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 604 (DATA LINK COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U1001 TO U1254: MODULE U1XXX COMMUNICATIONNOTES
1998 Chevrolet Suburban K2500, 7.4 J, Part Time
DTC U1001 To U1254: Module U1XXX Communication: Notes
1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Notes
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
DTC U1001-U1254
| Control Module | ID Number |
|---|---|
| PCM | 016 |
| ECM | 017 |
| TCM | 024 |
| EBCM | 040 |
| BCM | 064 |
| SDM | 088 |
| IPC | 096 |
| HUD | 098 |
| Radio | 128 |
| VIU | 146 |
| HVAC | 152 |
| MSM | 166 |
| Theft Deterrent Control Module | 192 |
When more than one Loss of Communication DTC is set in either one module or in several modules, diagnose the DTCs in the following order:
- Current DTCs before history DTCs unless told otherwise in the diagnostic tables.
- The DTC which is reported the most times.
- From the lowest number DTC to the highest number DTC.
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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.