P062F Internal control module EEPROM error

OBD-II Trouble Code - P062F - Data Sheet

P062F - EEPROM error of the internal control module

What does DTC P062F mean?

This is a generic powertrain diagnostic trouble code (DTC) and is commonly applied to OBD-II vehicles. This may include, but is not limited to, vehicles from Buick, Chevy, GMC, Ford, Toyota, Nissan, Mercedes, Honda, Cadillac, Suzuki, Subaru, etc. Although general, exact repair steps may vary by year, brand , models. and transmission configuration.

When a P062F code persists, it means the powertrain control module (PCM) has detected an internal performance error with electronically erasable read-only memory (EEPROM). Other controllers may also detect an internal PCM performance error (in the EEPROM) and cause P062F to be saved.

The internal control module monitoring processors are responsible for the various controller self-testing functions and the overall accountability of the internal control module. The EEPROM input and output signals are self-tested and continuously monitored by the PCM and other relevant controllers. The transmission control module (TCM), traction control module (TCSM), and other controllers also communicate with the EEPROM.

In automotive applications, EEPROM provides the means to read, erase, and rewrite small amounts (bytes) of programmable memory. Using special programming, the EEPROM (or any part of the EEPROM) can be erased and overwritten sequentially. EEPROM is a group of transistors, consisting of three parts. It is usually removable and is fixed in a specially designed socket inside the PCM. When a failed PCM is replaced, the EEPROM usually needs to be removed and reused in the new PCM. The EEPROM and the new PCM will need to be programmed as a unit. Although EEPROM allows for over 1 million software changes and is designed to last hundreds of years, it can be sensitive to excessive heat and humidity.

Whenever the ignition is on and the PCM is energized, a self-test of the EEPROM is initiated. In addition to performing a self test on the internal controller, the Controller Area Network (CAN) also compares the signals from each individual module to ensure that each controller is working as expected. These tests are performed at the same time.

If the PCM detects an inconsistency in EEPROM functionality, a P062F code will be stored and a malfunction indicator lamp (MIL) may illuminate. In addition, if the PCM detects a problem between any of the on-board controllers that indicates an internal EEPROM error, a P062F code will be stored and a Malfunction Indicator Lamp (MIL) may illuminate. It may take several fail cycles to illuminate the MIL, depending on the perceived severity of the malfunction.

Photo of the PKM with the cover removed:

Which brands are covered by this code?

This code affects all OBD-II vehicles. This includes, but is not limited to, the following vehicles:

• Ford
• Honda
• Mazda
• Mercedes
• Volkswagen
• Toyota
• Nissan
• Cadillac
• Suzuki

What is the severity of this DTC?

Internal Control Module processor codes are to be classified as Severe. A stored P062F code can cause various handling problems.

What are some of the symptoms of a P062F code?

Symptoms of a P062F trouble code may include:

• Wide range of engine / transmission handling problems
• No trigger condition
• Reduced fuel efficiency
• Engine stall or idle stop
• Cooling fan not working
• A stalled or stalled engine
• Cooling fan not working
• No initial condition
• The car is using more fuel than usual

What are some of the common causes for the code?

Causes of this P062F DTC may include:

• Faulty controller or programming error
• Overheated PCM
• Water damage
• Faulty controller power relay or blown fuse
• Open or short circuit in the circuit or connectors in the CAN harness
• Insufficient grounding of the control module
• Defective EEPROM
• Overheated PCM
• Faulty controller power relay
• Blown fuse

What are some steps to troubleshoot the P062F?

Even for the most experienced and well-equipped professional, diagnosing the P062F code can be challenging. There is also the problem of reprogramming. Without the necessary reprogramming equipment, it will be impossible to replace the faulty controller and carry out a successful repair.

If there are ECM / PCM power supply codes, they obviously need to be corrected before attempting to diagnose the P062F.

There are some preliminary tests that can be performed before an individual controller is declared faulty. You will need a diagnostic scanner, a digital volt-ohmmeter (DVOM) and a source of reliable information about the vehicle.

Connect the scanner to the vehicle diagnostic port and get all stored codes and freeze frame data. You will want to write this information down just in case the code turns out to be intermittent. After recording all relevant information, clear the codes and test drive the vehicle until the code is cleared or the PCM enters ready mode. If the PCM enters ready mode, the code is intermittent and harder to diagnose. The condition that caused the P062F to be stored may even get worse before a diagnosis can be made. If the code is reset, continue with this short list of pre-tests.

When trying to diagnose P062F, information can be your best tool. Search your vehicle information source for technical service bulletins (TSBs) that match the stored code, vehicle (year, make, model, and engine) and symptoms displayed. If you find the correct TSB, it can provide diagnostic information that will help you to a great extent.

Use your vehicle information source to obtain connector views, connector pinouts, component locators, wiring diagrams, and diagnostic block diagrams relevant to the code and vehicle in question.

Use the DVOM to test the fuses and relays of the controller power supply. Check and replace blown fuses if necessary. Fuses should be checked with a loaded circuit.

If all fuses and relays are working properly, a visual inspection of the wiring and harnesses associated with the controller should be performed. You will also want to check the chassis and motor ground connections. Use your vehicle information source to obtain grounding locations for associated circuits. Use DVOM to check ground integrity.

Visually inspect the system controllers for damage caused by water, heat, or collision. Any controller damaged, especially by water, is considered defective.

If the power and ground circuits of the controller are intact, suspect a faulty controller or a controller programming error. Replacing the controller will require reprogramming. In some cases, you can purchase reprogrammed controllers from the aftermarket. Other vehicles / controllers will require onboard reprogramming, which can only be done through a dealership or other qualified source.

• Unlike most other codes, P062F is likely caused by a faulty controller or a controller programming error.
• Check the system ground for continuity by connecting the negative test lead of the DVOM to ground and the positive test lead to the battery voltage.

Can I still drive with code P062F?

You can still drive with code P062F. If detected early, a P062F code may not affect vehicle handling. However, a P062F code will cause more severe symptoms if not repaired, which can eventually cause drivability problems.

How hard is it to check code P062F?

The check will depend on the make, model and engine of your vehicle. If you are not used to checking code P062F, it is best to hire professional help. This will ensure that all protocols are followed and prevent further damage.

Code P062F is difficult to verify due to the amount of information required. The checks will depend on the make, model and year of your vehicle. You will need connector types, diagnostic flowcharts, and wiring diagrams, among other information.

You will also need to check the controller power fuses and relays as well as the controller wiring and harnesses. The landing gear and final ground landing gear will also need to be checked.

You will also need to inspect it for water, heat, or collision damage. These types of visual inspections are part of scheduled vehicle maintenance and may prevent errors such as code P062F in the future.

Toyota hilux RIVO Eeprom learning Dtc p062f internal control module eeprom error

Need more help with your P062F code?

If you still need help with the P062F error code, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.