Category: P0481 buick

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p0481 buick

Details of the Circuit. What happens when DTC sets?

Error Code P0481: Cooling Fan 2 Control Circuit Malfunction

When will DTC clear? Diagnostic Tools. Task Done? Now Follow Step 2. Now Follow Step 3. Now Follow Step 5. Note: Here the value is 0. Does the amperage measure less than the specified value? Now Follow "Diagnostic Aids". Now Follow Step 4. Does the DVM display infinite resistance? Now Follow Step Now Follow Step 8. Now Follow Step 6.

With the test light connected to ground, inspect the ignition feed circuit in the relay harness connector. Now Follow Step 7. Now Follow Step 9. Check the connections at the relay. Do you see any problem? Test the connection at the ECM. Mend the faulty relay control circuit. Replace the faulty relay ignition feed circuit. Change the relay. Replace the ECM. Does the scan tool indicate that this diagnostic was run and passed?

Check if any additional DTCs are set. Do you notice any undiagnosed DTC being displayed?Play Now. Engine-Codes - Generic - P P Possible Causes What does this mean? How is the P code repair? Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P code Labor: 1. The auto repair labor rates vary widely across the country, and even within the same city.

How much do you know about cars? Take the AutoCodes. When is the code detected? The P code is detected when the Powertrain Control Module PCM detects that the commanded state of the driver and the actual state of the control circuit do not match. The cooling fan may be commanded ON when the engine is not running under a fan run-on conditions described in the electric cooling fan general description portion of the service manual.

More Information Need more information on how to fix the P code? Get Access to Factory Service Manuals. Need more help? Get the P code diagnosed by a professional: Find a repair shop in your area. Why is the Engine Light ON? Repair Importance Level: 3.Welcome to the Buick Check Engine Light codes page. Below you will find the most complete list of Buick trouble codes available. The code definitions are a good starting point when determining the cause of the service engine light but where do you go from there?

We have a large number of resources to help you repair the problem. Here is how we suggest you proceed. Look up your code definition.

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This tells you where to start testing. If you are unsure of any abbreviations, check out the acronym list by clicking on the link at the left. Next, read our article Automotive Circuit Testingand if there is an article related to the system you are testing, such as Oxygen Sensors or EGR concerns, read these as well.

They will provide valuable info! If there is a link to a specific diagnosis strategy for the code then follow that and start testing. If there is no procedure for your manufacturer specific code, then I suggest referring to a similar generic OBD II code these are listed numerically by system type to get a good idea of what to look for. If at this point you still need assistance use the "Get Help" link and let us know how we can help.

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We do ask that you please read the info available on the site first so that we can help reduce repeat questions.

So please read our Disclaimer and when you're ready jump in! Be sure to scroll all the way to the bottom of the page as there is some great info there! Also we value your feedback and like to hear stories of unusual fixes or concerns you may have run into with your Check Engine Light, so feel free to share your experiences by using the "Contact Us" link.

Let's go! We do our best to update these Buick Check Engine Light codes as frequently as possible. If you find one missing let us know and we we'll add it immediately! Please use the form on our Contact Page to get in touch with us. We certainly understand how frustrating it can be to look for a code definition and have it not online when you need it. And lets face it, if the service engine light is on then you need it now! It's easiest to use the "Find On This Page" feature of your browser's "Edit" menu to find codes on this page as the list is quite long.

These are listed in numerical order for easy searching.Your Buick Terraza engine control system detects a problem, the computer stores the diagnostic trouble code P in its memory. To solve P Buick Terraza problem, you'll have to remove the muffler, crankcase and other components blocking the valve chamber. Then, remove the cylinder head bolts label for easy re-installation Adjust the jaws of the valve spring compressor until they touch the top and bottom of the valve chamber Push the tool in to compress the spring and tighten the jaws Remove the retainers and lift out the valvescompressors and springs.

OBD P Buick Terraza code and tailpipe testing are two different approaches to identify vehicles in need of repair.

The OBD system looks for broken or malfunctioning emissions control components and P, while tailpipe tests sample a vehicle's exhaust to see if it is above or below certain prescribed limits. Given the robust nature of today's emissions control components, it is entirely possible for an individual component to P DTC For Buick Terraza malfunction without leading to an immediate increase in emissions at the tailpipe.

In such cases, other components like the catalyst can temporarily compensate for the part that is broken however, these other components can only do double duty for so long before they, too, begin to malfunction. Most state and local areas also include a gas cap pressure test as part of an emission inspection.The engine cooling fan system consists of a cooling fan assembly containing two electric cooling fans.

The engine control module ECM uses two fan control circuits and a series of three relays to command the fans ON in either high speed or low speed, depending on cooling requirements. The ECM activates the applicable relay by grounding the control circuit with a solid state device called a driver. Each driver is equipped with a feedback circuit that is pulled-up to a voltage.

The ECM can determine if the control circuit is open, shorted to ground or shorted to a voltage by monitoring the feedback voltage. In low speed, both fans are turned ON at a reduced speed.

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High speed has both fans turned ON at full speed. The commanded state of the ECM driver and the actual state of the control circuit do not match for greater than 5 seconds. Verify an audible click is heard or felt from cooling fan relays 1, 2 and 3 when commanding the cooling fans ON and OFF with a scan tool.

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Verify that a test lamp illuminates between ground and a relay coil ignition circuit terminal listed below:. NOTE: The following tests must be performed on all three fan relay circuits.

Connect a DMM, set on the diode setting, between ground and a relay control circuit terminal listed below:. Verify the DMM reading is greater than 2. L with the cooling fan relays commanded OFF with a scan tool. NOTE: This test only applies to the speed control relay. The engine control module ECM uses the engine coolant temperature sensor to monitor the engine for an over-temperature condition. This condition occurs when the coolant temperature is above a calibrated value.

By switching between the 2 groups of cylinders, the ECM is able to reduce the temperature of the coolant. Review the entire cooling system operation in order to familiarize yourself with the system functions. Using this kit will prevent damage caused by the improper probing of connector terminals.

Several of the symptom procedures call for a careful visual and physical inspection. This can lead to correcting a condition without further tests and can save time. This inspection should include the following:. Many intermittent conditions occur with harness or connector movement due to engine torque, rough pavement, vibration or physical movement of a component. Refer to the following for a list to help isolate an intermittent condition:.

If an intermittent fault is detected, refer to Testing for Intermittent Conditions and Poor Connections for specific strategies in diagnosing intermittent conditions.

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:. NOTE: The following tests must be performed on both fan relay circuits. It may take up to 2 minutes for all vehicle systems to power down. The coolant thermostat can be tested using a temperature tempil stick.

The temperature stick is a pencil-like device which has a wax material containing certain chemicals that melt at a given temperature. Use a tempilstick in order to find the opening and the closing temperatures of the thermostat. The coolant heater operates using V AC external power and is designed to warm the coolant in the engine block area for improved starting in very cold weather. The coolant heater also helps reduce fuel consumption when a cold engine is warming up. The unit is equipped with a detachable AC power cord.

A weather shield on the cord is provided to protect the plug when not in use.This trouble code refers to the engine cooling fan circuit, as it experiences a malfunction causing the fan to fail, which then leads to engine to overheat. This code is a generic trouble code, which means it applies to all vehicles equipped with OBD-II scanner, or vehicles made since up to present.

As the vehicle runs, the radiator and the engine are both being cooled by the air with sufficient quality as it passes through.

p0481 buick

When the vehicle idles or stops, there will be no air to pass through the radiator. This is where the purpose of the fans kicks in — to provide ample cooling for both the radiator and engine to keep them from overheating.

The PCM powertrain control module, also known as ECM or engine control module in other vehicle makes senses this increase in temperature through the CTS coolant temperature sensor located near the thermostat. Should there any problem within the circuit that will cause the fan to fail, the engine will heat up, causing it to overheat. This can happen whether the vehicle is sitting still or driving at slow speed. Basically, the Error Code Pmeans the cooling fan 2 control circuit has experienced a problem, causing it to malfunction.

Error Code P refers to the basic circuit, and its related codes Error Code P and Error Code Prelates to similar problem, but specific to different fan speed relays. As with other error codes, this code triggers the Check Engine light. Aside from that, the only obvious symptom for this code is the increase of engine temperature each time the vehicle comes to stop or idles, this is because the fans are not running to cool off the engine.

There are multiple factors that can lead to this error code, some of the most common possible causes are:.

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To diagnose this error code, mechanics use a scan tool to check for any codes present in the PCM. Next, they clear the codes and then take the vehicle for a test drive to duplicate the conditions when the code was set. Then, they use the scan tool to check the datastream and confirm the VSS sensor has proper readings, and if the coolant temperature sensor is reading accurately. Then they test the fan control relay using a relay tested, or switch the relay using a good relay to test.

Repairs for this error code are pretty simple and straightforward, which of course, can be derived from a thorough diagnosis. Some of the usual repairs are:. The most common mistake people commit when dealing with this error code is skipping steps from the diagnosis.

There are many systems involved in this error code, which is why it is crucial to pinpoint which component is causing the problem.

P0481 DTC For Buick Terraza

Remember me. Table of Contents. Subscribe to our mailing list.This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection.

p0481 buick

The P code identifies a problem with the control circuit for cooling fan 2. It is often associated with the P code. The cooling fan should be commanded on under certain conditions where the engine requires more cooling, and this is controlled via the cooling fan relay. If this does not take place, the Check Engine light will illuminate on the dashboard. Other than illuminating the Check Engine light on the dashboard, the P code may cause the engine to overheat as a symptom.

This is because the cooling fan, meant to help regulate the coolant temperature, did not function properly when commanded on by the ECM engine control module.

A qualified technician will use a scanner that is capable of scanning the factory sensor readings more advanced than one from the auto parts store to read the code. The code will then be reset. The technician will then observe data on the scanner while driving. If the same code comes back, then both cooling fan 2 and the associated relay will be inspected for damage or a short in the wiring.

If the code does not come back, then the technician will perform further testing to diagnose the issue. Often when the P code is observed, it is immediately assumed that either the cooling fan itself needs to be replaced or the cooling fan relay is faulty.

There are a number of sensors the ECM engine control module uses to control the cooling fan relay. These include:.

DTC P0481-High Speed Cooling Fan Relay Circuit fault

These components should be inspected along with with the cooling fan relay and wiring to ensure that the issue is taken care of without needlessly replacing parts. The P code will not prevent the vehicle from starting and driving, but all the same it can be a serious issue. In conditions where the engine is experiencing excess heat, serious damage could occur if the cooling system cannot work properly.

Overheating in the engine can damage a number of crucial components and lead to very expensive repairs. When there is a trouble code present that can be set off by a sensor in the drivetrain, there are a number of possible causes. Sometimes small electrical issues or malfunctions can falsely set off codes, so the first step in diagnosis is always to reset the code and see if it activates again when the vehicle is running.

Sometimes the code occurs constantly as soon as the engine is turned on. Simple things like a bad wire or corrosion around the connectors can cause trouble codes to appear.

This is why it is crucial to have a qualified technician perform a diagnosis before any parts are replaced. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at Our certified mobile mechanics perform over services, including diagnostics, brakes, oil changes, scheduled mileage maintenances, and will come to you with all necessary parts and tools.