P0117 means the engine coolant temperature (ECT) sensor circuit voltage is too low, which the ECU reads as an implausibly high temperature. Because the sensor is a thermistor whose resistance falls as it heats, a short to ground or a shorted sensor produces a low voltage that mimics extreme heat. The ECU often responds by running the cooling fan at full speed. Repair typically costs 40 to 180 EUR for a sensor or wiring fix.
DTC/P0117·Volkswagen
P0117 on Volkswagen: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Volkswagen
P0117 on a Volkswagen means the engine coolant temperature (ECT) sensor circuit voltage is too low, which the ECU reads as an implausibly high temperature. Because the sensor is a thermistor whose resistance falls as it heats, a short to ground or a shorted sensor produces a low voltage that mimics extreme heat. The ECU often responds by running the cooling fan at full speed. Repair typically costs 40 to 180 EUR for a sensor or wiring fix.
Repair cost on Volkswagen€12 - €190
What does P0117 mean on a Volkswagen?
Volkswagen Golf
2005-2024VW Golf combined coolant sensors can fail internally and short, producing a pinned-high reading. Connector and clip damage is also common on these sensors, so inspect the four-pin plug for moisture and a secure fit.
What causes P0117 on a Volkswagen?
Beyond the generic causes listed on the main P0117 page, these are the Volkswagen-specific patterns we see most often:
Volkswagen GolfInternally shorted combined coolant sensor
Volkswagen GolfMoisture in the four-pin connector shorting the signal
How to diagnose P0117 on a Volkswagen with OBD2
Follow these steps to pinpoint the root cause of P0117:
- Read the code and watch the live coolant temperature PID with Skanyx. P0117 typically shows the maximum value (often around 120 C or higher) even on a cold engine, which is a clear sign of a low-voltage short rather than a real overheat
- Compare the live coolant reading against actual engine temperature by touching the upper radiator hose; if the engine is cold but the PID reads hot, the circuit is shorted
- Unplug the sensor connector and check whether the reading drops to the open-circuit default; if it does, the sensor itself is likely shorted internally
- Inspect the connector and harness for corrosion, moisture, or a chafe point shorting the signal wire to ground or to the sensor body
- Measure the sensor resistance with a multimeter and compare to the manufacturer table; an abnormally low resistance confirms a failed sensor
- If the sensor and connector are good, test the signal wire for a short to ground back toward the ECU
How much does P0117 cost to fix on a Volkswagen? (EUR)
Estimated repair costs on a Volkswagen (Volkswagen costs align with the average for this code across makes).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0117 on Volkswagen
These codes commonly cluster with P0117 on Volkswagen vehicles:
FAQ: P0117 on Volkswagen
Why does P0117 make the gauge read hot when the engine is cold?
The coolant sensor is a thermistor whose resistance drops as it gets hotter, so a low signal voltage looks identical to a very hot engine. When the circuit shorts to ground, the voltage drops to near zero and the ECU interprets that as maximum temperature, even on a stone-cold engine.
Can I drive with P0117?
For short trips usually yes, but be careful. The ECU thinks the engine is overheating, so it may run the fan flat out and lean the mixture, hurting economy. The real danger is that a false high reading hides genuine overheating, so confirm actual temperature in live data and fix it soon.
Is P0117 the sensor or the wiring?
It can be either. A shorted thermistor inside the sensor is common and easy to confirm by unplugging the connector and checking whether the reading changes. If unplugging does not clear the implausible reading, suspect a signal wire shorted to ground in the harness.
How much does it cost to fix P0117?
If a shorted sensor is the cause, parts are usually 12 to 45 EUR and a DIY swap can be under 50 EUR. A shop sensor replacement runs roughly 60 to 150 EUR. Chasing a wiring short costs more because diagnostic labour is involved.
Looking for the full P0117 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0117 guideSkanyx · Volkswagen
Diagnosing P0117 on your Volkswagen?
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