AutoCodes – GMC – B2252 GMC

B2252 GMC Code - Left 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 Left Key Cylinder Switch, Left Key Cylinder Switch harness is open or shorted, Left 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: B2252 GMC indicates Left Key Cylinder Switch Fault.
Common causes: Common causes include Faulty Left Key Cylinder Switch, Left Key Cylinder Switch harness is open or shorted, Left 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 679

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 B2252 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 B2252 GMC - Left Key Cylinder Switch Fault - AutoCodes.com — B2252 GMC Code - Left Key Cylinder Switch Fault

What does this mean?

What are the Possible Causes of the DTC B2252 GMC?

Faulty Left Key Cylinder Switch
Left Key Cylinder Switch harness is open or shorted
Left Key Cylinder Switch circuit poor electrical connection
Faulty Driver Door Module (DDM)

How to Fix the DTC B2252 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 B2252 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 B2252 GMC Code

1. What are the common symptoms of OBDII code B2252 GMC (Left Key Cylinder Switch Fault)?

The common symptoms include issues with turning the ignition key, difficulty starting the vehicle, and potential warning lights on the dashboard.

2. What are the possible causes of the B2252 GMC code?

The B2252 code is typically caused by a faulty left key cylinder switch, damaged wiring related to the switch, or a defective ignition key.

3. How can I diagnose the Left Key Cylinder Switch Fault (B2252) in my GMC vehicle?

To diagnose B2252, you can use an OBDII scanner to read the trouble code, inspect the left key cylinder switch and its wiring for any visible damage, and test the ignition key for proper functionality.

4. Is it safe to continue driving with the B2252 code present in my GMC vehicle?

It is not recommended to drive with the B2252 code as it can lead to potential issues with starting the vehicle or other electrical problems. It is best to address the issue promptly.

5. Can I repair the Left Key Cylinder Switch Fault (B2252) in my GMC vehicle myself?

If you have experience with automotive repairs and the necessary tools, you may be able to replace the left key cylinder switch or repair any damaged wiring yourself. However, it is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Will resetting the OBDII code B2252 resolve the issue temporarily?

Resetting the B2252 code may temporarily clear the warning light, but it will not fix the underlying issue causing the Left Key Cylinder Switch Fault. It is important to diagnose and repair the root cause of the problem.

7. How much does it typically cost to repair the B2252 code in a GMC vehicle?

The cost of repairing the B2252 code can vary depending on the extent of the damage and whether you choose to replace the left key cylinder switch yourself or have a mechanic do the repair. Costs can range from $100 to $300 or more.

8. Are there any preventive measures to avoid triggering the B2252 code in a GMC vehicle?

To prevent the Left Key Cylinder Switch Fault (B2252), you can avoid using excessive force when turning the ignition key, ensure your key is not damaged or worn, and regularly inspect the key cylinder switch for any signs of wear or malfunction.

9. Can extreme weather conditions affect the occurrence of the B2252 code in a GMC vehicle?

Extreme weather conditions, especially cold temperatures, can sometimes exacerbate issues with the key cylinder switch, leading to the B2252 code. It is important to keep your ignition key and key cylinder well-maintained in all weather conditions.

10. How long does it typically take to repair the B2252 code in a GMC vehicle?

The repair time for the B2252 code can vary depending on the exact cause of the fault and the expertise of the mechanic. In general, replacing the left key cylinder switch or repairing related wiring can take anywhere from 1 to 3 hours.