AutoCodes – Cadillac – B2252 Cadillac

B2252 Cadillac 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 Cadillac 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 488

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

What does this mean?

What are the Possible Causes of the DTC B2252 Cadillac?

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 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 B2252 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.

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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 Cadillac Code

1. What does the OBDII code B2252 mean on a Cadillac?

The B2252 code indicates a "Left Key Cylinder Switch Fault," meaning there is an issue with the switch or wiring in the driver's side door lock cylinder.

2. What are common symptoms of the B2252 code on a Cadillac?

Common symptoms include the inability to lock or unlock the driver's door using the key, a malfunctioning anti-theft system, or the door lock behaving erratically.

3. What causes the B2252 code to appear on a Cadillac?

This code can be triggered by a faulty key cylinder switch, damaged wiring or connectors, corrosion, or an issue with the body control module (BCM).

4. Can a B2252 code affect the anti-theft system on my Cadillac?

Yes, a malfunction in the key cylinder switch can interfere with the anti-theft system, potentially preventing the vehicle from starting or causing security system warnings.

5. How do I diagnose the B2252 code on my Cadillac?

Diagnose the code by inspecting the key cylinder switch for wear or damage, checking the wiring and connectors for continuity, and scanning the BCM for related faults.

6. Is the B2252 code a serious issue?

While not critical for driving, it can impact locking and anti-theft functions, so it should be addressed promptly to avoid further complications.

7. Can I still drive my Cadillac with the B2252 code?

Yes, you can drive, but the door locking system and anti-theft features may not work properly, increasing the risk of theft or inconvenience.

8. How is the B2252 code fixed on a Cadillac?

Repairs may involve replacing the left key cylinder switch, repairing damaged wiring, cleaning corroded connectors, or reprogramming the BCM.

9. How much does it cost to fix the B2252 code on a Cadillac?

The cost depends on the exact issue but typically ranges from $150 to $400, depending on whether the key cylinder switch or related wiring needs repair.

10. Can I fix the B2252 code on my Cadillac myself?

If you're experienced with automotive repairs, you can try inspecting and replacing the key cylinder switch or repairing wiring, but more complex issues may require professional help.