Diagnostic Trouble Codes: Notes
Diagnostic trouble codes (DTC's) are codes stored by the Transmission Control Module (TCM) that help us diagnose Transmission problems. They are viewed using the DRBIII® scan tool. For DTC definition, see DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION .
Always begin by performing a visual inspection of the wiring, connectors, cooler lines and the transmission. Any obvious wiring problems or leaks should be repaired prior to performing any diagnostic test procedures. Some engine driveability problems can be misinterpreted as a transmission problem. Ensure that the engine is running properly and that no PCM DTC's are present that could cause a transmission complaint.
If there is a communication BUS problem, trouble codes will not be accessible until the problem is fixed. The DRBIII® will display an appropriate message. The following is a possible list of causes for a BUS problem:
- open or short to ground/battery in PCI BUS circuit.
- internal failure of any module or component on the BUS
Each diagnostic trouble code is diagnosed by following a specific testing sequence. The diagnostic test procedures contain step-by-step instructions for determining the cause of a transmission diagnostic trouble code. Possible sources of the code are checked and eliminated one by one. It is not necessary to perform all of the tests in this article to diagnose an individual code. These tests are based on the problem being present at the time that the test is run.
If the TCM records a DTC that will adversely affect vehicle emissions, it will request (via the communication BUS) that the PCM illuminate the Malfunction Indicator Lamp (MIL). Although these DTC's will be stored in the TCM immediately as a 1 trip failure, it may take up to five minutes of accumulated trouble confirmation to set the DTC and illuminate the MIL. Three consecutive successful OBDII/EURO III trips or clearing the DTC's with a diagnostic tool (DRBIII® or equivalent) is required to extinguish the MIL. When the TCM requests that the PCM illuminate the MIL, the PCM sets a DTC ($89) to alert the technician that there are DTC's in the TCM. This must also be erased in the PCM in order to extinguish the MIL.
| DTC | Description |
|---|---|
| P0122 | THROTTLE POSITION SENSOR/APPS LOW |
| P0123 | THROTTLE POSITION SENSOR/APPS HIGH |
| P0124 | THROTTLE POSITION SENSOR/APPS INTERMITTENT |
| P0218 | HIGH TEMPERATURE OPERATION ACTIVATED |
| P0562 | LOW BATTERY VOLTAGE |
| P0604 | INTERNAL TCM |
| P0605 | INTERNAL TCM |
| P0613 | INTERNAL TCM |
| P0706 | CHECK SHIFTER SIGNAL |
| P0711 | TRANSMISSION TEMPERATURE SENSOR PERFORMANCE |
| P0712 | TRANSMISSION TEMPERATURE SENSOR LOW |
| P0713 | TRANSMISSION TEMPERATURE SENSOR HIGH |
| P0714 | TRANSMISSION TEMPERATURE SENSOR INTERMITTENT |
| P0715 | INPUT SPEED SENSOR ERROR |
| P0720 | OUTPUT SPEED SENSOR ERROR |
| P0725 | ENGINE SPEED SENSOR CIRCUIT |
| P0731 | GEAR RATIO ERROR IN 1ST |
| P0732 | GEAR RATIO ERROR IN 2ND |
| P0733 | GEAR RATIO ERROR IN 3RD |
| P0734 | GEAR RATIO ERROR IN 4TH |
| P0736 | GEAR RATIO ERROR IN REVERSE |
| P0740 | TORQUE CONVERTER CLUTCH CONTROL CIRCUIT |
| P0750 | LR SOLENOID CIRCUIT |
| P0755 | 2/4 SOLENOID CIRCUIT |
| P0760 | OD SOLENOID CIRCUIT |
| P0765 | UD SOLENOID CIRCUIT |
| P0836 | 4WD MUX SWITCH STUCK |
| P0837 | 4WD MUX SWITCH PERFORMANCE |
| P0838 | 4WD MODE SENSOR LOW |
| P0839 | 4WD MODE SENSOR HIGH |
| P0841 | LR PRESSURE SWITCH SENSE CIRCUIT |
| P0845 | 2/4 HYDRAULIC PRESSURE TEST FAILURE |
| P0846 | 2/4 PRESSURE SWITCH SENSE CIRCUIT |
| P0870 | OD HYDRAULIC PRESSURE TEST FAILURE |
| P0871 | OD PRESSURE SWITCH SENSE CIRCUIT |
| P0884 | POWER UP AT SPEED |
| P0888 | RELAY OUTPUT ALWAYS OFF |
| P0890 | SWITCHED BATTERY |
| P0891 | TRANSMISSION RELAY ALWAYS ON |
| P0897 | WORN OUT/BURNT TRANSAXLE FLUID |
| P0944 | LOSS OF PRIME |
| P0992 | 2-4/OD HYDRAULIC PRESSURE TEST FAILURE |
| P1652 | SERIAL COMMUNICATION LINK MALFUNCTION |
| P1684 | BATTERY WAS DISCONNECTED |
| P1687 | NO COMMUNICATION WITH THE MIC |
| P1694 | BUS COMMUNICATION WITH ENGINE MODULE |
| P1775 | SOLENOID SWITCH VALVE LATCHED IN TCC POSITION |
| P1776 | SOLENOID SWITCH VALVE LATCHED IN LR POSITION |
| P1790 | FAULT IMMEDIATELY AFTER SHIFT |
| P1793 | TRD LINK COMMUNICATION ERROR |
| P1794 | SPEED SENSOR GROUND ERROR |
| P1797 | MANUAL SHIFT OVERHEAT |