P0116 Code: Dodge Charger (2021-2023) - Causes, Symptoms & Fixes

No recalls found in NHTSA database.

P0116 is a relatively common OBD-II trouble code that can show up on modern Dodge Chargers, including 2021–2023 models. This guide focuses on P0116 specifically and provides practical diagnostic steps, common causes, and repair guidance. Data limitations: the provided dataset shows no owner complaints or recalls for this exact combo, so guidance relies on general OBD-II knowledge and Dodge-specific maintenance practices rather than model-wide NHTSA documentation.

CODE MEANING AND SEVERITY

• What the code means: P0116 = Engine Coolant Temperature Sensor Range/Performance. The PCM/ECM detected that the Engine Coolant Temperature (ECT) sensor reading is outside the expected range for the current engine temperature, or the sensor signal is not behaving within its normal parameters.
• How it affects the vehicle: The ECT data informs fuel trimming, spark timing, and cooling strategies. A out-of-range reading can cause improper fuel mixture, inefficient idle, potential rough running, and in some cases can trigger a Check Engine Light (MIL). In mild cases, you may notice minor drivability changes; in more severe cases, the PCM may default to a safe mode, affecting efficiency.
• Severity: Moderate. It is not typically an immediate engine-damage code like some misfire or a critical sensor fault, but continued driving with a faulty ECT reading can lead to poor fuel economy, increased emissions, or overheating if the system runs with incorrect temperature assumptions. It’s best to diagnose and fix promptly to avoid longer-term issues.

COMMON CAUSES ON DODGE CHARGER

• Faulty ECT sensor: The most common cause. Sensor can drift, wear out, or fail open/short, producing out-of-range readings.
• Damaged or corroded wiring/connector: Cracked insulation, loose connector, corrosion, or moisture in the sensor harness can cause signal loss or erratic readings.
• Faulty PCM/ECM calibration or fault: In rare cases, an ECU control module issue or software fault can misinterpret sensor data.
• Thermostat or cooling system issues: A stuck-open thermostat or a cooling system restriction/workable coolant flow can cause expected sensor values to diverge from actual temperatures, confusing the PCM.
• Coolant level or condition issues: Low coolant, wrong coolant type, or air in the cooling system can cause inconsistent temperature readings or sensor measurement anomalies.
• Grounding issues: Bad engine grounding can affect sensor signal stability.
• Intermittent sensor failure: Wiring or connector issues can cause sporadic sensor readings that trigger P0116 intermittently.
• Sensor installation or replacement mistakes: If a replacement ECT sensor is not the correct type or is not properly seated/torqued, readings may be out of spec.
• Other related sensors/inputs affecting data: While P0116 is specifically about ECT range, related codes (P0115, P0117, P0118) can be present if there are broader coolant-temp sensing problems.

SYMPTOMS

• Check Engine Light (MIL) illuminated or intermittent.
• Dash temperature gauge may read abnormally high or low compared to normal behavior, or appear inconsistent.
• Poor or irregular idle or rough running, especially at cold starts or during warm-up.
• Fluctuating or reduced fuel economy; inconsistent engine performance.
• Possible hesitation or reduced power, especially during acceleration.
• In rare cases, engine may run rich or lean as the PCM compensates for faulty readings.
• Noisy cooling system noises are less common but can occur if related cooling system faults are present.

DIAGNOSTIC STEPS

Note: Work safely. Ensure engine is cool before handling coolant components. If you’re not comfortable performing electrical tests, seek a professional.

Step 1: Confirm and review data

• Use a modern OBD-II scan tool to confirm P0116 is present and note any related codes (e.g., P0115, P0117, P0118).
• Check freeze-frame data for engine temperature, requested temp, fuel trim, RPM, and engine load at the time of fault.

Step 2: Visual inspection

• Inspect the ECT sensor and its connector for signs of corrosion, oil/fluids on the connector, damaged wiring insulation, or loose/mis-seated connectors.
• Inspect the coolant reservoir, hoses, clamps, and overall cooling system for leaks or damage.
• Check for signs of coolant contamination or improper coolant type.

Step 3: Test the ECT sensor and circuit

• Verify power, ground, and signal integrity:
  • With the ignition on (engine off), check that the ECT sensor connector has 5V reference from the PCM and a ground path when appropriate (consult service manual for exact wire colors in the Charger’s engine ECM).
  • With the engine running, monitor the ECT signal voltage (or resistance, depending on sensor type) using a reliable scan tool or multimeter. The signal should change smoothly with temperature; erratic or constant readings indicate sensor or wiring problems.
• Resistance/voltage test:
  • If you’re measuring resistance, test the sensor at known coolant temperatures (e.g., room temp, warmed to normal operating temp on a hot day). Compare to the sensor’s specifications for resistance vs temperature (dealer/service data will provide the exact curve for the Dodge ECT sensor).
  • If you’re measuring voltage, ensure the sensor is receiving the PCM’s reference voltage (commonly around 5V) and that the signal voltage increases or decreases in a reasonable range as the engine warms up.
• Wire continuity test:
  • Check for open or shorted circuit between the ECT sensor and PCM. Look for shorts to ground or +12V that could cause incorrect readings.
• Monitor live data:
  • Start the engine and watch ECT values as the engine warms from cold to normal operating temperature. The ECT reading should track the actual engine temperature; if it lags, hangs, or jumps out of range, focus on sensor and wiring first, then the PCM.

Step 4: Thermostat and cooling system check

• Confirm the thermostat is functioning properly (not stuck open or closed). A thermostat stuck open tends to make the engine run cooler and can cause the PCM to expect cooler temps than the actual; a stuck closed thermostat can cause overheating and abnormal readings.
• Check coolant level and condition; ensure coolant is the correct type for the vehicle.

Step 5: Look for related codes and conflicts

• If P0115 (ECT circuit/RANGE) or P0118 (Sensor High Input) is present, follow the diagnostic flow for those codes as well; they are often related.
• Confirm there are no ECM/PCM software issues or recalls affecting the cooling sensor readings (in this case, none reported in provided data).

Step 6: Make a repair decision

• If the ECT sensor readings are out of spec and wiring is solid, replace the ECT sensor.
• If wiring/connector is damaged, repair or replace the wiring harness and connector.
• If the thermostat or coolant system components are faulty, address those first and recheck codes.
• If all sensors and wiring test healthy but the code persists, consider PCM re-flash or replacement as a last resort (after confirming no intermittent sensor faults). This is less common and typically done under dealership/authorized service.

Step 7: Verification

• After repair, clear codes and run the vehicle through a normal driving cycle to ensure the P0116 does not return.
• Recheck live data to ensure ECT sensor readings now align with actual engine temperature.

RELATED CODES

• P0115: Engine Coolant Temperature Sensor Circuit Range/Performance (generic reference; check specifics for your model).
• P0117: Engine Coolant Temperature Sensor Circuit Low Input (indicates a low signal on the ECT circuit).
• P0118: Engine Coolant Temperature Sensor Circuit High Input (indicates a high signal on the ECT circuit).
• P0119 (less common in some systems): Engine Coolant Temperature Sensor Circuit High/Low Input anomalies or related sensor data interpretation.
  Note: In practice, you’ll often see P0116 alongside one of these related codes when the issue involves the sensor circuit or regulator readings.

REPAIR OPTIONS AND COSTS (2025 prices)

Prices vary by region, shop, and whether you need a simple sensor replacement or more extensive cooling-system work. Here are ballpark ranges for typical work on a 2021–2023 Dodge Charger.

• ECT sensor replacement
  • Parts: $15–$60
  • Labor: 0.3–1.0 hours (0.5 hr typical)
  • Total: roughly $60–$130 (local shop rates vary)
• ECT sensor wiring/connector repair
  • Parts: minimal (connectors, pigtails if needed) $5–$40
  • Labor: 1.0–2.5 hours
  • Total: roughly $120–$350
• Thermostat replacement (if needed)
  • Parts: $10–$40
  • Labor: 1.0–2.0 hours
  • Total: roughly $120–$300
• Coolant system service (flush, refill with the correct coolant)
  • Parts: $15–$40 (coolant)
  • Labor: 0.5–1.5 hours
  • Total: roughly $100–$180
• ECM/PCM service or reflash (rare, only if required)
  • Parts: typically $0–$100 (software/flash cost often handled by dealer)
  • Labor: 0.5–2.0 hours
  • Total: roughly $100–$400
• Total for combined fixes (sensor + wiring, etc.)
  • Typical overall range: $100–$500+, depending on what is found during diagnosis.

DIY vs PROFESSIONAL

• DIY suitability: Moderate. Replacing an ECT sensor is a common DIY task for someone with basic hand tools, a torque wrench, and a safe workspace. You’ll save on labor, but you must ensure you properly identify the correct sensor, avoid coolant spills, and properly reconnect wiring.
• When to call a professional: If wiring harness is damaged, if the diagnostic process requires precise voltage/ohm measurements, if you’re not comfortable handling the cooling system (risk of burns from hot coolant), or if you suspect ECM/PCM issues. A pro can also perform a proper reflash or calibration if needed.

Tips for DIY:

• Let the engine cool before starting.
• Disconnect the negative battery terminal before disconnecting electrical connectors to avoid shorts.
• Use the vehicle’s service manual for the exact ECT sensor location and torque specification.
• Replace with OEM or equivalent high-quality sensors; use the correct coolant type.
• After replacement, run the engine to operating temperature and check for leaks; re-check for codes.

PREVENTION

• Maintain coolant level and use the correct coolant type specified for the Charger. Regular cooling-system checks help prevent sensor anomalies due to overheating or improper mixture.
• Inspect the ECT sensor and wiring during routine maintenance or when you notice temperature gauge irregularities. Address damaged wiring or corroded connectors promptly.
• Keep the cooling system in good condition: replace the thermostat as recommended by maintenance intervals, ensure the radiator, hoses, and water pump are in good condition, and perform coolant flushes per the manufacturer’s schedule.
• Address coolant leaks immediately. Low coolant can cause temperature sensor readings to drift and trigger P0116.
• Monitor live data with a reliable scan tool. If readings begin to drift again after replacement, consider a PCM/ECU check or software update (via dealer if necessary).

Important data caveat

• The provided dataset shows no owner complaints and no recalls for the 2021–2023 Dodge Charger related to P0116. No recalls found in NHTSA database for this combination based on the given data. That means the guidance here emphasizes general diagnostic best practices and typical repair costs rather than model-wide recall or TSB guidance. If you have access to additional service bulletins or dealership advisories for your exact VIN, incorporate those steps as needed.