Need a P0605 diagnosis? Trust our experts.
Oops! We got lost!
Your location cannot be detected. Please enter your zipcode for nearby shops.
P0605 Severity
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
The engine control module (PCM) performs many vital functions in a modern vehicle, including management of the Fuel and Ignition Systems. The PCM regularly runs a self-diagnosis function where it performs normal mathematical calculations, and if the results of these calculations are not as expected the PCM will set code P0605.
RepairPal Car Genius™ is a free resource for vehicle owners seeking advice on maintenance, auto repair, shop inquiries, estimates, and finding a trustworthy repair shop in your area.
Call us at 877-913-1554
Available 9am – 6pm ET Monday through Friday
OBD-II Code P0605 is defined as a Internal Control Module Read Only Memory (ROM) Error
The PCM or Power Train Control Module performs many vital functions in a modern vehicle, such as management of the Fuel System, Ignition System, Transmission, Anti-Lock Brake and Traction Control systems. The PCM regularly runs a self-diagnosis function where it performs normal mathematical calculations, and if the results of these calculations are not as expected, a code such as P0605 code will be set.
Code P0605 means that the PCM's Read Only Memory (ROM) section is not passing its routine self test. This is critical because the ROM stores all of the PCM's operating system software. If this part of the PCM's functionality is unreliable, the powertrain's main computer can't be trusted to accurately do its job and may need to be replaced.
When the code P0605 is set in the Powertrain Computer, it means that the Powertrain Computer or PCM is failing its Read Only Memory (ROM) self-check and has found errors within its Read Only Memory functions. In many cases, the PCM is not getting a high quality, consistent 12 volt power and ground signal. However in some cases, actual Memory modules are defective and the PCM needs to replaced and re-programmed. But, before you replace the PCM, be sure to check for any shorted output devices that may have cause the Memory functions to fail.
When diagnosing a P0605 code, it is important to record any other codes and the P0605 freeze frame data. Then one should duplicate the code setting conditions with a test drive. Pay close attention to the engine load, throttle position, RPM, and road speed because a P0605 can be difficult to detect.