P268D - OBD Trouble Code

<<See All OBD Codes

Only for our customers, Parts Avatar has listed here all that you need to know about the error code P268D. This OBD-II code decreased engine performance is also determined as a cylinder 2 injector data incompatible. There are calibration numbers printed on the side of the fuel injectors. It is important to register this number into the engine computer (PCM) and glow plug control module (GPCM) whenever the injector is replaced. The code P268D is set whenever the calibration number isn’t registered to both modules.

It is notable that every injector has a code stored in the electrically erasable programmable read-only memory (EEPROM). This helps greatly in providing information to the electronic control unit (ECU) regarding the variations of that injector from a theoretical average injector. The powertrain control module (PCM) stores the OBD-II code P268D whenever if the injector code is faulty or absent.

What causes this problem with the Cylinder 2 Injector Data Incompatible?

• Failed attempt to reprogram the PCM or fuel control module (especially if the PCM or controller replacement has been performed)
• Damaged fuel injectors
• Corroded injector wiring or connectors
• Short circuited or disconnected wiring or connectors linked to the interfacing control modules, PCM input circuitry from the engine sensors
• Loose or burnt ground wires to the PCM or other control modules
• Internal problems in the PCM
• Failure in the program injector

1. Fuel Injectors - Distorted fuel injectors can end up being the chief host inviting the error code P268D. In addition to this, the driver is likely to observe surging and bucking under throttle loads. So replacing one can be one of the wisest decisions to avoid a problematic system.
2. Powertrain Control Module - Facing the error code P268D? An inferior quality powertrain control module can always be hazardous for the system also it is one of the primal causes behind the occurring of the error code P268D. Apart from this, it is likely to cause sluggish cranks and difficulties in starting the engine. Tune into Parts Avatar for supreme quality powertrain control module at economical prices.  
3. Glow Plug Control Module - The glow plug control module functions to determine the timing and electric current required by the glow plugs according to the input received from the engine control unit. So, a malfunctioning one should be changed immediately. Log into Parts Avatar for your new GPCM.
4. Engine Wiring Connectors - Weary and damaged engine wiring connectors can often be problematic. So, to add some spark to your ride you definitely need the perfect quality engine wiring connectors offered at Parts Avatar. Isn’t that just the perfect deal?
5. Primary Ground Wires - The ground wires serve the purpose of providing a path back to the source of electric current. So short circuited or open ones can adversely affect the overall functionality of the engine. We advise you to get yours changed from Parts Avatar immediately.

It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD code P268D here:

Common Symptoms

• Low engine performance
• The driver may observe a no-start condition

Want to correct the trouble code P268D? Read these points mentioned below:

• Replacement or repairs should be performed of all the damaged fuel injectors
• Fix a malfunctioning PCM or glow plug control module
• All the corroded wiring and connectors linked to all the electrical components should be visually inspected. Make sure you repair or replace all the damaged or corroded ones immediately
• Mend or restore all the defective fuel injectors

Parts Avatar Canada is here to solve all your issues related to car parts. We have stocked a wide range of best priced fuel injectors, PCM, glow plug control modules, fuel injectors, injectors connectors, injector wiring, connectors, cinder block, piezoelectric, engine block, cylinder head and a lot more to help you out in fixing your car.

If you want to easily diagnose this fault code, then all you have to do is to follow the steps which are mentioned below:

• This type of code is found in applications with diesel engines.
• A lot of late model diesel fuel injectors are separately numbered for electronic identification
• For that specific injector to be recognized by the controller, this alpha numeric identification number should be programmed into the PCM (or auxiliary controller).
• the technician will be permitted by many scanners to revive these alpha numeric numbers (or codes) before controller replacement.
• If the numbers have been properly revived, they can be entered again into the new controller upon replacement and no codes will be presented.
• If the numbers have not been entered correctly, this type of code will be the result.
• To obtain the individual alpha numeric codes, you can do so by removing the appropriate valve cover and physically reviving it.
• Presentation of this type of code usually indicates that a malfunction has occurred in the reprogramming process or the CAN.
• CAN is the acronym for “controller area network”. The CAN is a representation of a communication bus that allows numerous microcontrollers to communicate with each other without the requirement of a host computer.
• Designed especially for automotive use, this is a message based protocol.
• The CAN bus network is actually a complicated accumulation of wiring harnesses and connectors which are used as a channel of information shared between two or more automotive control modules.
• Virtually every electrical function of the vehicle is controlled by these controllers, with the PCM as the primary controller.
• Input data from various sensors is received by the control modules. These control modules emit output signals to system components and other control modules.
• For example: input signals are received by the PCM from the vehicle speed sensor.
• This signal is methodically forwarded to affected control modules that use the data to accomplish various other tasks.
• Data is utilized by the cruise control module for speed control purposes, the traction control system makes use of data to maintain vehicle traction control strategy, and the anti-lock brake controller compares the vehicle speed from the PCM with the data inputs from individual wheel speed sensors to use the anti-lock braking system. Also, these failures in the internal control module are generally identified by the module but the CAN bus is also valid as other control modules are likely to identify the error also.
• Cases of individual control module failure are rare but possible.
• Comply with the manufacturer’s recommended testing method for the diagnosis of the individual control module and change them as and when required.
• Replacement of nearly all of these control modules will need reprogramming.
• For attempting to successfully diagnose the conditions which caused this code to be stored, several tools are necessarily required.
• For performing a successful diagnosis, a suitable OBD-II scanner (or code reader) and a digital volt/ohmmeter will be instrumental.
• It will also be necessary to gain access to access a manufacturer’s wiring schematic for the successful diagnosis of this code. All PCM wiring and connectors need to be carefully examined visually.
• Fix or replace defective, disconnected, shorted or burnt wiring, connectors, and components as required.
• It is advisable to always retest the system after the repairs have been completed to ensure success. If all system wiring, connectors, and components (inclusive of fuses) seem to be working normally, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data.
• This information can be extremely helpful in the diagnosis of intermittent conditions that may have caused this code to get stored.
• Proceed by clearing the code and operating the vehicle to check whether it returns.
• This will help to confirm whether the malfunction is intermittent or not. Once all the codes have been cleared, test drive the vehicle to check if the code returns.
• Failure of the code to return immediately indicates that you may have an intermittent condition.
• It can be quite difficult to diagnose intermittent conditions and in extreme cases may have to be allowed to become worse before an accurate diagnosis can be attempted.
• Unlike other diagnostic codes, this type of code involves a bulk of circuitry which should best be left to a professional.
• The general area of the malfunction can be determined much more quickly and easily with the help of an experienced technician with a specialized scanner (Autohex or Tech II) than someone using a code reader and a digital volt ohmmeter.
• Disconnecting and testing every pin of the CAN bus individually could turn out to be extremely time consuming and cost ineffective.
• Additionally, some type of memory saving device must be installed in case the PCM and other controllers lose their memory and need reprogramming.
• A specialized diagnostic CAN scanner will display pin values and control module operation without the risk of a meltdown.
• It can ensure an accurate diagnosis of computer and circuitry issues by monitoring vehicle operation while the vehicle is being operated.
• For the diagnosis of this type of code with the help of a digital volt ohmmeter would require testing thousands of circuits, separately.
• Any misplaced test could damage expensive control modules and require that the vehicle be completely reprogrammed. At the most, a continuity test may be performed after all control modules have been disconnected, and this task could take up 40 hours or more depending upon the vehicle.
• In some applications, upto 18 separate control modules are installed. If you take a decision in favour of undertaking this tedious task, you should begin with a thorough visual interrogation of all system circuitry, connectors and fuses.
• Also, probe the control module ground circuits for continuity with battery ground. It is possible that these types of codes are generally stored due to a damaged or disconnected system grounds.
• Use an auxiliary ground cable as it can be really helpful in diagnosing system ground problems.
• Also, at times, the engine and transmission ground cables, straps and wires maybe left dangling after repairs have been performed.
• Search for open or burnt electrical connectors that may increase circuit resistance and stimulate these types of codes to be stored. We advise you to acquire a CAN bus system wiring diagram and/or pin out value chart, then make use of the digital volt ohmmeter to test continuity between individual controller connectors.
• All the results should be compared to the manufacturer's referenced values. Then make sure you repair or replace all the loose or shorted circuits as required.
• Everytime, replacing damaged wiring can prove to be more budget friendly rather than trying to remove it from the complex web of wiring harnesses.

Common Mistakes When Diagnosing the P268D Code

Here we have listed a few common mistakes that should be avoided while diagnosing the error code:

• A failed attempt at reprogramming the fuel injectors according to the powertrain control module (PCM) and the glow plug control module.