P0601 obd2 code and how to check your engine computer wiring terminals

Testing P0601 obd2 code requires the basic knowledge of engine computer testing using your DVOM. As such, determine the voltages for the power supply, reference and ground wires. Review also the obd2 code listings as shown below.

P0601 ICM Memory failure

tps sensor wiring

This code is an internal pcm (power control module) failure indicator and can be checked in various ways. To start, make sure you have the right pcm installed in your engine by getting your VIN number and verifying that number to your dealer. Once verified, you can test the pcm by checking the power and ground supplies reading as extensively discussed in ATS video.

For advance test, a scan tool can be used and while starting the engine, determine if the pcm is counting the starts, if not the pcm is definitely defective. Just to be on a safe mode, check ATS for the various TSB (service bulletins) that came out for the pcm and sometimes, a simple reprogramming of the pcm by the dealer can fix this code.


Using this wiring diagram here, go to the TPS sensor location. Using your DVOM, check for the presense of 5 volt reference on the third wire with key on engine off. If the 5 volts is not present, disconnect the sensor. Check the 5 volts presence at the wire again and if it shows up, the sensor is defective. Replace and test again. For more tests, joined ATS.

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More OBD2 Code Fixes

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