P0117 on Dodge: How to Diagnose & Fix
Engine Coolant Temperature Sensor Circuit Low
1 Dodge model · 1 documented issue · 1 critical · $800-$1,500 repair
P0117 on Dodge by model: symptoms, diagnosis and fix
The 2.0L engines are prone to head gasket failure, causing external coolant leaks, white exhaust smoke, and eventual overheating. The SOHC engines are more commonly affected than the DOHC variant.
Common Symptoms
- White smoke from exhaust
- Coolant loss with no visible leak
- Overheating
- Milky oil on dipstick
How to Fix
Replace head gasket with multi-layer steel (MLS) upgrade gasket. Have cylinder head checked for warpage and resurfaced if necessary. Replace head bolts (torque-to-yield design, not reusable).
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 Dodge?
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 Dodge it is documented across 1 model: Neon.
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 Dodge?
Published repair estimates on Dodge range from $800 to $1,500 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.