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 MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 80 (BODY CONTROL MODULES)SELF-DIAGNOSTIC SYSTEMBODY REAR END SYSTEM DIAGNOSTIC SYSTEM CHECK
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
Body Rear End System Diagnostic System Check
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Body Rear End System Diagnostic System Check
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use this check as starting point for any body rear end system complaint.
- Turn ignition switch to OFF position. Connect scan tool to Data Link Connector (DLC). Turn ignition switch to RUN position. If scan tool powers up, go to next step. If scan tool does not power up, go to TEST D: SCAN TOOL DOES NOT POWER UP under SYSTEM TESTS.
- Turn ignition switch to RUN position. Try to establish scan tool communication with Body Control Module (BCM). If communication with BCM is established, go to next step. If communication with BCM is not established, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Select DISPLAY DTC function for BCM. Record all displayed DTCs and status of displayed DTCs. If any DTCs are displayed, go to next step. If no DTCs are displayed, repair trunk release system as necessary. See appropriate POWER DOOR LOCKS & TRUNK RELEASE article.
- Using scan tool, retrieve DTCs. If DTCs U1000-U1305 are not present, go to next step. If DTCs U1000-U1305 are present, go to TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE under SYSTEM TESTS.
- Check for DTC B1000. If DTC is not present, go to next step. If DTC B1000 is present, go to DTC B1000: CONTROL MODULE MALFUNCTION under DIAGNOSTIC TESTS.
- Check for DTC B1295. If scan tool displays DTC C1295, perform appropriate test. See appropriate ANTI-LOCK article in BRAKES. If scan tool does not display DTC C1295, go to DIAGNOSTIC TROUBLE CODE DEFINITIONS . Repair as necessary.
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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.