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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 563 (STARTING SYSTEM)DIAGNOSTIC INFORMATIONDTC B1327TESTING
2003 Chevrolet TrailBlazer 4.2 S, 4WD
DTC B1327: Testing
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Testing
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
- Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL .
- Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the BATTERY VOLTAGE parameter in the AFFECTED MODULE DATA LIST. Or with a DMM, measure the battery voltage at the appropriate circuit of the module. Does the voltage measure greater than the specified value of 9.4V? If so, go to step 6. If not, go to next step.
- Turn OFF the ignition. Disconnect the harness connector of the module setting the DTC B1327. Measure the voltage between the battery positive voltage circuit of the module setting the DTC B1327 and the ground circuit of the module setting the DTC B1327. Does the voltage measure greater than the specified value of 9.4V? If so, go to step 6. If not, go to next step.
- Test the batter positive voltage circuit of the module setting the code for a high resistance or an open. Did you find and correct the condition? If so, go to step 8. If not, go to next step.
- Test the ground sense circuit of the module setting the code for a high resistance or an open. Did you find and correct the condition? If so, go to step 8. If not, go to next step.
- Inspect for poor connections at the harness connector of the module setting the DTC. Did you find and correct the condition? If so, go to step 8. If not, go to next step.
- Replace the module setting the DTC. After replacement is complete, go to next step.
- Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. See CONDITIONS FOR RUNNING THE DTC . Does the DTC reset? If so, go to step 2. If not, then system is okay.
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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.