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 MANUALSCHEVROLET2000CHEVY EXPRESS G3500, VAN CARGO, 4.3 WREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM SELF-DIAGNOSTICS - GASOLINE - 4.3L, 5.0L, 5.7L & 7.4LDIAGNOSTIC TESTSDTC U1041: LOSS OF EBCM COMMUNICATIONDIAGNOSTIC PROCEDURES
2000 Chevrolet Chevy Express G3500, Van Cargo, 4.3 W
Diagnostic Procedures
2000 Chevrolet Chevy Express G3500, Van Cargo, 4.3 WSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK . After performing OBD system check, go to next step.
- Using scan tool, check if scan tool communicates with EBCM. If scan tool communicates with EBCM, go to next step. If scan tool does not communicate with EBCM, see appropriate ANTI-LOCK article in BRAKES.
- Using scan tool, select EBCM function. Check if DTC U1041 is stored in ATC memory. If DTC is stored, see appropriate ANTI-LOCK article in BRAKES. If DTC U1041 is not set, go to next step.
- Check for short or open in class 2 serial data circuit between VCM and ATC. Check for faulty connections at DLC, VCM or ATC. Repair as necessary. After repairs, go to step 8. If circuit or connections are okay, go to next step.
- Reconnect all previously disconnected components. Using scan tool, clear DTCs. Turn ignition off for 15 seconds. Turn ignition on, with engine off. Check if DTC resets. If DTC resets, go to next step. If DTC does not reset, go to step 7.
- Replace VCM. Program VCM using required equipment and perform VTD and Crankshaft Variation Learn Procedure. After replacing VCM, go to next step.
- DTC is intermittent. Check for additional DTCs. If additional DTCs are set, diagnose affected DTCs. If no additional DTCs are set, system is okay. See DIAGNOSTIC AIDS .
- Turn ignition off. Reconnect all previously disconnected components. Using scan tool, clear all DTCs. Check if DTC resets. If DTC resets, repeat step 1. If DTC does not reset, 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.