AutoCodes – Cadillac – C0406 Cadillac

C0406 Cadillac Code - Transfer Case Solenoid Valve Control Circuit High Current

Quick Answer

The rear drive clutch solenoid valve is internal to the torque transfer device housing. Common causes include Faulty Transfer Case Solenoid Valve, Transfer Case Solenoid Valve harness is open or shorted, Transfer Case Solenoid Valve 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: C0406 Cadillac indicates Transfer Case Solenoid Valve Control Circuit High Current.
Common causes: Common causes include Faulty Transfer Case Solenoid Valve, Transfer Case Solenoid Valve harness is open or shorted, Transfer Case Solenoid Valve 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 898

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 Jul 04, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0406 Cadillac Description

The rear drive clutch solenoid valve is internal to the torque transfer device housing. The rear differential clutch control module supplies battery voltage to the control circuit and ground to the low reference circuit of the solenoid valve. The solenoid valve is controlled by a pulse width modulation (PWM) signal. The solenoid valve controls the hydraulic pressure to the clutch package of the torque transfer device. The locking level of the torque transfer device depends on the engagement of the clutch package.

OBDII Code C0406 Cadillac - Transfer Case Solenoid Valve Control Circuit High Current - AutoCodes.com — C0406 Cadillac Code - Transfer Case Solenoid Valve Control Circuit High Current

What does this mean?

What are the Possible Causes of the DTC C0406 Cadillac?

Faulty Transfer Case Solenoid Valve
Transfer Case Solenoid Valve harness is open or shorted
Transfer Case Solenoid Valve circuit poor electrical connection

How to Fix the DTC C0406 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 C0406 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 C0406 Cadillac code?

Need more information on how to fix the C0406 Cadillac 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 C0406 Cadillac Code

1. What are the common symptoms of OBDII code C0406 in a Cadillac related to the Transfer Case Solenoid Valve Control Circuit High Current?

The common symptoms include the Service 4WD light illuminated on the dashboard, difficulty shifting gears, and potential loss of functionality in the 4WD system.

2. What are the possible causes of OBDII code C0406 in a Cadillac?

The code C0406 typically indicates a problem with the transfer case solenoid valve control circuit, which may be caused by issues like a faulty solenoid, damaged wiring, or a poor connection.

3. How can I diagnose the OBDII code C0406 in my Cadillac?

Diagnosing code C0406 involves using a diagnostic scanner to retrieve the trouble codes, conducting a visual inspection of the wiring and connections, testing the solenoid valve, and checking the transfer case control module for any faults.

4. Is it safe to continue driving my Cadillac with OBDII code C0406 present?

It is not recommended to drive your Cadillac with code C0406 present, as it can lead to further damage to the transfer case components and potentially compromise the vehicle's drivability and safety.

5. Can I repair OBDII code C0406 in my Cadillac on my own?

Repairing code C0406 may require advanced automotive knowledge and tools. It is recommended to consult a professional mechanic or dealership for proper diagnosis and repair to ensure the issue is resolved correctly.

6. How much does it typically cost to repair OBDII code C0406 in a Cadillac?

The cost of repairing code C0406 in a Cadillac can vary depending on the specific cause of the issue, parts needed for replacement, and labor costs. It's advisable to obtain estimates from reputable repair shops or dealerships.

7. Are there any preventive maintenance tips to avoid OBDII code C0406 in a Cadillac?

To prevent OBDII code C0406, it's essential to perform regular maintenance on your Cadillac, including checking the 4WD system components, ensuring proper fluid levels, and addressing any warning signs promptly.

8. What other OBDII codes may be related to or triggered by OBDII code C0406 in a Cadillac?

Codes related to the transfer case, solenoid valves, or control circuits, such as C0405, C0407, or P2761, may be triggered alongside or as a result of OBDII code C0406 in a Cadillac.

9. Can extreme weather conditions affect the occurrence of OBDII code C0406 in a Cadillac?

Extreme weather conditions, especially cold temperatures, can potentially exacerbate issues related to the transfer case solenoid valve control circuit, leading to the triggering of code C0406 in a Cadillac.

10. How urgent is it to address OBDII code C0406 in a Cadillac?

It is advisable to address OBDII code C0406 promptly to prevent further damage to the transfer case components and ensure the proper functioning of the 4WD system in your Cadillac.