P Codes - Transmission Control System

Diagnostic Trouble Code (DTC) Identification






DTC Types
Each DTC is directly related to a diagnostic test. The Diagnostic Management System sets DTC based on the failure of the tests during a trip or trips. Certain tests must fail two (2) consecutive trips before the DTC is set. The following are the four (4) types of DTCs and the characteristics of those codes:

TYPE A
- Emissions related
- Requests illumination of the MIL of the first trip with a fail
- Stores a History DTC on the first trip with a fail
- Stores a Freeze Frame (if empty) (DTC Information for 6VD1 engine)
- Stores a Fail Record
- Updates the Fail Record each time the diagnostic test fails

TYPE B
- Emissions related
- "Armed" after one (1) trip with a fail
- "Disarmed" after one (1) trip with a pass
- Requests illumination of the MIL on the second consecutive trip with a fail
- Stored a History DTC on the second consecutive trip with a fail (The DTC will be armed after the first fail)
- Stores a Fail Record when the first test fails (not dependent on consecutive trip fails)
- Updates the Fail Record each time the diagnostic test fails

(Some special conditions apply to misfire and fuel trip DTCs)

TYPE C (if the vehicle is so equipped)
- Non-Emissions related
- Requests illumination of the Service Lamp or the service message on the Drive Information Center (DIC) on the first trip with a fail.
- Stores a History DTC on the first trip with a fail.
- Does not store a Freeze Frame
- Stores Fail Record when test fails
- Updates the Fail Record each time the diagnostic test fails

TYPE D
- Non-Emissions related
- Not request illumination of any lamp
- Stores a History DTC on the first trip with a fail
- Does not store a Freeze Frame
- Stores Fail Record when test fails
- Updates the Fail Record each time the diagnostic test fails

IMPORTANT: Only four Fail Records can be stored. Each Fail Record is for a different DTC. It is possible that there will not be Fail Records for every DTC if multiple DTCs are set.