazard light power feed circuit error, which controls the front and rear turn signal lights, which are also the hazard warning lights. If the body control module or powertrain control module (PCM) detects an abnormal voltage reading from the turn signal and hazard power feed circuit, then the B1873 code may be triggered.
Some causes of the B1873 trouble code are:
When the B1873 code is stored, the turn signals and hazard warning lights likely won’t work.
The B1873 code should be diagnosed with the help of a standard OBD-II trouble code scanner. A trained mechanic will use the scanner to view the freeze frame data and gather information about the code, as well as to check for the presence of additional trouble codes. If there are multiple codes present, then they will need to be diagnosed in the order that they appear in. The mechanic will then need to reset the trouble codes, restart the vehicle, and check for the presence of the B1873 code. If the code is no longer present, it was likely the result of an intermittent issue, or an erroneous trigger.
If the code remains detected, the mechanic will begin by testing the turn signal lights. If only some of them are failing to operate, then a blown bulb is the likely culprit. Next, the technician will visually inspect all of the electrical components in the turn signal system, and replace any damaged fuses, wires, and connectors. The voltage in the circuit will then need to be checked. If the problem persists, then the turn signal switch and flasher relay will require inspection.
After the mechanic replaces or repairs any components, the trouble codes should be reset, the vehicle restarted, and the B1873 code once again checked for. This helps the technician know as soon as the issue is resolved.
The most frequently made errors when diagnosing this code come from a failure to abide by the OBD-II diagnosis protocol. The protocol should be stuck to at all times, step by step, as this helps increase the chance of a thorough inspection, and decrease the chance of improper repairs.
Often turn signal switches and flasher relays are unnecessarily replaced because the electrical components in the system were never checked.
A vehicle with a detected B1873 trouble code will likely have inoperable turn signals and hazard warning lights. Both of these are important safety features in any vehicle, and failure to have properly working turn signals can result in a hefty fix it ticket. For safety and practicality purposes, any vehicle experiencing a B1873 trouble code should be inspected as soon as possible.
Repairs for the B1873 code include:
This code is a manufacturer specific code, which means that the definition varies by automaker. The B1873 code notes a turn signal and hazard power feed circuit issue in some cars, but represents an entirely different diagnostic error in other vehicles. It’s important for the mechanic to always be aware of the vehicle being worked on when diagnosing and inspecting the B1873 code.
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