AutoCodes – Chevrolet – C0402 Chevrolet

C0402 Chevrolet Code - Transfer Case Solenoid Valve

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: C0402 Chevrolet indicates Transfer Case Solenoid Valve.
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 1,934

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
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C0402 Chevrolet 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 C0402 Chevrolet - Transfer Case Solenoid Valve - AutoCodes.com — C0402 Chevrolet Code - Transfer Case Solenoid Valve

What does this mean?

What are the Possible Causes of the DTC C0402 Chevrolet?

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 C0402 Chevrolet?

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 does this mean?

Code Tech Notes

- C0402 02 Transfer Case Solenoid Valve Short to Ground
- C0402 04 Transfer Case Solenoid Valve Open
- C0402 42 Transfer Case Solenoid Valve Calibration Not Programmed
- C0402 43 Transfer Case Solenoid Valve EEPROM Incorrect Programming
- C0402 4B Transfer Case Solenoid Valve Calibration Not Learned
- C0402 61 Transfer Case Solenoid Valve Stuck

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C0402 Chevrolet 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 C0402 Chevrolet Code

What does OBDII code C0402 mean for a Chevrolet vehicle?

OBDII code C0402 indicates a malfunction in the transfer case solenoid valve, which controls the operation of the transfer case in four-wheel drive systems.

What are the common symptoms of the C0402 code?

Common symptoms may include the transfer case not shifting properly, difficulty engaging four-wheel drive, warning lights on the dashboard, or unusual noises from the transfer case.

What could cause the C0402 code to trigger?

Causes may include a faulty transfer case solenoid valve, wiring issues such as shorts or open circuits, or a malfunctioning transfer case control module.

How can I diagnose the C0402 code?

Begin with a visual inspection of the wiring and connectors related to the transfer case solenoid valve. Use an OBDII scanner to check for additional codes and perform a functional test of the solenoid.

Is it safe to drive with the C0402 code present?

While it may be safe to drive short distances, the vehicle may have limited four-wheel drive functionality, which could be unsafe in adverse conditions. It's advisable to have the issue addressed promptly.

What are some potential repairs for the C0402 code?

Repairs may include replacing the transfer case solenoid valve, repairing or replacing damaged wiring, or reprogramming or replacing the transfer case control module.

How much does it typically cost to fix the C0402 code?

Repair costs can vary widely; replacing the transfer case solenoid valve may range from $100 to $400, depending on labor rates and parts prices.

Can I reset the C0402 code after repairs?

Yes, you can reset the code using an OBDII scanner after making the necessary repairs. However, ensure that the underlying issue is resolved to prevent the code from reappearing.

Will the C0402 code affect my vehicle's fuel efficiency?

While the C0402 code itself may not directly impact fuel efficiency, issues with the transfer case can lead to increased drag or improper engagement, potentially affecting overall performance and efficiency.

How often should I have my transfer case system checked?

It's recommended to have the transfer case system inspected during regular maintenance intervals, typically every 30,000 to 50,000 miles, or if you experience any related symptoms.