P1681 Fault Code
You can find information about the P1681 fault code on this page.
BE WARNED! This particular code can mean a different thing depending on what make the car is, check below.
Manufacturer-Specific Meanings

Acura P1681
"A/T FI Signal A Low Input"

Audi P1681
"Contr.Unit Programming,"

Jeep P1681
"No I/P Cluster CCD/J1850 Messages Received"

Dodge P1681
"No I/P Cluster CCD/J1850 Messages Received"

Chrysler P1681
"No I/P Cluster CCD/J1850 Messages Received"

Honda P1681
"Automatic Transaxle FI Signal A Low Input"

Volkswagen P1681
"Control Module Programming Not Finished"
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