Skip the auto shop - Our mechanics make house calls

Q: Reduced Power and P0601 code is found in computer.

asked by on

My truck is going into reduced power mode while driving. It will also die and go into reduced power mode while I start it to warm up in the driveway. It seems random. I can go 2 weeks without it happening or sometimes it will do it 4 times a day. I am also getting P0601 and P0449. Could the bad evap solenoid cause the pcm to not read right and throw the p0601?

So far, we have changed the spark plugs, the battery (it was dead at the post when all of this started), the throttle body and a wire going from the throttle body. Is there anything else we can do other than replace the pcm?

My car has an automatic transmission.

Hi there. The P0449 evaporative code is on for either an electrical circuit malfunction to the vent solenoid or the vent solenoid on the emissions circuit has failed. The P0601 code comes on when the computer can no longer register any circuits tests. This means that the ECM (computer) has lost all of its memory and cannot get it back and would need to be either flashed (reprogrammed) or replaced. Before you decide to replace the ECM or have it flashed, check the battery and make sure that it has a full charge. If you need further assistance with the check engine light codes, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Reduced Power and P0601 code is found in computer.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Clock spring compatibility

I do believe that the clock spring will still work considering that the steering wheel is the same and the steering wheel travel is the same. The best way to be certain is to compare the part numbers from the...

Q: 1999 firebird every now and then dies while driving and low engine power light comes on

A bad mass airflow (MAF) sensor can cause loss of power, no starts, and lean or rich conditions. If cleaning the sensor did not get rid of the P0102 trouble code, then replace the MAF sensor and clear the...

Q: Reduced engine power.

Check the wiring to the throttle pedal position sensor on the gas pedal and see if there is a loose or broken wire in the pig tail. Fix any wires that are coming apart and wrap up the wiring with...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...