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  Introduction
 

Vehicles 1996 and newer are OBD-II compliant - meaning these vehicles are equipped with an on-board diagnostics system called OBD-II.  The OBD-II system monitors various vehicle systems and subsystems and sets a diagnostic trouble code (DTC) when a problem (or fault) is detected.  Your vehicle's check engine light turns on when a diagnostic trouble code is set.

When the check engine light illuminates, an OBD-II scanner is used toTransmission Trouble Codes retrieve the diagnostic trouble code(s) that are stored in the system.  The most common diagnostic trouble codes begin with the letter "P", which stands for Powertrain.  Powertrain (or "P") DTCs include the engine, transmission and emissions systems.

Diagnostic Trouble Codes P0700 through P0799 are transmission related codes.  Any code within this range point to a transmission related fault.

   
  Diagnostic Trouble Codes P0700 thru P0799
   
 
P0700....Transmission Control System (MIL Request)
P0701....Transmission Control System Range/Performance
P0702....Transmission Control System Electrical
P0703....Torque Converter/Brake Switch B Circuit
P0704....Clutch Switch In put Circuit Malfunction
P0705....Transmission Range Sensor Circuit Malfunction (PRNDL Input)
P0706....Transmission Range Sensor Circuit Range/Performance P0707....Transmission Range Sensor Circuit Low Input
P0708....Transmission Range Sensor Circuit High Input
P0709....Transmission Range Sensor Circuit intermittent
P0710....Transmission Fluid Temperature Sensor Circuit
P0711....Transmission Fluid Temperature Sensor Circuit Range/Performance
P0712....Transmission Fluid Temperature Sensor Circuit Low Input P0713....Transmission Fluid Temperature Sensor Circuit High Input P0714....Transmission Fluid Temperature Sensor Circuit Intermittent P0715....Input/Turbine Speed Sensor Circuit
P0716....Input/Turbine Speed Sensor Circuit Range/Performance P0717....Input/Turbine Speed Sensor Circuit No Signal
P0718....Input/Turbine Speed Sensor Circuit Intermittent
P0719....Torque Converter/Brake Switch B Circuit Low
P0720....Output Speed Sensor Circuit
P0721....Output Speed Sensor Circuit Range/Performance
P0722....Output Speed Sensor Circuit No Signal
P0723....Output Speed Sensor Circuit Intermittent
P0724....Torque Converter/Brake Switch B Circuit High
P0725....Engine Speed Input Circuit
P0726....Engine Speed Input Circuit Range/Performance
P0727....Engine Speed Input Circuit No Signal
P0728....Engine Speed Input Circuit Intermittent
P0730....Incorrect Gear Ratio
P0731....Gear 1 Incorrect Ratio
P0732....Gear 2 Incorrect Ratio
P0733....Gear 3 Incorrect Ratio
P0734....Gear 4 Incorrect Ratio
P0735....Gear 5 Incorrect Ratio
P0736....Reverse Incorrect Ratio
P0737....TCM Engine Speed Output Circuit
P0739....TCM Engine Speed Output Circuit Low
P0739....TCM Engine Speed Output Circuit High
P0740....Torque Converter Clutch Circuit
P0741....Torque Converter Clutch Circuit Performance or Stuck Off
P0742....Torque Converter Clutch Circuit Stuck On
P0743....Torque Converter Clutch Circuit Electrical
P0744....Torque Converter Clutch Circuit Intermittent
P0745....Pressure Control Solenoid 'A'
P0746....Pressure Control Solenoid 'A' Performance or Stuck Off
P0747....Pressure Control Solenoid 'A' Stuck On
P0748....Pressure Control Solenoid 'A' Electrical
P0749....Pressure Control Solenoid 'A' Intermittent
P0750....Shift Solenoid 'A'
P0751....Shift Solenoid 'A' Performance or Stuck Off
P0752....Shift Solenoid 'A' Stuck On
P0753....Shift Solenoid 'A' Electrical
P0754....Shift Solenoid 'A' Intermittent
P0765....Shift Solenoid 'B'
P0756....Shift Solenoid 'B' Performance or Stuck Off
P0757....Shift Solenoid 'B' Stuck On
P0758....Shift Solenoid 'B' Electrical
P0759....Shift Solenoid 'B' Intermittent
P0760....Shift Solenoid 'C'
P0761....Shift Solenoid 'C' Performance or Stuck Off
P0762....Shift Solenoid 'C' Stuck On
P0763....Shift Solenoid 'C' Electrical
P0764....Shift Solenoid 'C' Intermittent
P0765....Shift Solenoid 'C'
P0766....Shift Solenoid 'D' Performance or Stuck Off
P0767....Shift Solenoid 'D' Stuck On
P0768....Shift Solenoid 'D' Electrical
P0769....Shift Solenoid 'D' Intermittent
P0770....Shift Solenoid 'E'
P0771....Shift Solenoid 'E' Performance or Stuck Off
P0772....Shift Solenoid 'E' Stuck On
P0773....Shift Solenoid 'E' Electrical
P0774....Shift Solenoid 'E' Intermittent
P0775....Pressure Control Solenoid 'B'
P0776....Pressure Control Solenoid 'B' Performance or Stuck Off
P0777....Pressure Control Solenoid 'B' Stuck On
P0778....Pressure Control Solenoid 'B' Electrical
P0779....Pressure Control Solenoid 'B' Intermittent
P0780....Shift
P0781....1-2 Shift
P0782....2-3 Shift
P0783....3-4 Shift
P0784....4-5 Shift
P0785....Shift/Timing Solenoid
P0786....Shift/Timing Solenoid Range/Performance
P0787....Shift/Timing Solenoid Low
P0788....Shift/Timing Solenoid High
P0789....Shift/Timing Solenoid Intermittent
P0790....Normal/Performance Switch Circuit
P0791....Intermediate Shaft Speed Sensor Circuit
P0792....Intermediate Shaft Speed Sensor Circuit Range/Performance
P0793....Intermediate Shaft Speed Sensor Circuit No Signal
P0794....Intermediate Shaft Speed Sensor Circuit Intermittent
P0795....Pressure Control Solenoid 'C'
P0796....Pressure Control Solenoid 'C' Performance or Stuck off
P0797....Pressure Control Solenoid 'C' Stuck On
P0798....Pressure Control Solenoid 'C' Electrical
P0799....Pressure Control Solenoid 'C' Intermittent

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  Transmission "Fail-Safe" or "Limp" Mode
  When a transmission fault is detected by the OBD-II system, the transmission may go into fail-safe (or "limp" mode as it is also called) in order to protect the transmission from internal damage that could be caused by the fault.  While in fail-safe (or limp mode) the transmission will be locked in either 2nd. or 3rd. gear.

The purpose of the transmission fail-safe mode is to allow you to drive home or to the nearest repair facility to have the transmission checked out.  While in limp mode, you should limit your speed to between 35 and 40 mph.  Driving at increased speeds or for a long distance while in fail-safe will cause the transmission to overheat, which can quickly damage friction clutches, seals and other internal transmission components.

Note: A transmission in fail-safe (or limp mode) will sometimes correct itself when the engine is shut off and restarted.  So, if you find yourself in this situation, find a safe place to pull off the road and shut the engine off.  Wait one minute and then restart the engine. 
   
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