P0117 on Chrysler: How to Diagnose & Fix
Engine Coolant Temperature Sensor Circuit Low
1 Chrysler model · 1 documented issue · $150-$600 repair
P0117 on Chrysler by model: symptoms, diagnosis and fix
The Chrysler 3.5L V6 engine in the Prowler uses aluminum coolant crossover tubes that develop leaks at the O-ring seals and crimped connections. The crossover tubes run across the top of the engine between the cylinder heads and are exposed to high heat. The O-rings harden and shrink, allowing coolant to seep. The Prowler's unique front-end design with exposed engine makes the leak visible but also means the engine compartment lacks the heat shielding of a conventional car.
Common Symptoms
- Coolant dripping from top of engine
- Sweet coolant smell from engine bay
- Low coolant warning light
- Visible coolant residue on engine between cylinder heads
- Engine overheating in traffic
How to Fix
Replace the coolant crossover tube O-rings with Viton (fluoroelastomer) O-rings that resist heat better than the OEM rubber seals. The tubes must be removed for O-ring access. Inspect the aluminum tubes for corrosion pitting and replace if pitted. Flush the cooling system and use Mopar antifreeze/coolant. Replace the thermostat during the repair.
Sources for this issue (1)
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 Chrysler?
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 Chrysler it is documented across 1 model: Prowler.
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 Chrysler?
Published repair estimates on Chrysler range from $150 to $600 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.