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B1330 OBD-II Trouble Code: Passenger Door Ajar Circuit Short to Ground

diagnostic check engine light

B1330 code definition

The B1330 trouble code signals an error with the passenger door ajar circuit.

What the B1330 code means

The B1330 code is a generic OBD-II trouble code that detects an issue with the passenger door ajar circuit. When the passenger door is not properly latched, then the door ajar Warning Light will illuminate. If it is detected that the signal from the passenger door circuit is abnormal, then then the B1330 trouble code will likely be stored.

What causes the B1330 code?

A few different things can trigger the B1330 trouble code:

What are the symptoms of the B1330 code?

If the B1330 trouble code is present, then the door ajar Warning Light on the vehicle’s instrument panel will likely stay illuminated constantly, even if the passenger door is fully latched. It is common for this warning light to stay lit even when the vehicle is turned off, which often results in the cabin lights remaining lit at all times as well. This will drain the battery, meaning that the vehicle may not start if it is left turned off for an extended period of time.

How does a mechanic diagnose the B1330 code?

The B1330 code should be diagnosed using a standard OBD-II trouble code scanner. A trained technician will use the scanner to view the freeze frame data and assess the B1330 code. The mechanic will also check to see if there are any other trouble codes present. If there are multiple codes detected, then they will need to be addressed in the order in which they appear on the scanner. The trouble codes should then be reset, and the vehicle restarted, so the mechanic can see if the code remains detected. If not, it likely represents an intermittent error, or was erroneously triggered.

If the B1330 code remains, then the mechanic should visually inspect the electrical components in the door ajar system, and replace any blown fuses, corroded connectors, or shorted wires. Next, the technician will check the circuit to ground voltage.

After inspecting the circuit, the mechanic should test the passenger door latch, and possibly lubricate it to make sure that it is latching completely. Finally, the passenger door ajar switch should be inspected. If the issue remains unresolved, then the door ajar Warning Light dimmer likely requires an adjustment.

After the mechanic completes any repairs or replacements, the trouble code should once again be checked for, or the door ajar Warning Light should be tested. By doing this, the mechanic will know as soon as the issue has been fixed.

Common mistakes when diagnosing the B1330 code

The most frequently made mistake when diagnosing this code comes from a failure to follow the OBD-II diagnosis protocol. Mechanics should always follow the protocol to ensure thorough and efficient inspections and repairs.

Properly working passenger door ajar switches are often condemned when the problem causing the B1330 code was a simple electrical malfunction.

How serious is the B1330 code?

It is quite common for the B1330 trouble code to keep a car from being drivable, because it may drain the battery and keep the car from being able to start. As is always the case with trouble codes, an inspection should be scheduled as soon as the code is detected.

What repairs can fix the B1330 code?

B1330 trouble code repairs are:

  • Replacement of the passenger door ajar switch
  • Door latch service or replacement
  • Replacement of electrical components, including circuitry
  • Adjustment of the door ajar Warning Light dimmer
  • Lubrication of the passenger door latch

Additional comments for consideration regarding the B1330 code

While the B1330 trouble code suggests a passenger door ajar circuit malfunction in lots of vehicles, the code has a different definition for some makes and models, and may represent an entirely different issue.

Need help with a B1330 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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