AutoCodes – Generic – B2735

B2735 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 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 1,991

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

What does this mean?

What are the Possible Causes of the DTC B2735?

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?

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 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.

Need more information about the B2735 code?

Need more information on how to fix the B2735 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B2735 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B2735 Buick — PASS-Key Programming Mode Active
B2735 Cadillac — PASS-Key Programming Mode Active
B2735 Chevrolet — PASS-Key Programming Mode Active
B2735 GMC — PASS-Key Programming Mode Active

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 vehicleâ€™s PASS-Key system enters programming mode, which can happen during key reprogramming or if thereâ€™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 isnâ€™t functioning properly, leaving you stranded.

7. What tools are needed to troubleshoot code B2735?

Youâ€™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.