P0117 on Volvo: How to Diagnose & Fix
Engine Coolant Temperature Sensor Circuit Low
1 Volvo model · 1 documented issue · $200-$800 repair
P0117 on Volvo by model: symptoms, diagnosis and fix
The T6 twin-charged (supercharged + turbocharged) 2.0L 4-cylinder develops cracks in the turbocharger coolant supply and return lines. The plastic quick-connect fittings and the rigid coolant lines become brittle from heat cycling in the confined engine bay. A cracked line causes coolant loss that can lead to turbo damage from overheating. The leak is often small and difficult to locate visually because it evaporates on the hot turbo housing.
Common Symptoms
- Low coolant warning with no visible puddle
- Sweet coolant smell from engine bay
- Small amount of steam from turbo area
- Coolant residue visible on turbo housing
- Engine running hotter than normal after extended driving
How to Fix
Replace the cracked coolant line with an updated Volvo part. Some owners upgrade to silicone coolant hoses from IPD or FCP Euro for better heat resistance. Inspect all turbo coolant connections during regular service. Top off the cooling system and pressure test after repair to verify no additional leaks.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Volvo 31319352 turbocharger coolant junction hose
replace a pressure-tested leaking rubber junction section connecting the two turbo coolant lines to the cooling system Fitment/availability: Documented 2017-2021 Volvo V90 Cross Country T6 B4204T27 branch using 31319352; two are used per…
- Genuine Volvo 31368529 turbo coolant pipe assembly
replace the diagnosed leaking rigid turbo coolant pipe assembly rather than a sound adjacent hose Fitment/availability: V90 Cross Country T6 branch whose VIN and installed pipe number confirm 31368529; confirm model-year supersession and…
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Owner tips & cautions
- TipInspect turbo coolant lines during every oil change — catching a crack early prevents turbo damage from coolant starvation
- WarningDo not ignore low coolant warnings — the turbocharger relies on coolant for bearing lubrication and heat management. Running dry destroys the turbo ($2,000+ replacement)
P0117 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0117 mean on a Volvo?
P0117 stands for "Engine Coolant Temperature Sensor Circuit Low." This code means the engine coolant temperature (ECT) sensor is reading too low a voltage, which the computer interprets as an impossibly high coolant temperature. In most cases this is an electrical fault — such as a short to ground in the wiring — rather than the engine actually overheating. The coolant temperature signal affects fuel mixture, cooling fans, and other functions, so a bad reading can cause poor running, hard starting, or fans running constantly. The fault is usually in the sensor or its wiring. On Volvo it is documented across 1 model: V90 Cross Country.
What are the most common causes of P0117?
The most common causes of P0117 are: Faulty engine coolant temperature sensor, Short to ground in the sensor signal wire, Damaged or corroded wiring/connector at the sensor, Coolant contamination affecting the sensor, Poor electrical ground, Faulty PCM/ECM (less common). The specific cause varies by vehicle.
How much does it cost to fix P0117 on a Volvo?
Published repair estimates on Volvo range from $200 to $800 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0117 on a different make?
View P0117 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.