Skip the auto shop - Our mechanics make house calls

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?

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

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: engine light comes on after oil change service

Hi there: On modern vehicles, there are two different types of "warning lights"; routine service lights and trouble code warning lights. In most cases, when you have a routine service light that illuminates, it's set to do so at certain...

Q: Brakes locking up

You need to recheck the brake light switch installation. If it is adjusted incorrectly it could partly hold the brakes engaged and would lock up the brakes or keep them partly engaged. The light switch should not be bottomed out...

Q: My oil filter cap broke

It's very possible that the threads on the housing were damaged or warped when the old filter cap was overtightened so much. If neither of the new caps will cleanly go in, then I would recommend replacing the entire oil...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...