Code P1684, rough idle

2003 DODGE CARAVAN

255,000 MILES • 3.3L • V6 • 2WD • AUTOMATIC

CUMLAUF0213

MEMBER
1 POST

I have replaced the MAP sensor and coil pack, spark plugs and wires. And it is still running rough. I also did the turn the key 3 times and got the code P1684.

Jan 20, 2021 at 10:11 AM

SEVAG P

✓ASE Certified Mechanic
405 POSTS

hello,

I don't think engine rough running is related to fault code p1684, this fault is related to transmission, battery positive disconnected or disconnected from the transmission control unit. check the attachment below for the diagnostic procedure for fault code p1684.

use scan tool read the fault codes to narrow down our problem, check our guide how to read faults.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

https://www.2carpros.com/articles/engine-hesitates

Check for any vacuum leaks that can cause also engine rough running.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Thank you.

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Jan 20, 2021 at 11:20 AM