AutoCodes – Buick – B2735 Buick

B2735 Buick Code - PASS-Key Programming Mode Active

Quick Answer

The Body Control Module (BCM) supplies a 5 volt signal and a ground circuit for the PASS-KeyÂ® system. Common causes include Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted, Body Control Module (BCM) circuit poor electrical connection. 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 Buick indicates PASS-Key Programming Mode Active.
Common causes: Common causes include Faulty Body Control Module (BCM), Body Control Module (BCM) harness is open or shorted, Body Control Module (BCM) circuit poor electrical connection.
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.

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Code Popularity 757

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 26, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2735 Buick Description

The Body Control Module (BCM) supplies a 5 volt signal and a ground circuit for the PASS-KeyÂ® system. This allows the BCM to detect PASS-KeyÂ® resistance values. Inserting the PASS-KeyÂ® (with resistor pellet) in the ignition lock cylinder completes the PASS-KeyÂ® circuit. Contacts in the ignition lock cylinder mate with the pellet contacts. The BCM compares the resistance value of the key pellet to the valid resistance programmed into the BCM. If the proper resistance value is read, the BCM allows the following functions to occur: The theft deterrent relay to energize, The steering column to unlock and The BCM sends a message through the serial data line to the Powertrain Control Module (PCM) to enable fuel delivery. When a BCM is replaced, the BCM must be programmed to accept the resistance value of the existing vehicle keys in order to allow PASS-KeyÂ® operation. When the BCM is replaced, the service replacement BCM is programmed to accept the first PASS-KeyÂ® resistance value detected. If the BCM is unable to detect a valid PASS-KeyÂ® resistance value, the BCM will never end the programming sequence and DTC B2735 will set.

OBDII Code B2735 Buick - PASS-Key Programming Mode Active - AutoCodes.com — B2735 Buick Code - PASS-Key Programming Mode Active

What does this mean?

What are the Possible Causes of the DTC B2735 Buick?

Faulty Body Control Module (BCM)
Body Control Module (BCM) harness is open or shorted
Body Control Module (BCM) circuit poor electrical connection

How to Fix the DTC B2735 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2735 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 Buick Code

1. What does the OBDII code B2735 for Buick mean?

The code B2735 on a Buick indicates that the PASS-Key programming mode is active.

2. What are the common symptoms of the PASS-Key Programming Mode Active code?

Common symptoms may include issues with starting the vehicle, the security light staying on, or the engine stalling unexpectedly.

3. What causes the PASS-Key Programming Mode Active code to trigger in a Buick?

This code is often triggered by a problem with the vehicle's anti-theft system or the key not being recognized by the system.

4. How can I diagnose the PASS-Key Programming Mode Active code on my Buick?

Diagnosing this code usually involves checking the key, the ignition system, and the anti-theft system for any malfunctions or faults.

5. Can I fix the PASS-Key Programming Mode Active code on my Buick by myself?

While some simple issues like a faulty key or a weak battery can be addressed by the owner, more complex problems may require professional diagnosis and repair.

6. Are there any DIY tips for resolving the PASS-Key Programming Mode Active code?

DIY tips may include checking the key fob battery, ensuring the key is properly programmed, and checking for any visible damage to the key or the ignition system.

7. Will driving my Buick with the PASS-Key Programming Mode Active code cause any further damage?

Continuing to drive with this code may lead to further issues with the vehicle's security system or potential starting problems, so it's best to address the code promptly.

8. How much does it typically cost to repair the PASS-Key Programming Mode Active code on a Buick?

The cost of repair can vary depending on the underlying cause of the issue, so it's recommended to get a professional diagnosis for an accurate estimate.

9. Can resetting the system resolve the PASS-Key Programming Mode Active code on my Buick?

In some cases, performing a system reset may clear the code, but it's important to address the root cause of the issue to prevent it from reoccurring.

10. Is the PASS-Key Programming Mode Active code a common issue in Buick vehicles?

While it's not one of the most common OBDII codes, some Buick models may experience this code due to issues with the anti-theft system or key recognition.