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 MANUALSAUDI2009A6 BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 23 (4.2L - GENERIC SCAN TOOL, ENGINE CODE(S): BVJ (ST-GENERIC SCAN TOOL))ST - GENERIC SCAN TOOLDIAGNOSTIC TROUBLE CODE TABLESSAE U0XXX DTCSCONTROL MODULE AND OUTPUT SIGNALS
2009 Audi A6 Base
Control module and output signals
2009 Audi A6 BaseSECTION Control module and output signals
WARNING: This page is about a different variant/trim than selected.
| DTC | Error Message | Diagnostic Procedure | Malfunction Criteria and Threshold Value | Secondary Parameters with Enable Conditions | Monitoring Time Length | Frequency of checks, MIL Illum |
|---|---|---|---|---|---|---|
| U0001 | High Speed CAN Communication Bus |
|
CAN message, No feedback |
|
||
| U0101 | Lost Communication with TCM |
|
Not active | 0.5 Seconds |
|
|
| U0402 | Invalid Data Received from Transmission Control Module |
|
Invalid data received from TCM | 0.5 Seconds |
|
RENDER: 1.0x
NO RELATED
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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.