Q: p1682

asked by on

crank no start, no spark. p1682 code. new ignition switch installed and still same. is there relearning that needs to be done. i get different opinions. should i move on to ecm or is that beyond scope with reprogramming?

My car has 170000 miles.
My car has an automatic transmission.

The code you are getting P1682 is due to the ECM seeing a difference in the voltage levels of the two main power inputs to the ECM and will store the code when one voltage is different than the other one. You should have the power relay and start power relays replaced before anything else. The wiring on these vehicles are also known to get intermittent contact due to corrosion.

Try disconnecting the battery and disconnecting the ECM connectors and adding small amounts of dielectric lube to the pins and socket and reinstall the connection. Then have the vehicle battery reconnected and try to start the vehicle. If it still will not start, then you will need to have the complete pinpoint test for code P1682 done to isolate the problem. Do not go replacing the ECM unless tests say to replace it. You most likely will find connection issues.

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

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: Oil pressure low- engine reduced power

This light will usually come on when one of two things are happening. Either the motor is in fact low on oil or the oil pressure sending unit is not working properly and may be producing a faulty reading. I...

Q: Weak heat in all vents, cold air comes out of drivers. 2008 Jeep Wrangler

Hi there - I believe you have a problem with the heater air blend doors. As you know, the lack of heater function could have 5 causes: the engine is not getting up to correct temperature (center of the gauge)...

Q: P0446 Check engine code

Hi there. The system will set the message if it attempts a self test and finds atmospheric pressure in the tank. The gas cap may not be the concern here as this message is directly related to a large leak...

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...
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...
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...