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 MANUALSCHEVROLET2008OPTRA5 LT, STANDARDREPAIR AND DIAGNOSISGENERAL INFORMATIONRESET PROCEDURESPROGRAMMING AND SETUPDIAGNOSTIC INFORMATION AND PROCEDURESCONTROL MODULE REFERENCES

2008 Chevrolet Optra5 LT, Standard

Control Module References

2008 Chevrolet Optra5 LT, StandardSECTION Control Module References

Control Module	Schematic	Repair Instruction	Programming and Setup
Diagnostic System Check - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle Symptoms - Vehicle
Brake Pressure Modulator Valve (BPMV)	Antilock Brake System Schematics	Brake Modulator Assembly Replacement	-
Inflatable Restraint Sensing and Diagnostic Module	SIR Schematics	Inflatable Restraint Sensing and Diagnostic Module Replacement	-
Engine Control Module	Engine Controls Schematics for the 1.4 L DOHC engine Engine Controls Schematics for the 1.6 L (L91) engine Engine Controls Schematics for the 1.8 L (L79) engine Engine Controls Schematics for the 1.8 L (LDA) engine Engine Controls Schematics for the 2.0 L (Diesel) engine Engine Controls Schematics for the 2.0 L (L34 GMDAT) engine	Engine Control Module Replacement for the 1.4 L DOHC engine Engine Control Module Replacement for the 1.6 L (L91) engine Engine Control Module Replacement for the 1.8 L (L79) engine Engine Control Module Replacement for the 1.8 L (LDA) engine Engine Control Module Replacement for the 2.0 L (Diesel) engine Engine Control Module Replacement for the 2.0 L (L34) engine	Engine Control Module Programming and Setup
Theft Deterrent Module	Theft Deterrent System Schematics	Theft Deterrent Module Replacement	Programming Theft Deterrent System Components (Scan 100) or Programming Theft Deterrent System Components (Tech 2)
Transmission Control Module	Automatic Transmission Controls Schematics for the Aisin (55-51LE) transaxle Automatic Transmission Controls Schematics for the Aisin (81-40LE) transaxle Automatic Transmission Controls Schematics for the ZF 4HP 16 transaxle	Transmission Control Module Replacement for the Aisin (55-51LE) transaxle Transmission Control Module Replacement for the Aisin (81-40LE) transaxle Transmission Control Module Replacement for the ZF 4HP 16 transaxle	Transmission Control Module Programming and Setup

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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.