Electronic Control Unit
Table of contents
C0550 GMC Possible Causes
- 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 do I fix code C0550 GMC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the C0550 GMC code
The cost of diagnosing the C0550 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
Possible Symptoms
- Anti-Lock Brake System (ABS) Warning Light ON
- Engine Light ON (or Service Engine Soon Warning Light)
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