How to Replace the 2016 Chevy Cruze Coolant Temperature Sensor

If your 2016 Chevy Cruze is overheating, showing a check engine light with code P0117 or P0118, or experiencing poor fuel economy, the coolant temperature sensor may be failing. This small but critical component monitors engine coolant temperature and sends data to the ECU to regulate fuel mixture, ignition timing, and cooling fans. For the 2016 model year, the primary engine coolant temperature (ECT) sensor is located on the engine block near the thermostat housing, while a secondary radiator coolant temperature (RCT) sensor is mounted on the passenger side of the radiator. Understanding how to diagnose and replace the 2016 Chevy Cruze temp sensor can save time, prevent engine damage, and avoid unnecessary repairs.

Why the Coolant Temperature Sensor Matters in Your 2016 Chevy Cruze

The engine coolant temperature sensor plays a vital role in maintaining optimal engine performance and emissions control. In the 1.4L turbocharged inline-4 engine used in most 2016 Cruze models, the ECT sensor is a thermistor that changes resistance based on coolant temperature. When cold, resistance is high; as the engine warms up, resistance drops, signaling the powertrain control module (PCM) to adjust operations accordingly.

A malfunctioning sensor can send incorrect data—such as indicating the engine is always cold—which leads the PCM to enrich the fuel mixture unnecessarily. This results in increased fuel consumption, higher emissions, and difficulty starting when warm. Conversely, if the sensor reads too hot, the system may trigger false overheating warnings or activate cooling fans continuously, draining battery power.

Symptoms of a Failing Coolant Temperature Sensor in a 2016 Chevy Cruze

Recognizing early warning signs helps prevent long-term engine issues. Common symptoms include:

• Check Engine Light (CEL): Often accompanied by diagnostic trouble codes (DTCs) like P0115, P0117, or P0118, which relate to circuit range/performance or voltage issues.
• Inaccurate Temperature Gauge Readings: The dashboard gauge may show normal temps even when the engine is overheating—or remain at cold for extended periods after startup.
• Poor Fuel Economy: A faulty sensor stuck in 'cold mode' causes over-fueling, reducing MPG significantly.
• Black Smoke from Exhaust: Excess fuel not fully combusted exits as sooty emissions.
• Difficulty Starting When Warm: If the sensor fails to report rising temperatures, the PCM won’t adjust the air-fuel ratio properly during restarts.
• Cooling Fans Run Constantly: Especially true if the RCT sensor fails shorted, telling the PCM the radiator is too hot.

These issues are often mistaken for thermostat problems or water pump failures, leading to misdiagnosis. Before replacing other components, verify the temp sensor’s operation using an OBD2 scanner or multimeter.

Where Is the Coolant Temperature Sensor Located on a 2016 Chevy Cruze?

🔍 There are two key sensors involved:

1. Engine Coolant Temperature (ECT) Sensor: Mounted on the lower left side of the cylinder head, near the thermostat outlet and close to the front of the engine. It threads directly into the coolant passage.
2. Radiator Coolant Temperature (RCT) Sensor: Found on the passenger-side radiator tank. This sensor controls fan activation independently of the engine sensor.

To access the ECT sensor: 📍 Open the hood and locate the throttle body on the driver’s side. 🛠️ Remove the plastic engine cover if equipped. 🔍 Look down toward the base of the engine, just behind the serpentine belt area—you should see a two-wire electrical connector leading to a cylindrical metal sensor screwed into the block.

The RCT sensor is easier to reach: simply follow the upper radiator hose to the passenger-side tank. It has a single-wire connector clipped to a small protruding unit.

Sensor Type	Location	Part Number (OEM)	Function
Engine Coolant Temp (ECT)	Driver-side engine block, near thermostat	55591401	Fuel/ignition control, CEL triggering
Radiator Coolant Temp (RCT)	Passenger-side radiator tank	55591002	Fan control, overheating detection

How to Test the Coolant Temperature Sensor

Before replacing any part, confirm the issue lies with the sensor. You’ll need a digital multimeter and possibly an OBD2 scan tool.

Step-by-Step Testing Procedure ⚙️

1. Scan for Codes: Use an OBD2 reader to pull stored codes. P0117 (low input) or P0118 (high input) suggest sensor circuit issues.
2. Monitor Live Data: With the engine off, turn the key to “ON” without starting. Check live data for coolant temperature. It should match ambient air temp. Start the engine and observe if readings rise steadily.
3. Measure Resistance: Disconnect the sensor’s wiring harness. Set your multimeter to measure resistance (ohms). Probe the two terminals on the sensor.
   • At room temperature (~70°F / 21°C), expect around 2,000–3,000 ohms.
   • When hot (~200°F / 93°C), resistance should drop to ~200–400 ohms.
   If readings are out of range or inconsistent, the sensor is faulty.
4. Check Voltage Signal: Reconnect the harness and back-probe the signal wire while monitoring with a voltmeter. Voltage should decrease from about 4V (cold) to 1V (hot).

If resistance doesn’t change predictably with temperature, replacement is necessary.

How to Replace the 2016 Chevy Cruze Coolant Temperature Sensor

🔧 Replacing the ECT sensor is a moderate DIY job requiring basic tools and coolant handling precautions.

Tools & Materials Needed

• New coolant temperature sensor (OEM or compatible)
• Socket set and ratchet (usually 19mm socket)
• Drip pan
• Coolant (DEX-COOL or equivalent, GM-approved)
• Gloves and safety glasses
• Torque wrench (recommended)

Replacement Steps

1. Let the Engine Cool Down: Never open the cooling system when hot to avoid burns.
2. Drain Coolant Slightly: Place a drip pan under the radiator drain plug or lower hose. Open the valve and drain enough fluid so the level is below the sensor (about 1–2 quarts).
3. Disconnect Electrical Connector: Press the release tab and unplug the harness from the sensor.
4. Remove the Old Sensor: Use a socket to loosen and remove the sensor. Be careful not to break it off in the block.
5. Prepare the New Sensor: Apply a thin coat of anti-seize compound to the threads (optional but recommended to prevent corrosion).
6. Install the New Sensor: Thread it in by hand first to avoid cross-threading, then tighten to manufacturer specification—typically 10–15 ft-lbs.
7. Refill Coolant: Close the drain, refill with proper coolant mix (50/50 distilled water and antifreeze), and bleed air from the system by running the engine with the radiator cap off until flow stabilizes.
8. Clear Codes and Test Drive: Use an OBD2 scanner to clear any stored codes. Monitor temperature readings during a test drive.

⏱️ Total time: Approximately 45 minutes to 1 hour.

Choosing the Right Replacement Sensor

🛒 Not all aftermarket sensors perform equally. While OEM ACDelco units (like part #55591401) offer reliable calibration and durability, reputable brands such as Standard Motor Products (TX229), Denso, or Delphi also meet OE specifications.

When selecting a replacement:

• Verify Fitment: Ensure compatibility with 2016 Chevy Cruze 1.4L turbo (VIN L) or 1.8L naturally aspirated (VIN V).
• Check Connector Style: Must have a two-pin connector matching the original.
• Avoid Extremely Cheap Options: Sensors under $10 often use inferior materials and fail prematurely.
• Look for Warranty: At least 1-year warranty indicates confidence in longevity.

Some online listings incorrectly list sensors for earlier models (2011–2015) as compatible with 2016, but minor revisions exist. Always double-check part numbers before purchase.

Common Misconceptions About the 2016 Chevy Cruze Temp Sensor

❗ Several myths persist among owners and even some mechanics:

• Myth: One Sensor Controls Everything: False. The ECT and RCT serve separate functions. Replacing only one may not resolve all symptoms.
• Myth: Any Temperature Sensor Will Work: No. Calibration curves vary between manufacturers. Mismatched sensors can cause inaccurate readings.
• Myth: You Must Replace the Thermostat Too: Unless it’s sticking or leaking, there's no mechanical link requiring simultaneous replacement.
• Myth: Air Bleeding Isn't Necessary: Trapped air creates hot spots and false low-coolant signals. Always burp the system after refilling.

Can You Drive With a Bad Coolant Temperature Sensor?

⚡ Short-term driving is possible, but not advisable. The engine will run in 'limp mode' or with incorrect fuel mapping, increasing wear and emissions. Long-term operation risks overheating (if the PCM doesn’t activate fans) or catalytic converter damage due to unburned fuel.

If you must drive temporarily:

• Monitor engine temperature closely via dashboard gauge.
• Avoid heavy loads or highway speeds.
• Inspect coolant levels daily.
• Get the sensor replaced within a few days.

Cost Considerations: OEM vs Aftermarket

💰 Based on current market data (excluding retail platforms like Walmart or Amazon per guidelines), typical price ranges are:

• OEM ACDelco (55591401): $25–$35
• Standard Motor Products TX229: $20–$28
• Budget Aftermarket: $8–$15 (higher failure rate reported)

Labor at a repair shop typically costs $80–$120, making DIY replacement a cost-effective solution.

Preventive Maintenance Tips

✨ To extend sensor life and avoid premature failure:

• Use only GM-approved DEX-COOL or equivalent coolant.
• Flush the cooling system every 5 years or 100,000 miles.
• Avoid mixing coolant types, which can cause sludge and corrosion.
• Inspect connectors periodically for moisture or corrosion.

Regular maintenance reduces thermal stress on sensors and prevents false readings caused by degraded coolant conductivity.

Frequently Asked Questions

Where is the coolant temperature sensor on a 2016 Chevy Cruze?

The main engine coolant temperature sensor is located on the driver-side engine block near the thermostat housing. A second radiator-mounted sensor is on the passenger-side radiator tank.

What happens when a temperature sensor goes bad on a Chevy Cruze?

A failed sensor can cause poor fuel economy, black exhaust smoke, hard starts when warm, constant cooling fan operation, and incorrect temperature gauge readings. It may also trigger the check engine light with codes P0117 or P0118.

How much does it cost to replace a coolant temperature sensor on a 2016 Chevy Cruze?

Parts typically range from $15 to $35. With labor, total cost averages $100–$150. Doing it yourself cuts costs significantly.

Can I replace the coolant temperature sensor myself?

Yes, it’s a manageable DIY task requiring basic tools and coolant handling knowledge. Allow about an hour and ensure the engine is cool before starting.

Are there two temperature sensors in the 2016 Chevy Cruze?

Yes. The engine coolant temperature (ECT) sensor monitors internal engine temp for fuel management, while the radiator coolant temperature (RCT) sensor controls fan operation. Both can fail independently.