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 MANUALSCHEVROLET2006TRAILBLAZER 6.0 H, AWDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - 6.0L - DTC P0449 TO P2119DTC P1682CIRCUIT/SYSTEM TESTING
2006 Chevrolet TrailBlazer 6.0 H, AWD
Circuit/System Testing
2006 Chevrolet TrailBlazer 6.0 H, AWDSECTION Circuit/System Testing
- If DTCs P0685, P0689, or P0690 are set, test and repair those DTCs first.
- With the ignition ON, and the engine OFF, test for ignition 1 voltage at both test points of the ECM 1 fuse in the underhood fuse block.
- If the ignition 1 voltage is not present on either test point of the ECM 1 fuse, then replace underhood fuse block.
- If the ignition 1 voltage is present on one test point of the ECM 1 fuse, then repair the short to ground in the ignition 1 voltage circuit to the electronic control module (ECM). If the wire circuit tests normal, then replace the ECM.
- If the ignition 1 voltage is present on both test points of the ECM 1 fuse, then inspect and test for loose and corroded terminals at the underhood fuse block electrical connector, and the ECM electrical connectors, which contains the ignition 1 voltage circuit. If the electrical connectors test normal, then repair the ignition 1 voltage circuit, for an open or high resistance. All wire circuit resistance should measure 2 ohms or less. If the wire circuit tests normal, then replace the ECM.
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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.