Q: car cranks but wont start. check engine light on. code p0685

asked by on

Drove home from work, stopped on my way. car would crank but not start. my dash said "engine power reduced" i unhooked the battery and came back to the car an hour or so later and it started right up, I drove it about 3 miles and same thing, except this time it happened while i was driving. I called a tow truck driver and when he got there he jump started the car and it started right up on the first try. "Engine power reduced" warning went away but check engine light came on. I bought a code reader and it gave me p0685 "Ecn/pcm power control module relay/open". Car starts anytime i try to start it now, but i dont want to drive it anywhere and have to get it towed home again.

My car has 149000 miles.
My car has an automatic transmission.

The code P0685 indicates a problem with Engine Control Ignition Relay Control Circuit. This may have a poor connection or need to be replaced. I would recommend having an expert from YourMechanic come to your home to diagnose and repair.

Was this answer helpful?
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. car cranks but wont start. check engine light on. code p0685

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: told I need front & rear brakes.............I have no symptoms yet

The brake system on a car consists of multiple components that have to ALL be evaluated whenever brake "pads" are replaced. Mass production "mechanics" working in the literal "mass production" repair shops will tell you that you need new "brakes"...

Q: The display on my car went out

The display should have a function button that allows the menus to be changed. If the display does not work in any of the menus, it is possible that the display is failing. The displays generally do not last the...

Q: Gas not going through new filter

If you have recently installed a new fuel filter, ensure that the filter was installed correctly. Fuel filters are only designed for the fuel to flow in one direction. If the fuel filter was installed backwards, this will prevent the...

Related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.