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 MANUALSAUDI2005A6 3.2 TREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 93 (5.2L - GENERIC SCAN TOOL, ENGINE CODE(S): BXA (ST-GENERIC SCAN TOOL))ST - GENERIC SCAN TOOLDIAGNOSTIC TROUBLE CODE (DTC) TABLESSAE U0XXX-DTCSCONTROL MODULE AND OUTPUT SIGNALS

2005 Audi A6 3.2 T

Control module and output signals

2005 Audi A6 3.2 TSECTION Control module and output signals

WARNING: This page is about a different car, the 2009 Audi S6, 2008 Audi S6, and 2007 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.

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	Check terminal resistance of CAN-Bus → CAN-Bus terminal resistance, checking .	CAN message, No feedback			Continuous 2 DCY
U0037	Vehicle Communication Bus B	Check terminal resistance of CAN-Bus → CAN-Bus terminal resistance, checking .	Can-Bus	---	---	Continuous 2 DCY
U0100	Lost Communication With ECM/PCM "A"	Check terminal resistance of CAN-Bus → CAN-Bus terminal resistance, checking .	Time out check, no feedback		2.5 Seconds	Continuous 2 DCY
U0101	Lost Communication with TCM	Check terminal resistance of CAN-Bus between Engine Control Module (ECM) J623 and Transmission Control Module (TCM) J217. Refer to → CAN-Bus terminal resistance, Transmission Control Module (TCM) J217 to Engine Control Module (ECM) J623, checking .	Not active		0.5 Seconds	Continuous 2 DCY
U0115	Lost Communication With ECM/PCM "B"	Check terminal resistance of CAN-Bus → CAN-Bus terminal resistance, checking .	Time out check, no feedback		2.5 Seconds	Continuous 2 DCY
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	Check terminal resistance of CAN-Bus → CAN-Bus terminal resistance, checking .	Not active		2.5 Seconds	Continuous 2 DCY
U0402	Invalid Data Received from Transmission Control Module	Check terminal resistance of CAN-Bus between Engine Control Module (ECM) J623 and Transmission Control Module (TCM) J217. Refer to → CAN-Bus terminal resistance, Transmission Control Module (TCM) J217 to Engine Control Module (ECM) J623, checking .	Invalid data received from TCM		0.5 Seconds	Continuous 2 DCY

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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.