Symptoms
- Door ajar or open-door warning light stays lit on the dashboard
- All doors appear and feel fully closed
- May be intermittent, coming and going while driving
- Interior lights may stay on longer than normal
Likely causes
- CommonFaulty or dirty door jamb switch (sensor)The switch that detects an open door can stick, corrode, or wear out and send a false signal.
- CommonDoor not latching fully even though it feels closedA door that isn't seated all the way triggers the sensor even if it looks shut.
- PossibleWiring issue at the door hinge or jambWires that flex every time the door opens can fray over years of use.
- PossibleTrunk or hood sensor triggering a similar warningSome systems group all closures together, so check the trunk and hood too.
What to do
- Open and firmly re-close each door one at a time, listening for a solid double-click or full latch sound.
- Check the trunk and hood as well, since some ajar warnings cover all closures, not just doors.
- Inspect each door jamb switch (usually a small button or pin on the door frame) for dirt, rust, or sticking.
- Clean the switch area and work it by hand a few times to see if that resolves a sticky one.
- Check for visible wiring damage near the door hinges if the switch itself looks fine.
- Have a shop test and replace the specific faulty door switch or wiring if cleaning doesn't help.
Tools and parts
- Flashlight
Door jamb switchSearch: “door jamb switch for [year make model]”
When to call a pro
See a shop if you can't identify which door or sensor is at fault, since tracing an intermittent wiring issue can take proper test equipment.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.