AutoCodes – GMC – C0403 GMC

C0403 GMC Code - AWD Oil Filter Reverse Valve Stuck Open

Quick Answer

The differential clutch pump delivers hydraulic oil pressure to the rear drive clutch solenoid valve and the rear differential clutch solenoid valve. Common causes include Faulty AWD Oil Filter Reverse Valve, AWD Oil Filter Reverse Valve harness is open or shorted, AWD Oil Filter Reverse 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: C0403 GMC indicates AWD Oil Filter Reverse Valve Stuck Open.
Common causes: Common causes include Faulty AWD Oil Filter Reverse Valve, AWD Oil Filter Reverse Valve harness is open or shorted, AWD Oil Filter Reverse 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,250

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code C0403 GMC Description

The differential clutch pump delivers hydraulic oil pressure to the rear drive clutch solenoid valve and the rear differential clutch solenoid valve. The pump is mounted to the torque transfer device housing. The pressure of the system is calculated by the rear differential clutch control module which monitors the differential clutch pump current levels. When the pressure reaches approximately 3200 kPa (464 psi), the rear differential clutch control module determines that the system pressure has been obtained and deacvitates the differential clutch pump. If a voltage is detected after a predetermined time limit when the pump has been deactivated an error is detected. This condition indicates the pump is spinning backwards.

OBDII Code C0403 GMC - AWD Oil Filter Reverse Valve Stuck Open - AutoCodes.com — C0403 GMC Code - AWD Oil Filter Reverse Valve Stuck Open

What does this mean?

What are the Possible Causes of the DTC C0403 GMC?

Faulty AWD Oil Filter Reverse Valve
AWD Oil Filter Reverse Valve harness is open or shorted
AWD Oil Filter Reverse Valve circuit poor electrical connection

How to Fix the DTC C0403 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 C0403 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.

Need more information about the C0403 GMC code?

Need more information on how to fix the C0403 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0403 GMC code diagnosed by a professional: Find a repair shop in your area

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 C0403 GMC Code

1. What are the common symptoms of a C0403 GMC OBDII code related to the AWD Oil Filter Reverse Valve being stuck open?

- Common symptoms include difficulty shifting gears, decreased fuel efficiency, and a noticeable decrease in overall vehicle performance.

2. What are the possible causes of the AWD Oil Filter Reverse Valve being stuck open and triggering the C0403 code in a GMC vehicle?

- The most common causes include a faulty oil filter reverse valve, electrical issues, or debris obstructing the valve mechanism.

3. How can I diagnose the AWD Oil Filter Reverse Valve issue causing the C0403 code in my GMC vehicle?

- Diagnose the issue by performing a visual inspection of the valve, checking for any electrical faults, and conducting a thorough scan using an OBDII scanner to retrieve specific error codes.

4. Can I continue driving my GMC vehicle with the C0403 OBDII code related to the AWD Oil Filter Reverse Valve issue?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the transmission system and result in costly repairs.

5. What are the repair options for fixing the AWD Oil Filter Reverse Valve stuck open issue causing the C0403 code in a GMC vehicle?

- Repair options include replacing the faulty oil filter reverse valve, clearing the error code using an OBDII scanner, and ensuring proper functioning of the AWD system.

6. How much does it typically cost to repair the AWD Oil Filter Reverse Valve issue triggering the C0403 code in a GMC vehicle?

- The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced, but it may range from $200 to $500.

7. Are there any preventive maintenance tips to avoid the AWD Oil Filter Reverse Valve getting stuck open in a GMC vehicle?

- Regularly servicing the AWD system, checking for any signs of leaks or debris, and ensuring proper lubrication of the valve mechanism can help prevent this issue.

8. Can a DIY enthusiast with basic automotive knowledge attempt to repair the AWD Oil Filter Reverse Valve issue causing the C0403 code in a GMC vehicle?

- While some DIY enthusiasts may be able to diagnose the issue, it is recommended to seek professional help for repairing the AWD system and resolving the C0403 code effectively.

9. How long does it typically take to repair the AWD Oil Filter Reverse Valve issue leading to the C0403 code in a GMC vehicle?

- The repair time can vary depending on the extent of the damage and the availability of replacement parts, but it may take anywhere from a few hours to a full day.

10. Can resetting the OBDII system clear the C0403 code related to the AWD Oil Filter Reverse Valve issue in a GMC vehicle?

- Resetting the OBDII system may temporarily clear the error code, but it is crucial to address the root cause of the problem by repairing the AWD Oil Filter Reverse Valve issue to prevent the code from reoccurring.