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 MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 241 (COMPUTER/INTEGRATING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC U1001-U1254DTC DESCRIPTOR
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
DTC Descriptor
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION DTC Descriptor
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
This diagnostic procedure supports the following DTC:
DTC U1XXX Lost communication With XXX Module
DTC U1001-U1254
| Control Module | ID Number |
|---|---|
| BCM | 064 |
| DIC | 097 |
| DRR | 137 |
| EBCM | 040 |
| HUD | 098 |
| HVAC | 153 |
| IPC | 096 |
| PCM | 016 |
| Radio | 128 |
| SDM | 088 |
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.