This engine P1729 Code has multiple meanings from different sources. You should not use any wrong meaning of the code. You cannot fix the car engine problem due to use of the wrong meaning. The car engine’s real meaning is important but when it is not found, you must look for the automobile dictionary meaning and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 2 for Air Conditioning (A/C) Clutch Feedback Circuit High Voltage and 9 for Kick-Down Switch Failed Short. Look for the real meaning of the code first.