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 MANUALSCHEVROLET2001EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSINFORMATION BUSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH EBCM
2001 Chevrolet Express 1 Ton Van V8-5.7L VIN R
Scan Tool Does Not Communicate With EBCM
2001 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION Scan Tool Does Not Communicate With EBCM
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
1. A module which loses power during an ignition cycle will cause other modules to set Lost Communication DTCs.
2. A module which loses power during an ignition cycle will cause other modules to set Lost Communication DTCs.
5. The EBCM which was not communicating may have detected a short to voltage on one or both of the front low reference circuits of the wheel speed sensors. This step checks for a short to voltage in these low reference circuits in the front wheel speed sensors.
7. The module which was not communicating due to an open in the serial data circuit may have set Lost Communication DTCs for those modules that it was monitoring.
Steps 1-8:
The numbers below refer to the step numbers on the diagnostic table.
1. A module which loses power during an ignition cycle will cause other modules to set Lost Communication DTCs.
2. A module which loses power during an ignition cycle will cause other modules to set Lost Communication DTCs.
5. The EBCM which was not communicating may have detected a short to voltage on one or both of the front low reference circuits of the wheel speed sensors. This step checks for a short to voltage in these low reference circuits in the front wheel speed sensors.
7. The module which was not communicating due to an open in the serial data circuit may have set Lost Communication DTCs for those modules that it was monitoring.
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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.