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Engine-Codes – Generic – B2735

B2735 Code - PASS-Key Programming Mode Active

Quick Answer

The B2735 code indicates that the vehicle's PASS-Key programming mode is active. Common causes include Faulty key or key fob, Malfunctioning transponder chip, Issues with the receiver in the vehicle. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B2735 indicates PASS-Key Programming Mode Active.
Common causes
Common causes include Faulty key or key fob, Malfunctioning transponder chip, Issues with the receiver in the vehicle.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code B2735 Description

The B2735 code indicates that the vehicle's PASS-Key programming mode is active. PASS-Key is a security feature in many vehicles that helps prevent unauthorized use of the vehicle by requiring a specific key or key fob to start the engine. When this code is triggered, it means that there is an issue with the PASS-Key system, potentially leading to difficulties in starting the vehicle or other security-related problems.

OBDII Code B2735 - PASS-Key Programming Mode Active
B2735 Code - PASS-Key Programming Mode Active

Common Causes of B2735

  1. Faulty key or key fob
  2. Malfunctioning transponder chip
  3. Issues with the receiver in the vehicle
  4. Problems with the immobilizer system
  5. Wiring or connection issues in the security system

Symptoms of B2735

  1. Vehicle not starting
  2. Vehicle starts but immediately shuts off
  3. Security light flashing on the dashboard
  4. Inability to start the vehicle even with the correct key
  5. Alarm system activating unexpectedly

How to Fix B2735

  1. Check the key or key fob for any visible damage or issues.
  2. Inspect the transponder chip for malfunctions and replace if necessary.
  3. Test the receiver in the vehicle to ensure it is functioning correctly.
  4. Check the immobilizer system for faults and repair or replace components as needed.
  5. Inspect wiring and connections in the security system for any damage or loose connections.

Cost to Fix B2735

The cost of repairing the B2735 code can vary depending on the specific issue causing the problem. In general, repairs related to the PASS-Key system can range from $100 to $500, including parts and labor. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary significantly. It's recommended to check with local shops to get a more accurate estimate based on your vehicle make and model.

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Code B2735 Information for Specific Makes

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B2735 Code

1. What does OBDII code B2735 mean?

B2735 indicates that the PASS-Key system is in programming mode, which is typically used to program or reprogram a new key or security module.

2. What are the common symptoms of code B2735?

Common symptoms include the engine not starting, the security light staying illuminated, or other key-related issues.

3. What causes the B2735 code to appear?

The code is triggered when the vehicle’s PASS-Key system enters programming mode, which can happen during key reprogramming or if there’s an issue with the ignition switch or BCM (Body Control Module).

4. Can a faulty ignition switch cause code B2735?

Yes, a faulty ignition switch can cause the system to malfunction and trigger the B2735 code.

5. How do I clear the B2735 code?

The code will typically clear itself after the key programming process is completed. If it persists, diagnose and repair any related issues.

6. Can driving with code B2735 cause any harm?

No, but the vehicle may not start if the PASS-Key system isn’t functioning properly, leaving you stranded.

7. What tools are needed to troubleshoot code B2735?

You’ll need a scan tool capable of reading security system data, and possibly a key programmer if reprogramming is required.

8. Is key reprogramming always required to fix B2735?

Not always. Sometimes the issue lies in a faulty component like the ignition switch or BCM rather than the key itself.

9. How much does it cost to repair a B2735 code?

Costs vary depending on whether reprogramming is needed or a part like the ignition switch or BCM requires replacement, typically ranging from $100 to $500.

10. Can I fix code B2735 myself?

If you have the proper tools and knowledge, you can attempt to reprogram the key or check for related component issues, but professional assistance is recommended for complex repairs.

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