B1335: Right Rear Door Ajar Circuit
The B1335 code indicates that the Body Control Module (BCM/GEM) has detected a fault in the right rear door ajar switch circuit. This means the voltage signal from the switch is out of range—either an open circuit, short to ground, or short to battery voltage—preventing the module from determining the actual door status.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty or stuck right rear door ajar switch
- Wiring shorted to ground, shorted to battery, or open circuit in the switch circuit
- Damaged, corroded, or loose connector at the switch or BCM/GEM
- Internal failure of the Body Control Module (BCM/GEM)
- Mechanical misalignment of the door or latch preventing switch actuation
3. Symptoms You Will Notice
- Door ajar warning light stays on or flashes
- Interior lights stay on or behave erratically
- Remote keyless entry or alarm system malfunctions
4. Step-by-Step Diagnosis
Check for technical service bulletins (TSBs) related to the B1335 code
Visually inspect the right rear door ajar switch and its wiring for damage or corrosion
Test the switch operation using a multimeter to verify continuity when the door is opened and closed
Check for shorts or opens in the wiring between the switch and the BCM/GEM
If all else is normal, test the BCM/GEM for proper operation or replace it
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the door ajar warning and interior lights may not function correctly. It is recommended to diagnose and repair the issue soon to avoid battery drain or security concerns.
How much does it cost to fix?▼
The cost typically ranges from $100 to $300, depending on whether the switch, wiring, or BCM needs replacement. Diagnostic fees are usually around $75-$150.