Q: I have a engine code P1684 what does it mean? Thanks

asked by on

I have a check engine light on my car P 1684 what does it mean and what should I do?

My car has 113800 miles.
My car has an automatic transmission.

The fault code P1684 means that power to your powertrain control module (PCM) was interrupted. The most common cause of this is because of a weak battery. When the car is stated, the voltage drops low enough that it cuts power to the PCM for just a brief moment, which will set the fault. It can also be caused by a wiring issue to the PCM, or a bad connection in the battery cable. It may or may not cause issues with drivability. The fault should be thoroughly diagnosed by a qualified technician, such as one from YourMechanic.

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. I have a engine code P1684 what does it mean? Thanks

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: Can I add radiator fan?

The engine compartment of a 2011 Dodge Grand Caravan is not as big as older vans used to be. As a result, fitting an auxiliary fan to your radiator in an effort to make it run cooler might be difficult....

Q: No acceleration past 30 mph, then 10 mph

Hello there, thank you for asking about your 1999 Chrysler Intrepid. The engine oil being overfull will not turn on the Check Engine Light. However, a transmission problem could and that's what your issue sounds like. The first step in...

Q: MAP Sensor - 2001 Chevrolet Suburban 1500

Hello and thanks for your question. Check the harness to the MAP (Manifold Absolute Pressure) sensor for voltage. There should be a 5 volt reference that supplies power to the sensor. If you do not have power to the MAP...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.