How To Reset The P0128 Code On Your Jeep Wrangler (2024)

If your Jeep Wrangler is displaying a p0128 code, it means that the engine is not reaching the correct operating temperature. This can be caused by a variety of issues, but the most common cause is a coolant leak. Once you have located the leak and repaired it, you will need to reset the code. The following guide will show you how to reset the p0128 code on your Jeep Wrangler.

Most Jeeps come with P0128, which is usually caused by an open coolant thermostat. When this happens, hot coolant should begin to flow, and the radiator hose should be quickly warmed up. This problem code can also be found on the intake air temperature sensor, coolant temperature sensor, and coolant fan. If the P0128 code is not met, the engine coolant is not getting warm sufficiently fast. A faulty thermostat, low coolant levels, or other issues can all be the source of the code. A coolant temperature sensor is used in a cooling system to measure the coolant/antifreeze mix temperature. It is estimated that the cost of replacing a Jeep Wrangler Thermostat will range between $68 and $86.

Will P0128 Code Clear Itself?

The P0128 permanent code will remain in the system until it has completed so many cycles that it has not detected the low coolant temperature.

If the engine is not starting, a faulty coolant temperature sensor could be to blame. Failure to regulate the engine or an overheated thermostat are two other possible causes of the problem if the engine does not overheat. You’ll need to bring your car in for service in either case. If this code indicates that the engine is not overheating, it is possible that the thermostat needs to be replaced. The engine overheating is most likely caused by the coolant pump or thermostat.

Can You Drive With A P0128 Code?

Is it safe to drive with P0128? Despite the code’s illumination, your vehicle will still drive even after you plug it in. As a result, the vehicle will not be hampered or stopped abruptly. If the temperature gauge does not reach the desired level, it is the only thing that will cause trouble.

P0128 indicates that your coolant thermostat is operating below the temperature set by your fix sensor. A P0128 code can be triggered by a faulty wiring or an engine that is not responding quickly enough. There is no coolant, and the temperature remains constant even though there is no coolant. The temperature can quickly rise in an overheated vehicle if there is no radiator fan. The first step in troubleshooting P0128 is to examine the engine’s thermostat. Temperatures should range between 160 and 200F in general. If there is no sudden heat up on the radiator hose’s exterior, it may be possible to argue in this case.

Before scanning your vehicle, you should double-check whether P0128 is already present or not. It is best to first check the coolant system in order to resolve any issues. The coolant in question contains a lot of rust, so the rust must be removed as soon as possible. If you notice a change in voltage, keep an eye on the voltage reading. If the thermostat has become stuck open, there is a problem. Examine the coolant system in order to ensure it is operational. If you overheat the engine, it will degrade over time. How long can you drive a car with a P0128? It is not recommended to drive for more than 1000 miles.

What Does The Code P0128 Mean On A Jeep Wrangler?

P0128 can be caused by a stuck coolant thermostat, which is one of the most common causes. Feel the radiator hose to determine how hot the coolant is when it begins flowing through it, and then monitor the temperature of the coolant as it enters the radiator hose.

If you have a Jeep P0128 code, you must first diagnose the problem. Engine temperatures can be calculated and analyzed using the live data functionality of the FIXD sensor and app. RepairPal-certified shops have a minimum 12-month warranty on all repairs lasting 12,000 miles or more. It is possible that some repairs will be required to fix or diagnose the underlying issue of Jeep P0128. A repair’s cost will be determined by the cost of the necessary parts and labor. If you want to make your own diagnosis and repair, follow these steps. The most common cause of P0128 is an open coolant thermostat in an engine. It is a simple way to diagnose this by gently touching the radiator hose and measuring how hot it feels when the coolant starts flowing through it. A loose fitting connector or a low and dirty coolant are common causes.

Reset Check Engine Light Jeep Wrangler

If your Jeep Wrangler’s check engine light is on, you can try resetting it by disconnecting the battery for 30 seconds. If the light comes back on after reconnecting the battery, then you’ll need to take your Wrangler to a mechanic to have it diagnosed and repaired.

A Check Engine Light (CEL) is a warning mechanism that kicks in when a system error is detected. When the CEL comes up, it is most likely unrelated to the engine. Furthermore, it can be indicative of a problem with the transmission, emissions control mechanism, or ignition system. It is most common for experts to use an OBDII scanner during this procedure. If the smell in the engine bay is strong, it is a strong indication that the gas is needed. In some cases, you can simply keep driving until the light goes out on its own. Even so, I would still recommend clearing the codes.

Don’t Try To Fix Your Jeep’s Check Engine Light Yourself

Attempting to fix your Jeep’s check engine light on your own can result in serious engine damage. Instead, call our team to schedule service right away. We will be able to look at your car and determine whether there are any underlying issues, as well as possibly fix them.

How To Reset The P0128 Code On Your Jeep Wrangler (2024)

FAQs

How long does it take for P0128 to clear? ›

This permanent code will go away on its own after the monitor runs and passes. Until then it will be present but only when read with a scan tool and will not turn the light on.

How do you clear the engine code on a Jeep Wrangler? ›

Resetting a Jeep Check Engine Light is Easy

Ensure your vehicle is off and open the hood. Locate the battery and find the negative terminal. Disconnect the negative terminal connector and keep it away from the terminal for about 30 to 60 seconds. Reconnect the negative terminal cable and tighten everything back up.

Is P0128 a thermostat or sensor? ›

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.

Why does my P0128 code keep coming back? ›

The most likely cause is a leaking or stuck open thermostat. Related issues would typically signal another error code, so this should be one of the first areas to inspect.

Can I drive a Jeep 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.

Will the P0128 code clear itself? ›

After the vehicle sits for a period of time, usually 6-8 hours ("cold soak") the code should clear itself. If the code does not clear itself after restarting the engine, then the low coolant was not the problem and the thermostat and coolant temp sensor will need to be looked into.

How long does it take for a thermostat to reset? ›

Non-Programmable Digital Thermostat

Hold the reset button down for 5 seconds and the thermostat should reset. Another option is just taking out the batteries for 5 seconds which should also reset the thermostat.

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.

How do you manually reset engine codes? ›

The on-off method is the equivalent fix for a vehicle's check engine light. It forces the computer to refresh its saved state through a reboot. Simply place your key into the ignition and turn it on for 1-2 seconds, then turn it off for 1-2 seconds. Repeat this step three or four times.

How to reset a Jeep Wrangler computer? ›

Using a wrench or socket that fits, carefully disconnect the negative terminal from the battery. This step is important as it allows the system to reset completely. Leave the terminal unplugged for approximately 5-10 minutes to ensure that all residual power is drained from the system.

Will the Jeep check engine light reset itself? ›

Will the check engine light reset itself? The check engine light on your Jeep Cherokee will normally shut itself off if the issue or code that caused it to turn on is fixed. For instance, if the cause of your check engine light coming on was a loose gas cap, if it's tightened, the light will swiftly turn itself off.

How much does it cost to replace a Jeep thermostat? ›

Labor costs are estimated between $72 and $90 while parts are typically priced around $312.

How do you reset a stuck thermostat? ›

Find the breaker to your HVAC system, flipping it 'off'. Make sure the breaker is flipped all the way 'off,' then wait for 30-seconds. Turn the breaker back 'on. ' Return to the thermostat control panel and flip the thermostat back into the 'on' position.

How do you remove a coolant temperature sensor? ›

Coolant sensors are installed like spark plugs, which means they need to be carefully unscrewed in a counterclockwise direction using a deep socket and ratchet. It's advisable to clean the sensor's connector before plugging it in. The connector should snap onto the sensor, ensuring a good connection.

How much does it cost to fix a P0128 code? ›

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.

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