AutoCodes – GMC – C0550 GMC

C0550 GMC Code - Electronic Control Unit

Quick Answer

This is an internal fault detection of the Transfer Case Shift Control Module (TCCM). Common causes include Faulty Transfer Case Shift Control Module (TCCM), Transfer Case Shift Control Module (TCCM) harness is open or shorted, Transfer Case Shift Control Module (TCCM) 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: C0550 GMC indicates Electronic Control Unit.
Common causes: Common causes include Faulty Transfer Case Shift Control Module (TCCM), Transfer Case Shift Control Module (TCCM) harness is open or shorted, Transfer Case Shift Control Module (TCCM) 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 14,367

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 Jun 27, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0550 GMC Description

This is an internal fault detection of the Transfer Case Shift Control Module (TCCM). This fault is handled inside the TCCM. No external circuits are involved.
At each power-up, the TCCM runs a self-test on the following:
- EEPROM Checksum
- ROM Checksum
- RAM Checksum
- RAM Malfunction

OBDII Code C0550 GMC - Electronic Control Unit - AutoCodes.com — C0550 GMC Code - Electronic Control Unit

What does this mean?

What are the Possible Causes of the DTC C0550 GMC?

Faulty Transfer Case Shift Control Module (TCCM)
Transfer Case Shift Control Module (TCCM) harness is open or shorted
Transfer Case Shift Control Module (TCCM) circuit poor electrical connection

How to Fix the DTC C0550 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 C0550 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 C0550 GMC code?

Need more information on how to fix the C0550 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 C0550 GMC Code

1. What does OBDII code C0550 for a GMC indicate?

The OBDII code C0550 for GMC refers to a problem with the Electronic Control Unit (ECU) calibration.

2. What are common symptoms of OBDII code C0550 in a GMC vehicle?

Common symptoms of OBDII code C0550 in a GMC vehicle include issues with the electronic stability control system, traction control system, and possibly the engine performance.

3. What are the possible causes of OBDII code C0550 in a GMC?

Possible causes of OBDII code C0550 in a GMC include a faulty ECU, wiring issues, or software calibration problems.

4. How can I diagnose the OBDII code C0550 in my GMC?

Diagnosing OBDII code C0550 in a GMC typically involves using a diagnostic scanner to retrieve the code, checking for any related symptoms, and inspecting the ECU and associated wiring for any visible issues.

5. Can I continue driving my GMC with OBDII code C0550 present?

It is not recommended to continue driving your GMC with OBDII code C0550 present, as it can potentially affect the vehicle's electronic stability control system and traction control system.

6. How can I repair OBDII code C0550 in my GMC?

Repairing OBDII code C0550 in a GMC may involve reprogramming the ECU, repairing or replacing any damaged wiring, or replacing the ECU itself if necessary.

7. Is it possible to clear OBDII code C0550 in a GMC without fixing the underlying issue?

Clearing OBDII code C0550 in a GMC without fixing the underlying issue is not recommended, as the problem may persist and potentially lead to further issues down the line.

8. How can I prevent OBDII code C0550 from occurring in my GMC?

To prevent OBDII code C0550 from occurring in your GMC, it is essential to properly maintain the vehicle, address any warning lights promptly, and follow the manufacturer's recommended maintenance schedule.

9. Can a DIY enthusiast fix OBDII code C0550 in a GMC?

While some DIY enthusiasts may be able to address OBDII code C0550 in a GMC by following repair guides and using the necessary tools, it is recommended to consult with a professional mechanic for accurate diagnosis and repair.

10. How much does it cost to repair OBDII code C0550 in a GMC?

The cost of repairing OBDII code C0550 in a GMC can vary depending on the underlying issue, the extent of the repair needed, and labor rates in your area. It is advisable to obtain quotes from different repair shops for an accurate estimate.