AutoCodes – Cadillac – B2735 Cadillac

B2735 Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 645

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC B2735 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

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

Need Help with the Code?

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

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 Cadillac Code

What does the OBDII code B2735 mean for a Cadillac?

B2735 indicates that the PASS-Key Programming Mode is active, which usually relates to issues with the vehicle's anti-theft system.

What symptoms might I experience if my Cadillac has the B2735 code?

Common symptoms include the vehicle not starting, the security light staying illuminated, or the engine cranking but failing to start.

What could cause the B2735 code to trigger?

Possible causes include a faulty key, issues with the ignition switch, wiring problems in the anti-theft system, or a malfunctioning Body Control Module (BCM).

How can I troubleshoot the B2735 code in my Cadillac?

Start by checking the key for damage or wear, inspect the ignition switch and wiring, and ensure the BCM is functioning correctly. Look for any additional DTCs that might provide more context.

Can I clear the B2735 code, and will it solve the problem?

Clearing the code may temporarily turn off the warning light, but if the underlying issue isn't resolved, the code will likely return.

Is it safe to drive my Cadillac with the B2735 code?

It's not recommended to drive the vehicle if it won't start or if the anti-theft system is engaged, as this can lead to being stranded or further damage.

Should I replace the key if I have the B2735 code?

If the key appears damaged or worn, replacing it may be a good first step, especially if you have a spare key to test.

What repairs might be necessary for a B2735 code?

Repairs could include reprogramming the key, replacing a faulty ignition switch, fixing wiring issues, or replacing the BCM.

Can I perform the repairs for the B2735 code myself?

Some basic troubleshooting can be done at home; however, programming keys and working on the anti-theft system often requires specialized tools and knowledge, so consulting a professional may be necessary.