What is the code P0128 on a 2013 Toyota Sienna?

The code P0128 on a 2013 Toyota Sienna indicates a problem with the coolant thermostat. The code means that the engine coolant temperature is below the thermostat regulating temperature. This can cause symptoms such as the check engine light being on, higher than normal idle, decreased fuel economy, and the temperature gauge showing unusually low readings.
To properly diagnose and fix the issue, it is recommended to get the code properly diagnosed by using a diagnostic tool that can read and analyze engine temperatures. This will help determine the exact cause of the malfunction in the coolant temperature circuit. If you’re not comfortable diagnosing the issue at home, it is advisable to find a reputable auto repair shop that can pinpoint the problem and provide an accurate estimate for repairs. RepairPal-certified shops are recommended as they offer a minimum 12-month, 12,000-mile warranty and guaranteed fair pricing.
The cost to fix the P0128 code can vary depending on factors such as the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour for diagnosis and repairs.
It’s important to address the P0128 code as soon as possible to prevent any further issues with the engine’s cooling system.

How to fix coolant temperature below thermostat regulating temperature?

If the level is under the minimum requirement, add more coolant so the level comes up to the maximum level. Take the car for a short drive and see if the same P0128 fault code comes up. If topping off the coolant doesn’t help, the thermostat should be the next thing to replace.

How do I know if my coolant temp sensor is bad?

4 Signs Your Coolant Temperature Sensor is Faulty

1. Faulty Coolant Temperature Sensor – 4 Common Symptoms.
2. Fuel Consumption Increases.
3. Check Engine Light Flashes.
4. Engine Overheating.
5. Black Smoke from the Exhaust.
6. Don’t Ignore the Warning Signs.
7. Reliable Car Maintenance with Professional Auto Experts!

How much does it cost to fix P0128?

Estimated Cost of Repair for the P0128 Code
Depending on the root cause of the issue, the costs of fixing the code P0128 will most likely range from $150-$250.

Where is the thermostat sensor located?

The AC sensor on your thermostat is located near the evaporator coils. Indoor air moving toward the return vents passes by the sensor and coils. In turn, the sensor reads the temperature and checks if it matches what you’ve set on the thermostat.

How do I fix my P0128 engine code?

How do I fix my Chevy P0128 code?

1. Check the coolant level: If the level is lower than the minimum, add more coolant and go for a short drive.
2. Inspect the coolant temperature sensor: The primary coolant temperature sensor is in the cylinder head near the thermostat.

What happens when a coolant temperature sensor goes bad?

If your coolant sensor went bad so it can’t read temp properly such as it thinks the engine is colder than it actually is. The sensor sends it’s info to the ECU which processes this info and adjusts the fuel injector to deliver fuel to a “COLD” engine even though the engine is actually warm.

Is P0128 a thermostat or sensor?

While there is a small chance that there is an issue with the running temperature of your engine, by far the most common issue with trouble code P0128 is a faulty thermostat. The exact location of the thermostat and issues related to a damaged thermostat may vary depending on your vehicle.

Is code P0128 serious?

Error code P0128 simply means the coolant temperature is below the ability of the thermostat to regulate. This code may not alert you to the exact nature of the problem, however, it can be an indication of several issues you should check out as soon as possible.

How do you reset a coolant temperature sensor?

Coolant temperature sensors are resistors and can’t be reset. The engine control unit is the part that actually runs software and just takes information from the sensor. If you think you have a problem with your sensor, test its resistance by attaching it to a multimeter and submerging the sensor in hot water.

Can I still drive my car with a P0128 code?

How Long Can You Drive with a P0128 Code? Although it may be possible to drive short distances with code P0128 set, you should get the issue fixed by a professional right away. Doing so will help ensure your vehicle keeps running at its best while also helping to prevent any additional damage.