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.
Engine Control Module Reprogramming
After replacing ECM or if program needs to be updated, refer to latest Techline information on ECM reprogramming. Before programming a ECM, the following must be observed, or ECM damage may occur:
- The Tech 2 and terminal must have the latest software.
- Vehicle battery must be fully charged. Battery voltage should be 12-14 volts.
- The Tech 2 and terminal cable connections must be secure.
- A battery charger must NOT be connected to the battery when programming ECM.
After reprogramming, perform and PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS .
To reprogram ECM, perform the Pass-Thru Programming. See SERVICE PROGRAMMING SYSTEM PASS-THRU 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.