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 MANUALSCHEVROLET2018SPARK LS, STANDARD TRANSREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISDATA COMMUNICATIONS SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESSYMPTOMS - DATA COMMUNICATIONSNOTES
2018 Chevrolet Spark LS, Standard Trans
Symptoms - Data Communications: Notes
2018 Chevrolet Spark LS, Standard TransSECTION Notes
NOTE:
The following steps must be completed before using the symptom tables.
- Perform the Diagnostic System Check - Vehicle
before using the symptom tables in order to verify that all of the following are true:
- There are no Diagnostic Trouble Codes (DTC) set.
- The devices can communicate via the serial data links.
- Review the system operation in order to familiarize yourself with the system functions. Refer to Data Link Communications Description and Operation .
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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.