AutoCodes – GMC – B2253 GMC

B2253 GMC Code - Right Key Cylinder Switch Fault

Quick Answer

The driver or passenger door key switch signal circuits provide input to the Driver Door Module (DDM) or Passenger Door Module (PDM) when the driver or passenger door lock cylinder is rotated to the UNLOCK position. Common causes include Faulty Right Key Cylinder Switch, Right Key Cylinder Switch harness is open or shorted, Right Key Cylinder Switch 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: B2253 GMC indicates Right Key Cylinder Switch Fault.
Common causes: Common causes include Faulty Right Key Cylinder Switch, Right Key Cylinder Switch harness is open or shorted, Right Key Cylinder Switch 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 504

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 Oct 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2253 GMC Description

The driver or passenger door key switch signal circuits provide input to the Driver Door Module (DDM) or Passenger Door Module (PDM) when the driver or passenger door lock cylinder is rotated to the UNLOCK position. This input allows the door module to detect a door UNLOCK request. The door module provides power and ground to the door key switch. When the door lock cylinder is rotated to the UNLOCK position, a ground is supplied through the door key switch to the signal circuit, which is pulled low. When the DDM detects low voltage on the driver door key switch signal circuit, it sends a message on the serial data line to the PDM to UNLOCK the passenger door. When the PDM detects low voltage on the passenger door key switch signal circuit, it sends a message on the serial data line to the DDM to UNLOCK the driver door. The messages sent on the serial data line are also used by other systems to execute certain functions. The DDM and PDM monitor the signal circuits to determine how long the ground has been applied. If the DDM or PDM detects that the ground is applied for greater than 20 seconds, a Diagnostic Trouble Code (DTC) is set.

OBDII Code B2253 GMC - Right Key Cylinder Switch Fault - AutoCodes.com — B2253 GMC Code - Right Key Cylinder Switch Fault

What does this mean?

What are the Possible Causes of the DTC B2253 GMC?

Faulty Right Key Cylinder Switch
Right Key Cylinder Switch harness is open or shorted
Right Key Cylinder Switch circuit poor electrical connection
Faulty Passenger Door Module (PDM)

How to Fix the DTC B2253 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 B2253 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.

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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 B2253 GMC Code

1. What does the OBDII code B2253 mean for a GMC?

The B2253 code indicates a fault in the right key cylinder switch, which is part of the vehicleâ€™s anti-theft or ignition system.

2. What are the common symptoms of the B2253 code in a GMC?

Symptoms may include difficulty turning the key, the ignition not responding, anti-theft warnings on the dashboard, or the vehicle failing to start.

3. What causes the B2253 Right Key Cylinder Switch Fault code to appear?

Common causes include a faulty key cylinder switch, damaged wiring or connectors, or issues with the Body Control Module (BCM).

4. Can a worn-out key cause the B2253 code on a GMC?

Yes, a worn or damaged key can prevent proper communication with the key cylinder switch, potentially triggering the B2253 code.

5. How can I diagnose the B2253 code in my GMC vehicle?

Start by inspecting the key cylinder and associated wiring for damage. Use a scan tool to check related codes and test the switchâ€™s functionality.

6. Is it safe to drive with the B2253 code active?

Driving may be unsafe if the vehicle is unable to start reliably or if the anti-theft system activates unexpectedly.

7. How do I fix the B2253 code on a GMC?

Repairs may involve replacing the right key cylinder switch, repairing damaged wiring, or reprogramming the BCM if necessary.

8. Does the B2253 code always mean the key cylinder switch needs to be replaced?

Not always. It could also be caused by loose or damaged wiring, a faulty connector, or even a problem in the BCM.

9. Can extreme weather conditions cause the B2253 code to trigger?

Yes, extreme cold or heat can affect the key cylinder switch and cause temporary malfunctions, potentially triggering the code.

10. Do I need a professional to fix the B2253 code on my GMC?

While minor issues like wiring damage can be fixed by an experienced DIYer, diagnosing and replacing the key cylinder switch or reprogramming the BCM may require professional assistance.