P0266 fault code

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 diagnostic. P is an OBD-II diagnostic trouble code which indicates that the engine control module ECM detected the cylinder number 3 having low contribution to the running of the engine; low power. The crankshaft sensor sees no crankshaft acceleration for the number 3 cylinder when it is supposed to fire.

The compression in number 3 cylinder is low due to rockers, lifters, cam, rings or cylinder head gasket problems. The injector O-ring seals are leaking compression around them. This would have compression blowing out around the injector. The check engine light will be illuminated and the code P is set in ECM memory and freeze frame.

The engine will run rough and low on power.

P0263 OBD-II Trouble Code: Cylinder Number 1 Contribution/Balance Fault

The exhaust may blow black smoke. The engine will have a misfirecausing a buck or jerk and a rough idle. The engine may lack some power during acceleration if the misfire is active.

The engine may stall or have other drivability symptoms related to a misfiring or weak cylinder. A misfiring cylinder can cause the engine to run lean on the failed cylinder if it is an injector or fuel pressure and volume related problem.

The engine may blow black smoke if it has low compression in the cylinder and the injector is still pumping in the fuel to the cylinder.

Repairing the engine for low compression in the cylinder if the compression in the cylinder is below specifications when compared to the other cylinders. Code P is triggered when the crankshaft sensor does not get an acceleration of the crankshaft from cylinder number 3 power stroke, which indicates that the cylinder is not contributing to engine power. The lack of cylinder acceleration is interpreted by the ECM as a cylinder misfire in a diesel engine.

The code is used in mostly diesel engines. YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle.The ECM detects sensor circuit voltage that is outside of the specified range designed for the sensor over a specified amount of time. Does a visual check of the wiring and connections to the throttle body sensors to see if they are secure.

Checks scan data to see if sensor voltage is open or shorted, and follows pinpoint testing steps to find short or open circuit.

p0266 fault code

Do a visual check of connections to the sensor to make sure they are making good contact to the throttle control assembly.

Repairing or replacing defective connectors or wiring to the sensor if they are corroded, or have connector damage. Replacing or reprogramming the ECM.

The code P is for one of the multiple sensors for the throttle body control. Some vehicles use the sensor to compare voltage output with the redundant sensors to prevent throttle control issues. This code may have various drive symptoms, depending on the manufacturer's failure limp home mode. 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 The most popular service booked by readers of this article is Brake Pad Replacement.

Our certified mobile mechanics make house calls in over 2, U. Fast, free online quotes for your car repair. Schedule Brake Pad Replacement. Service Area. Average rating from 11, customers who received a Brake Pads Replacement. What causes the P code? The ECM detects sensor circuit voltage that is outside of the specified range designed for the sensor over a specified amount of time Short to the supply voltage in the signal cable Short to ground in the signal cable Open circuit in the signal cable What are the symptoms of the P code?

The sensor is ignored during braking and the throttle is shut completely during stops The throttle sets to a fixed position during failure Low idle position resulting in uneven idle or jerking during braking Very poor throttle response, or no response at all, during acceleration Disabled cruise control Vehicle speed limited to approximately 32 mph or less Check Engine Light and Electronic Throttle Control ETC Light illumination How does a mechanic diagnose the P code?

Scans codes and documents the freeze frame data Clears the engine and ETC codes to verify whether the concern comes back Does a visual check of the wiring and connections to the throttle body sensors to see if they are secure Disconnects connection to the sensors and checks for corrosion, or problems with pin engagement Checks scan data to see if sensor voltage is open or shorted, and follows pinpoint testing steps to find short or open circuit Tests the sensor resistance and compares it to specifications Common mistakes when diagnosing the P code Follow these simple guidelines to prevent misdiagnosis Do a visual check of connections to the sensor to make sure they are making good contact to the throttle control assembly Make sure the battery and charging system is working properly Look for any problems with burnt or cut wiring to the sensor, or corrosion in the connections How serious is the P code?

The engine will go into limp home mode and systems will be limited The vehicle speed will be limited to less than 35 mph The engine may hesitate or lack acceleration The engine idle will be low and erratic, or may be fixed to a set RPM What repairs can fix the P code?

Repairing or replacing defective connectors or wiring to the sensor if they are corroded, or have connector damage Repairing cuts or shorts in the wiring to the sensor Replacing the throttle body control assembly, if defective Replacing or reprogramming the ECM Additional comments for consideration regarding the P code The code P is for one of the multiple sensors for the throttle body control. Home Articles. The statements expressed above are only for informational purposes and should be independently verified.

Please see our terms of service for more details. Related Articles. Related Questions. I just got the car two days ago and the engine light is on Hey there, thanks for writing in about your Cadillac CTS. The light coming on may mean that they just cleared the code and light before selling you the car, or your light is on from a loose gas cap Overheating with squealing This can be caused by a number of things such as low coolant levels, a faulty thermostat, a failing water pump or a failing coolant fan switch.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 diagnostic. This diagnostic trouble code indicates that the powertrain control module has detected that the reference voltage from the fuel injector on cylinder 2 has fallen out of the range of acceptance set by the vehicle manufacturer. Damaged wiring or connectors associated with the fuel injector circuit on the number 2 cylinder may be present.

A mechanic may begin diagnosing this trouble code by removing any engine covers that exist to gain access to the fuel injectors. Once the fuel injectors are visible, the mechanic would inspect the wiring and connectors for damages that may have been caused by mice or other small animals that could have nested under the engine cover. If the cause of the issue has still not been revealed after these two tests have been performed, the mechanic would use a high tech scan tool to test the powertrain control module to ensure that it is working correctly.

A common mistake that could be made when diagnosing this trouble code would be to replace the fuel injector on the number 2 cylinder when it is actually the wiring or connector that is faulty.

It is very important to check all possible causes of a problem before making a repair decision. This code would be considered serious because the engine will not run properly with the cylinder 2 injector not functioning as it should. This issue would be worse on 4 cylinder and 6 cylinder engines as opposed to 8 cylinder engines due to the fact that the extra cylinders can make up for the imbalance that the malfunctioning injector on cylinder 2 would cause.

A code such as this should be diagnosed and repaired as soon as possible because continuous driving with a misfire condition can cause damage to the engine. Repairing or replacing the wiring or connector that is associated with the fuel injector on the number 2 cylinder.

Running a good fuel system cleaning through your engine to clear any restrictions the fuel injector on the number 2 cylinder may have. This code will likely be associated with a P code for a cylinder 2 misfire.

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 With YourMechanic you can skip the auto shop altogether. They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance.

Cost of diagnosing the P code. No more waiting rooms! Our mechanics will come to you to diagnose and fix the P code. Recent Check Engine Light is on Inspection reviews. Excellent Rating. Average Rating 4. Number of Reviews 5, Rating Summary.

P0266 MERCEDES-BENZ - Cylinder 2 Contribution/Balance Fault

Kenneth 7 years of experience. Request Kenneth.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 diagnostic.

P is an [OBD-II diagnostic trouble code] which indicates that the engine control module ECM detected the cylinder number 1 having low contribution to the running of the engine; low power. The compression in number 1 cylinder is low due to rockers, lifters, cam, rings or cylinder head gasket problems.

The engine may run rough and low on power. The engine will have a misfire causing a buck or jerk and a rough idle. The engine may lack some power during acceleration while the misfire is active. A misfiring cylinder can cause the engine to run lean on the failed cylinder if it is an injector and cause the engine to blow black smoke if it has low compression in the cylinder. Code P is triggered when the crankshaft sensor does not get an acceleration of the crankshaft from cylinder number 1 power stroke indicating that the cylinder is not contributing to engine power.

The injector could also be shorted or open and will cause additional codes that would go with the code P pointing to the injection failure.

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 With YourMechanic you can skip the auto shop altogether. They send certified and screened mechanics straight to your door and enable you to save big on car repair and maintenance. Cost of diagnosing the P code. No more waiting rooms! Our mechanics will come to you to diagnose and fix the P code.

Recent Check Engine Light is on Inspection reviews.

P0266 OBD-II Trouble Code: Cylinder 2 Contribution/Balance Fault

Excellent Rating. Average Rating 4. Number of Reviews 5, Rating Summary. Kenneth 7 years of experience. Request Kenneth. Kenneth is clearly a first-rate mechanic. He thoroughly inspected our vehicle and found that the engine light was on because of a crack in the filler neck hose. Rigoberto 10 years of experience. Request Rigoberto. This is my first time using Your Mechanic.

Rigoberto arrived earlier than the appointment time. He was very knowledgeable, helpful and answered all my questions. Jason 14 years of experience. Request Jason.

p0266 fault code

Jason was a pleasure to work with. He went above and beyond on my car and it was very much appreciated. Jason worked on my car for 4 days and he was very professional and punctual. He educated me on the health of my car. He was fair and flexible with his quotes. I highly recommend Jason and will be utilizing his services again. Alex 5 years of experience.Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

P Tech Notes Clogged or partially clogged fuel injector can cause this code. Start by performing an injector flush before replacing the injector. What does this mean? Cost of diagnosing the P code Labor: 1. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type.

P 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. Related Information. P Comments Help us improve AutoCodes. Leave a comment below or tell us if the information above help you fix the code. What are the symptoms on your vehicle for the P code? Have you replaced any parts?

Any information is appreciated. Repair Importance Level: 3. Why is the Engine Light ON? Home - About AutoCodes.

p0266 fault code

Posted and Edit by AutoCodes.We recommend Torque Pro. The engine control module ECM in the modern automobile continuously monitors and modifies engine operation to deliver the most efficient power. In this case, diagnosis and repair would be necessary to bring the engine back into specification.

p0266 fault code

Cylinder balance is one method the ECM uses to measure engine efficiency. With each cylinder firing, the crankshaft accelerates past 2, rpm, at that moment, and decelerates below 2, rpm. Using the CKP, the ECM can detect slight variations in engine rpm, that is, the acceleration of each power stroke, and can determine how much each cylinder is contributing to the engine, that is, the balance between each cylinder.

Depending on year, make, and model, DTC P may have number of causes. Here are some of the most common. Depending on the severity of the fault, you may or may not notice any drivability issues. Depending on the fault mode of the vehicle, you may experience reduced engine performance and fuel economy. If the problem is severe, you may experience rough idle or cylinder misfire.

Due to the complexity of the system, as well as tool expense and availability, you may be limited in your ability to diagnose this problem.

This site uses Akismet to reduce spam. Learn how your comment data is processed. Rcently truck starts normal, drive 20 miles and would bevin running rough, stopped and turn engine off then restart and it would run normal and tend not to do it again.

Checked codes, p and p, does this when ever i use it. Make a trip once in a while, use it to hall cattle to vet, sale barn etc. Skip to content. Most reacted comment. Hottest comment thread. Recent comment authors. Notify of. Mike maslonka.Your Toyota Yaris engine control system detects a problem, the computer stores the diagnostic trouble code P in its memory. Another consequence of P Toyota Yaris engine overheating may be a blown head gasket. Heat makes aluminum swell almost three times faster than cast iron.

Thermal stress can distort the head and make it swell in areas that are hottest like those between exhaust valves in adjoining cylinders, and areas that have restricted coolant flow like the narrow area that separates the cylinders.

The typical aluminum head swells most in the middle, which can crush the head gasket if the head gets too hot. This will usually cause the head gasket to leak compression between adjacent cylinders, or leak coolant into the cylinders.

There are currently two main types of cylinder deactivation used today, depending on the type of engine. P Toyota Yaris code for the pushrod design which uses solenoids to alter the oil pressure delivered to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, resulting in valves that cannot be actuated and remain closed.


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