B1335 — Door Ajar RR Circuit Failure

What is the most common cause of B1335?

The most common causes are: corroded or loose connectors, damaged wiring in door jambs or wet areas, body control module (BCM) fault.

How much does it cost to fix B1335?

BCM repair or replacement — $300–$900; Replace the switch or actuator — $120–$450; Repair wiring or connectors — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

Is it safe to drive with B1335?

Usually safe to drive — body codes rarely affect drivability. Exceptions: exterior lighting and wipers in bad weather, and central locking faults that can leave the car unsecured.

What does OBD2 code B1335 mean?

B1335 — Door Ajar RR Circuit Failure. A fault in the body electrical system. The car is usually drivable while you plan the repair. Typical causes: corroded or loose connectors, damaged wiring in door jambs or wet areas, body control module (BCM) fault.

Will B1335 clear itself?

Sometimes B1335 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

When your vehicle's onboard computer detects a problem with the right rear door ajar circuit, it logs trouble code B1335. This code falls squarely in the body electrical category, meaning the issue lives in the network of switches, sensors and control modules that manage doors, locks, windows and related accessories. The PCM or body control module constantly monitors the electrical state of these circuits. When sensor readings fall outside factory specifications, the module logs B1335 and records a freeze frame snapshot.

The module does not trigger B1335 on a single bad reading. Instead, it typically requires the anomaly to persist across multiple drive cycles before confirming a genuine fault. This freeze frame captures critical engine data at the exact moment the failure occurred — engine RPM, calculated load, coolant temperature and vehicle speed. Technicians use that snapshot to recreate the failure conditions, which dramatically speeds up diagnosis. Without it, you could spend hours chasing a problem that only manifests under specific temperature or load conditions.

Symptoms

• The right rear door ajar indicator stays illuminated on the dashboard or refuses to light when the door is open
• Interior dome lights may behave erratically or fail to activate when the rear door opens
• The power lock system behaves unpredictably for the right rear door only
• Window operation for that specific door works intermittently or stops completely
• A check engine or body system warning light appears on the instrument cluster
• The fuel door may fail to release in some vehicle configurations
• Engine performance and drivability remain unaffected in most cases

Causes

• A failed door ajar switch or sensor in the right rear door latch mechanism
• Corrosion, moisture intrusion or looseness at the door connector harness
• Faulty body control module unable to process switch signals correctly
• Broken or chafed wiring at high-flex areas like door jambs and hinges
• Blown fuse or failed relay feeding the door ajar circuit
• Wiring damage in areas prone to water exposure, such as wheel wells or under door seals

How to Diagnose

1. Connect an OBD2 scanner and verify that B1335 is present. Save the associated freeze frame data before clearing anything — this record tells you exactly what conditions triggered the code.
2. Check for any other stored body-related trouble codes. Codes that appear alongside B1335 often point to the root cause rather than the symptom.
3. Perform a thorough visual inspection of the right rear door harness. Pull back weather stripping and examine connectors for green corrosion, bent pins or moisture residue.
4. Monitor the door ajar switch status in live data while physically opening and closing the right rear door. The PID should toggle between open and closed states cleanly.
5. Flex the wiring at door hinges and check points where wires pass through body passages. Insulation cracks and broken strands often hide under tape and loom.
6. Clear B1335, complete a full drive cycle that replicates the freeze frame conditions, then rescan to confirm the code does not return.

Repair Options

If diagnostics point to a failed component, here is what you can expect to pay:

• Body control module repair or replacement: $300–$900
• Door ajar switch or actuator replacement: $120–$450
• Wiring harness repair or connector replacement: $80–$250

Total Cost

The final bill depends entirely on which part actually failed. Parts and labor at independent shop rates typically land between $80 and $900 depending on the scenario. Always confirm the exact fault through live data and visual inspection before purchasing a body control module — it is the most expensive possible cause, and the least likely one in most cases.

Can You Drive with B1335?

B1335 carries a short severity rating. In most vehicles, the right rear door ajar fault will not impair engine operation or transmission function. You can continue driving, but be aware that exterior lighting coordination, interior illumination and power lock behavior may be compromised. If your vehicle configuration uses the right rear door signal for the fuel filler release or alarm system, address the issue sooner rather than later.

Related OBD2 codes

• B1300: Power Door Lock Circuit Failure
• B1301: Power Door Lock Circuit Open
• B1302: Accessory Delay Relay Coil Circuit Failure
• B1303: Accessory Delay Relay Coil Circuit Open
• B1304: Accessory Delay Relay Coil Circuit Short To Battery
• B1305: Accessory Delay Relay Coil Circuit Short To Ground