B2602 — Missing Latch Signal During Power Sliding Door Unlatch #

Please note: The wording for this code may vary between vehicle manufacturers.

• “B2602: Sliding Door Latch Signal Not Detected” (Chrysler, Dodge, Jeep)
• “B2602: PSD Latch Signal Missing” (Toyota)
• “B2602: Power Sliding Door Unlatch Signal Failure” (Honda)

Summary of DTC B2602 #

B2602 is a Body Control Module (BCM)-related Diagnostic Trouble Code (DTC) indicating that the expected latch signal was not detected during an attempt to unlatch the power sliding door. When you activate your vehicle’s power sliding door, the system expects a confirmation (the “latch signal”) to verify the mechanical latch has disengaged. When this signal is missing or not received in time, the system logs B2602. This code typically points to a communication or component fault in the sliding door’s unlatching mechanism. It can be triggered by electrical issues, sensor failures, or mechanical binding within the latch assembly.

Common Symptoms for code B2602 #

When B2602 appears, you’ll often notice clear issues with your vehicle’s sliding door operation. The system may attempt to open, but the door won’t fully unlatch or move as expected. Sometimes, the door may operate intermittently or become stuck in a partially open or closed position. In rare cases, warning lights or chimes may alert you to a door malfunction.

• Power sliding door does not open or unlatch when commanded
• Sliding door stuck closed, partially open, or not responding to remote/fob
• Intermittent operation of the power sliding door
• Door ajar or warning indicator illuminated on the dashboard
• Unusual clicking or grinding sounds from the door area during operation

Likely Causes of B2602 (in order of frequency) #

B2602 is most often caused by electrical or mechanical problems with the sliding door’s latch or its associated wiring. Sometimes, control modules or misalignments contribute to the issue. Here are the most common sources:

1. Faulty sliding door latch assembly (mechanical or internal switch failure)
2. Damaged or corroded latch signal wiring/connectors
3. Defective sliding door latch position sensor
4. Misadjusted or misaligned door/latch mechanism
5. Body Control Module (BCM) or Door Control Module malfunction
6. Foreign objects or debris obstructing the latch movement

Step-by-Step Diagnostic for B2602 #

Diagnosing B2602 requires a systematic approach, ensuring no step is skipped. Here’s how an experienced technician would tackle the issue:

• 1. Confirm the code with a scan tool and note any related codes (especially door or body system).
• 2. Visually inspect the sliding door latch and surrounding area for physical damage or foreign objects.
• 3. Check the wiring and connectors between the latch, door control module, and BCM for corrosion, pinched wires, or loose terminals.
• 4. Test the latch assembly: Operate the latch manually and use a multimeter to verify the latch switch is providing the correct signal.
• 5. Examine door alignment and latch engagement (doors slightly out of alignment can cause signal loss).
• 6. If everything checks out, test or substitute the door control module and/or BCM as per OEM procedures.
• 7. Clear the code, cycle the door several times, and see if the fault returns.

Possible Repairs for B2602 #

B2602 repairs depend on the root cause. Address the most likely causes first and always follow OEM recommended procedures. Here are common repairs linked to this code:

• Replace or repair the sliding door latch assembly
• Clean, repair, or replace damaged latch signal wiring/connectors
• Recalibrate or realign the sliding door and latch components
• Remove any obstructions or debris from the latch area
• Replace a faulty door control module or body control module (rare, after confirming with OEM diagnostics)

Is it safe to drive with code B2602? #

Driving is generally safe but with limitations: The B2602 code typically affects only the power sliding door operation. The door may remain closed and secure, but it may not open or could become stuck. If the door is stuck open or cannot be secured, do not drive the vehicle for safety reasons. For doors that remain closed and latched, driving is possible—but be aware of the inconvenience and potential security risk. Always ensure passengers, especially children, are kept away from malfunctioning doors.

Vehicles Most Commonly Affected by B2602 #

This code is most frequently seen on minivans and SUVs equipped with power sliding doors, especially those produced in the 2000s and 2010s. Here are some models where B2602 is more prevalent:

• Chrysler Town & Country
• Dodge Grand Caravan
• Honda Odyssey
• Toyota Sienna
• Kia Sedona
• Nissan Quest

Common Mistakes & Best Practices for B2602 #

When addressing B2602, avoid these frequent pitfalls and use these best practices to ensure a successful repair:

• Assuming the latch is faulty without checking wiring and connectors first
• Overlooking door alignment or physical obstructions
• Replacing expensive modules before confirming latch and wiring integrity
• Forgetting to clear the code and retest after repairs
• Best Practice: Always follow a logical diagnostic path, starting with the simplest and most likely causes

Quick FAQ for B2602 #

Q: Will B2602 cause my sliding door to be stuck open?
A: Sometimes, yes. If the latch cannot signal properly, the door may not fully close or open. Always inspect and attempt to secure the door before driving.

Q: Can I fix B2602 myself, or do I need a professional?
A: Basic checks like inspecting for debris or obvious wiring damage can be done at home. However, proper diagnostics and repairs—especially involving sensors and control modules—are best left to a qualified technician with access to OEM information.