OBD Code B1336: Door Ajar RR Circuit Open

Q: What does OBD code B1336 mean?

Door Ajar RR Circuit Open. The rear right door's position sensor circuit is broken or disconnected, so the vehicle can't tell if that door is open or closed. It's like a light switch with a cut wire—the signal never reaches the control module.

Q: What are the symptoms of fault code B1336?

Door ajar warning light stays on continuously, Interior dome light may not function properly with door open/close, Vehicle may not lock or unlock rear right door remotely

Q: How do I fix OBD fault code B1336?

Inspect and reseat the connector at the rear right door latch for corrosion or loose pins.. Check the wiring between the door and body frame for cuts, pinches, or damaged insulation.. Replace the faulty latch switch if continuity tests confirm internal switch failure.

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What This Actually Means

In plain language — no jargon

The rear right door's position sensor circuit is broken or disconnected, so the vehicle can't tell if that door is open or closed. It's like a light switch with a cut wire—the signal never reaches the control module.

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Symptoms You May Notice

3 known symptoms for this code

Door ajar warning light stays on continuously

Interior dome light may not function properly with door open/close

Vehicle may not lock or unlock rear right door remotely

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Embedded Systems Insight

What the ECU/ECM is actually computing

The body control module monitors the rear right door latch switch, which should toggle between open and closed circuit states. The ECU expects a valid voltage signal (typically 0V when closed, 12V when open) and flags a fault when the circuit remains open with no valid signal detected.

Voltage & Parameter Thresholds

Parameter	Normal Range	Fault Condition
Door latch signal voltage	0V (closed) or 12V (open)	No signal or intermittent connection detected
Circuit continuity	Complete circuit with resistance <10 ohms	Open circuit with infinite resistance

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Diagnostic & DIY Fix Guide

Check these in order — from cheapest to most complex

1

Door latch switch connector

Inspect and reseat the connector at the rear right door latch for corrosion or loose pins.

2

Door latch wiring harness

Check the wiring between the door and body frame for cuts, pinches, or damaged insulation.

3

Door latch switch assembly

Replace the faulty latch switch if continuity tests confirm internal switch failure.