Ford DTC Decoded: P1700
Code Meaning: Transmission intermediate failure.
What’s Wrong: This is a generic code that means input versus output is being delayed on the transmission.
Common Causes of This Issue: When this code is the only issue, trouble code, or symptom, it is almost always indicative of debris in the transmission. Most of the time, flushing the transmission will remedy this issue.
How to Flush a Transmission
- Jack and Jack Stands, or Ramps
- Drain Bucket - 5+ Gallon Capacity
- Transmission Fluid
Step 1: Getting the Vehicle Ready
- Get everything together and ready to go before you get started — this is not a job you are going to want to leave and come back to, that would risk contamination!
- Lift your vehicle into the air, safely. Only do so on a flat, paved surface!
Step 2: Draining Fluid
- Remove the transmission dipstick
- Locate where the transmission cooler lines enter the radiator and place your drain bucket underneath
- Loosen the hose clamps to the transmission cooler and pull them back, removing the transmission cooler
Step 3: Cycling Fluid
- Now you need to put the funnel in the dipstick tube and have your fluid ready
- Start your car and notice how it will start gushing out fluid at this point
- Quickly add 9 to 12 quarts of transmission fluid in through the funnel
Step 4: Filling the Transmission Back Up
- Replace the transmission cooler
- Lower your vehicle to the ground
- Add up to 3 quarts of fluid with the vehicle running — go by the dipstick reading carefully for the exact amount, adding a half quart at a time
Please note that flushing a transmission is a somewhat controversial practice in the automotive world. However, if you are getting this code and no others, it’s likely that your fluid is contaminated and needing to be flushed out and replaced.