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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Necesito cambiar bomba de agua, thermostate, lower radiator hose, cuál es el monto total de reparación incluyendo los repuestos.

Hola. Para una cotización rapida y precisa puede subir a nuestra cita y entregar su informacion de vehiculo. Los precios cambian con locacion, servicio, y modelo de vehiculo so no podria darle una cotizacion sin esa informacion.

Q: EVAP Vent valve solenoid code p0449

This suggests you may have a bad EVAP control module. A battery voltage is supplied to the evaporative emission (EVAP) canister vent solenoid valve. The control module grounds the EVAP canister vent solenoid valve control circuit to close the valve...

Q: engine power reduced

Hello, thank you for writing in. The diagnostic code was related to the transmission shift circuit. The computer has detected an issue, and that likely the reason for reduced power. If the transmission shifts too early, your vehicle will bog...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...