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B1336 OBD-II Trouble Code: Door Ajar Right Rear Circuit Open

B1336 code definition

The B1336 trouble code notes an error with the door ajar right rear circuit.

What the B1336 code means

The B1336 code is a standard OBD-II trouble code that detects a problem with the right (passenger side) rear door ajar circuit. The door ajar Warning Light will illuminate on the gauge cluster when the system detects that the right rear door is not completely latched. Sometimes the warning light will specify which door isn’t closed, but in most models it will simply note that a door is open. When the right rear door ajar circuit reading is not as it should be, then the B1336 trouble code will be stored.

What causes the B1336 code?

A few different things can cause the B1336 trouble code:

  • Faulty right rear door ajar switch
  • Defective door ajar circuit
  • Jammed or faulty right rear door latch
  • Faulty electrical components in the door ajar system
  • Incorrectly adjusted door ajar Warning Light dimmer

What are the symptoms of the B1336 code?

A vehicle with a detected B1336 trouble code will likely have a constantly illuminated door ajar Warning Light, even when all of the doors are closed. The warning light will likely stay lit when the vehicle is turned off. In many cars, the interior lights will stay lit as long as the door ajar Warning Light is illuminated, which means that the cabin lights will stay on even when the car is turned off. This can quickly drain the vehicle’s battery, and may result in the car being unable to turn on.

How does a mechanic diagnose the B1336 code?

The B1336 code should be diagnosed with the help of a standard OBD-II trouble code scanner. A trained technician will use the scanner to view the freeze frame data and assess the B1336 code, while also checking to see if there are any other trouble codes detected. If multiple codes are present, then the technician will inspect them in the order in which they appear. Next, the mechanic will reset the trouble codes, restart the vehicle, and look to see if the B1336 code is still detected. If not, then it most likely is the result of an intermittent error, or possibly an inaccurate detection.

If the B1336 trouble code is still present, then a visual inspection will be performed on the electrical components in the door ajar system. Any blown fuses, open circuits, corroded connectors, or shorted wires will need to be replaced before the inspection is continued. The technician will then inspect the right rear door latch to see if it is partially stuck. If it is, it can usually be fixed with lubrication. Next, the right rear door ajar switch will be thoroughly checked, and repaired or replaced if necessary. If none of these components are faulty, then the door ajar Warning Light dimmer is in need of an adjustment.

After the mechanic replaces any component, the trouble codes will again be reset, the vehicle restarted, and the B1336 code checked for. This helps the technician know as soon as the problem is resolved.

Common mistakes when diagnosing the B1336 code

The most frequently made mistake when diagnosing this code is the failure to abide by the OBD-II trouble code diagnosis protocol. It is imperative that mechanics always follow the protocol step by step, as this guarantees diagnoses that are accurate and efficient.

Right rear door ajar switches are frequently replaced unnecessarily because an electrical issue was overlooked.

How serious is the B1336 code?

The B1336 trouble code may keep a vehicle from starting, because the interior lights may stay lit long enough to entirely drain the battery. To keep this issue from occurring, it’s important to schedule an inspection as soon as the B1336 code is noted.

What repairs can fix the B1336 code?

Common repairs for the B1336 trouble code are:

  • Replacing of the right rear door ajar switch
  • Lubricating of the right rear door latch
  • Replacing electrical components
  • Adjusting the door ajar Warning Light dimmer

Additional comments for consideration regarding the B1336 code

A right rear door ajar switch that is defective may be repairable, though in most cases it will need to be replaced.

Need help with a B1336 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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