P2610 OBD-II: ECM/PCM Internal Engine Off Timer Performance

What does code P2610 mean?

Code P2610 stands for Control Module Ignition Off Timer Performance.

The Powertrain Control Module (PCM) is a mini computer. Inside the PCM, you’ll find an architecture much like what’s inside your laptop or desktop computer. The main components of the PCM as are follows:

• Microprocessor: This is the central processing unit (CPU). The microprocessor also contains its own arithmetic and logic unit (ALU). Like any other computer, the CPU executes instructions received from memory, whereas the ALU handles the math and logic.
• Input and output modules: As the name implies, these modules handle input from outside devices, such as sensors. They also output data and commands, such as turning on the fuel injectors or commanding on the purge solenoid.
• Program and data memory. This is nonvolatile memory (memory that retains data even when power is removed) where the PCMs programming is stored. This is also where the default data parameters are kept.
• Data memory: This is volatile memory (memory that loses its data when power is removed). This is where data that results from program execution is stored. In other words, this is where data gets read and written to.
• Bus system: This is what connects the individual microprocessor components, like a mini highway.
• Clock: The clock ensures all the microprocessor components are operating at the same frequency.
• Watchdog module: As you probably guessed, the watchdog module keeps an eye on the execution of the microprocessor program.

Powertrain Control Module

Inside the PCM microprocessor, there’s also a built-in ignition timer. This device measures the time between when the engine is turned off and when it’s turned back on. This measurement is used for evaluation of different emissions controls. The central processing unit (CPU) inside the PCM accesses this timer when the measurement is needed. If the CPU can’t access the timer, code P2610 is stored.

P2610 symptoms

• An illuminated check engine light

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Common causes for P2610

Code P2610 is typically caused by one of the following:

• An internal PCM problem
• A problem with the PCM power or ground circuit

How to diagnose and repair P2610

Perform a preliminary inspection

Like your personal computer, sometimes the PCM has intermittent problems. This could cause code P2610 to pop up. The code can also result from low battery voltage. Clear it and see if it returns. If it does, the next step is to perform a visual inspection. A trained eye can check for issues such as broken wires and loose connections. If a problem is found, it should be repaired and the code cleared. If nothing is discovered, check for technical service bulletins (TSBs). TSBs are recommended diagnostic and repair procedures put out by the vehicle manufacturer. Finding a related TSB can greatly reduce diagnostic time.

Check the programming

The first thing a technician will do is see if the PCM programming is up to date. If it’s not, the PCM can be re-flashed using software supplied by the manufacturer.

Reset the PCM

When your computer freezes up, what do you do? You reboot it. The same thing can be done with your vehicle’s PCM. A PCM reset is accomplished by jumping the battery cables (not terminals) for approximately 30 minutes.

Note: This should only be attempted by a professional.

Check the PCM circuit

Like any other electrical device, the PCM must have good power and ground. Both can be checked using a digital multimeter (DMM). If there’s a problem with PCM circuit, the factory wiring diagram will need to be traced to isolate the problem. Then, the open or short circuit can be repaired.

Replace the PCM

Basically, this code can only be caused by a problem with the PCM or its circuit. So, if everything else checks out to this point, it’s probably time to replace the PCM.

Other diagnostic codes related to P2610

• P0602: Code P0601 indicates the PCM is not programmed.
• P0606: Code P0606 indicates an internal PCM performance problem.
• P060B: Code P060B indicates a problem with the PCM analog to digital converter.
• P061C: Code P061C indicates the PCM is having a problem accessing engine speed data.
• P062C: Code P062C indicates the PCM is having a problem accessing vehicle speed data.
• P062F: Code P062C indicates an internal PCM longer term memory data.

Code P2610 technical details

P2610 and related DTCs refer to the condition of the internal microprocessor in the PCM. The PCM monitors its ability to access, read and write memory. If it cannot perform any of those functions, it sets one of the DTCs listed in this article.