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 MANUALSCHEVROLET1999SUBURBAN C2500, 6.5 FREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM - TESTS W/CODES - DTC P1537-U1193DTC U1041DTC U1041: LOSS OF EBCM COMMUNICATION (2.2L "S" SERIES)DIAGNOSTIC PROCEDURES
1999 Chevrolet Suburban C2500, 6.5 F
Diagnostic Procedures
1999 Chevrolet Suburban C2500, 6.5 FSECTION Diagnostic Procedures
- Perform On-Board Diagnostic (OBD) system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS INTRODUCTION article. After performing OBD system check, go to next step.
- Turn ignition on, with engine off. Using scan tool, check if scan tool can display data from PCM. If data can be displayed, go to next step. If data cannot be displayed , diagnose Data Link Connector (DLC) circuit.
- Using scan tool, check if scan tool can display EBCM data. If data can be displayed, go to next step. If data cannot be displayed, diagnose electrical system.
- Check for intermittent short or open in serial data circuit to BFC. Repair as necessary. After repairs, go to step 6. If circuit is okay, go to next step.
- Using scan tool, check for additional DTCs or communication with other modules. Diagnose or repair as necessary. After repairs, go to next step.
- Using scan tool, select CLEAR INFO or CLEAR DTCs function to clear DTCs. Turn ignition on, with engine off. Using scan tool, review FREEZE FRAME data and note parameters. Start engine and operate vehicle within conditions required for setting this DTC, and as close to conditions recorded in FREEZE FRAME as possible. Monitor SPECIFIC DTC info for this DTC until this DTC test runs. If scan tool indicates that this test failed in this ignition, repeat step 2. If scan tool does not indicate that this test failed in this ignition, go to next step.
- Check for additional DTCs. Diagnose affected DTCs. If no other DTCs are set, see DIAGNOSTIC AIDS .
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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.