Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2018SONIC PREMIER, 4D SEDAN, STANDARD TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 80 (TRANSFER CASE - MP 3025G (NQ6))DIAGNOSTIC INFORMATION AND PROCEDURESDTC C0550: ELECTRONIC CONTROL UNIT (ECU)CIRCUIT/SYSTEM VERIFICATION
2018 Chevrolet Sonic Premier, 4D Sedan, Standard Trans
Circuit/System Verification
2018 Chevrolet Sonic Premier, 4D Sedan, Standard TransSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2017 GMC Canyon and 2017 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
- Engine running. Let the engine run for at least 1 minute.
- Ignition OFF for at least 30 seconds to allow for the complete shutdown of the TCCM.
- Ignition ON, verify that DTC C0550 is not set.
- If DTC C0550 sets, reprogram the TCCM. If the DTC resets, replace the TCCM. Perform the ATC motor learn procedure.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.