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 CARSECTION 53 (4.2L V8 5V GENERIC SCAN TOOL, ENGINE CODE(S): BNK)ST GENERIC SCAN TOOLDIAGNOSTIC TROUBLE CODE (DTC) TABLESSAE P0XXX-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 car, the 2006 Audi A6 and 2005 Audi A6. However, it is still accessible from the selected car via links, so may be relevant.

SAE-DTC	DTC text	Corrective action
P0600	Serial Communication Link	Eliminate malfunction in Can-bus components according to the wiring diagram.
P0601	Internal Control Module Memory Check Sum Error	Replace Engine Control Module (ECM) J623 → Engine Control Module (ECM) J623, replacing .
P0602	Control module programming error
P0603	Internal Control Module Keep Alive Memory (KAM) Error	Replace Transmission Control Module (TCM) J217 → Transmission Control Module (TCM) J217, replacing .
P0604	Internal Control Module Random Access Memory (RAM) Error	Replace Engine Control Module (ECM) J623 → Engine Control Module (ECM) J623, replacing . Replace Transmission Control Module (TCM) J217 → Transmission Control Module (TCM) J217, replacing .
P0605	Internal Control Module Read Only Memory (ROM) Error
P0606	ECM/PCM Processor
P0607	Control Module Performance
P0614	ECM/TCM Incompatible
P0627	Fuel Pump A Control circuit open	Check Fuel Pump (FP) Relay J17 → Fuel Pump (FP) Relay J17, checking .
P0629	Fuel Pump A Control circuit high
P0634	PCM/ECM/TCM Internal Temperature Too High	Check ATF level: → 37 - AUTOMATIC TRANSMISSION - CONTROLS, HOUSING Mechanical malfunction in transmission
P0638	Throttle Actuator Control Range/Performance Bank 1	Check Throttle Valve Control Module J338 → Throttle Valve Control Module J338, checking . Check Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185 → Throttle Position (TP) Sensor G79/Accelerator Pedal Position Sensor 2 G185, checking .
P0641	Sensor Reference Voltage A Circuit/Open	Check voltage supply for the Transmission Control Module (TCM) J217 → Voltage supply for the Transmission Control Module (TCM) J217, checking .
P0685	ECM/PCM Power Relay Control Circuit/Open	Check voltage supply for Engine Control Module (ECM) J623 → Engine Control Module (ECM) J623 voltage supply, checking . Check Motronic Engine Control Module (ECM) Power Supply Relay J271 → Motronic Engine Control Module (ECM) Power Supply Relay J271, checking .
P0686	ECM/PCM Power Relay Control Circuit Low
P0687	ECM/PCM Power Relay Control Circuit High
P0688	ECM/PCM Power Relay Sense Circuit Open

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.