AutoCodes – GMC – B2735 GMC

B2735 GMC 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 GMC 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 603

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

What does this mean?

What are the Possible Causes of the DTC B2735 GMC?

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 GMC?

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 GMC 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 GMC code?

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

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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 GMC Code

1. What are the common symptoms of OBDII code B2735 GMC PASS-Key Programming Mode Active?

The common symptoms include the vehicle not starting, the security light staying on or flashing, and issues with the ignition system.

2. What does it mean when my GMC vehicle displays the OBDII code B2735 PASS-Key Programming Mode Active?

This code indicates that the vehicle's security system is in programming mode, which can prevent the vehicle from starting.

3. What are the possible causes of OBDII code B2735 GMC PASS-Key Programming Mode Active?

Possible causes include a malfunctioning ignition key, a faulty ignition lock cylinder, or issues with the vehicle's security system.

4. How can I repair OBDII code B2735 GMC PASS-Key Programming Mode Active?

To repair this code, you may need to reprogram the vehicle's key using a specific procedure outlined in the vehicle's manual or seek assistance from a professional mechanic.

5. Can I reset OBDII code B2735 GMC PASS-Key Programming Mode Active on my own?

Resetting this code may require specialized equipment or knowledge, so it is recommended to consult a professional mechanic for assistance.

6. Is it safe to drive my GMC vehicle with OBDII code B2735 PASS-Key Programming Mode Active?

It is not recommended to drive the vehicle with this code active as it may lead to starting issues or potential security system malfunctions.

7. How can I prevent OBDII code B2735 GMC PASS-Key Programming Mode Active from occurring?

To prevent this code, ensure your ignition key is in good condition, avoid forcing the key into the ignition, and regularly maintain your vehicle's security system.

8. Can a low battery trigger OBDII code B2735 GMC PASS-Key Programming Mode Active?

A low battery can sometimes trigger this code due to voltage fluctuations affecting the vehicle's security system. Ensure your vehicle's battery is in good condition.

9. How long does it take to resolve OBDII code B2735 GMC PASS-Key Programming Mode Active?

The time to resolve this code varies depending on the cause of the issue and the repair method used. It may take a professional mechanic a few hours to diagnose and fix the problem.

10. Is OBDII code B2735 GMC PASS-Key Programming Mode Active a common issue in GMC vehicles?

While not extremely common, issues related to PASS-Key programming mode can occur in some GMC vehicles, particularly in older models or those with high mileage.