Diagnostic trouble code P0115 on Audi vehicles — what it means, the common
causes, and how to confirm the real fault before replacing parts.
What does P0115 mean?
P0115 indicates: Engine Coolant Temperature Circuit.
This relates to the Fuel & air metering system.
Common causes of P0115
fault identified in coolant temperature sensor circuit (G62)
low coolant level causing overtemperature or undertemperature conditions
overvoltage in pump/sensor circuit (voltage > 20 V)
What to check (live data)
Measuring value block 109 (Audi A6) for coolant pump diagnosis
pump speed percentage (reduced to 80% or 50% under fault conditions)
voltage supply (overvoltage threshold > 20 V causes pump shutdown)
pump electronics temperature (shutdown threshold > 160 °C)
Parts often involved in P0115
Engine Coolant Temperature Sensor G62
Engine Temperature Control Sensor G694
Map Controlled Engine Cooling Thermostat F265
coolant pump
Don't replace parts until the root cause is confirmed — many of these codes are caused by wiring, a connector or an upstream fault, not the part itself.
Get the confirmed root cause for P0115 — on YOUR vehicle
A code is a symptom, not a diagnosis. AutoDX Pro cross-checks several
independent assessments, pinpoints the actual root cause, gives you the
exact tests to confirm it, and shows the parts — only after the cause is
confirmed. Reads your scan-tool photo and decodes your VIN with open
recalls.
P0115 is a diagnostic trouble code: Engine Coolant Temperature Circuit.
What are the common causes of P0115 on an Audi?
Common causes include: fault identified in coolant temperature sensor circuit (G62), low coolant level causing overtemperature or undertemperature conditions, overvoltage in pump/sensor circuit (voltage > 20 V). The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving an Audi with P0115?
It depends on the fault and your symptoms. Some causes are minor, others can damage components or affect safety. Get the root cause confirmed before deciding.
How do I fix P0115 on an Audi?
Confirm the actual root cause with targeted tests first, then replace only the part that's at fault. AutoDX Pro gives you the root cause, the exact tests, and the parts for P0115 on your specific Audi.