AUTOMATIC TRANSMISSION SYSTEM, Diagnostic DTC:P2808

DTC Code DTC Name
P2808 Pressure Control Solenoid "G" Performance (Shift Solenoid Valve SL4)

DESCRIPTION

Based on signals from the transmission speed sensors (NT and NC), the gear position is detected. If the detected gear position is different than the commanded gear position, the TCM detects related mechanical problems in the shift solenoid valves, valve body and automatic transmission.

Tech Tips

Gear shift position when a problem occurs in shift solenoid valve SL4:

TCM gear shift command 1st 2nd 3rd 4th 5th 6th 7th 8th
Actual gear position under SL4 stuck ON malfunction 4th 4th 3rd 4th 6th 6th 7th 6th
Actual gear position under SL4 stuck OFF malfunction 1st 2nd 3rd N (1st)* 5th N* 7th 8th

*: Neutral

DTC Code

DTC Detection Condition


  1. Diagnosis Condition

  2. Malfunction Status

  3. Malfunction Time

  4. Other

 Trouble Area
P2808

  1. ECT is 40°C (104°F) or higher, ATF temperature is -10°C (14°F) or higher, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, speed sensors (NT, NC3, SP2), engine coolant temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)

  2. One of the following occurs:


    1. When gear shifts to 1st are requested by the TCM, the actual gear changes to 4th gear

    2. When gear shifts to 2nd are requested by the TCM, the actual gear changes to 4th gear

    3. When gear shifts to 5th are requested by the TCM, the actual gear changes to 6th gear

    4. When gear shifts to 8th are requested by the TCM, the actual gear changes to 6th gear

  3. Malfunction status occurs 2 times (1 trip)

  4. 2 trip detection logic

  • Shift solenoid valve SL4

  • Valve body assembly

  • Torque converter clutch assembly

  • Automatic transmission assembly
P2808

  1. ECT is 40°C (104°F) or higher, ATF temperature is -10°C (14°F) or higher, and the vehicle is driven with the shift lever in D (no malfunctions are detected in shift solenoid valve SL1, 2, 3, 4 and 5, SR, speed sensors (NT, NC3, SP2), engine coolant temperature sensor, oil temperature sensor, knock control sensor, electronic throttle, or CAN2)

  2. When gear shifts to 4th or 6th are requested by the TCM, the engine overruns (neutral status)

  3. Malfunction status continues for 0.5 sec. or more (1 trip)

  4. 2 trip detection logic

  • Shift solenoid valve SL4

  • Shift solenoid valve SLT

  • Valve body assembly

  • Torque converter clutch assembly

  • Automatic transmission assembly

MONITOR DESCRIPTION

The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft speed, intermediate (counter) shaft speed and output shaft speed, the TCM detects the actual gear position (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear position). When the gear position commanded by the TCM and the actual gear position are not the same, the TCM illuminates the MIL.

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC OUTPUT (IN ADDITION TO DTC P0796, P2714 AND P2808)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Powertrain / ECT / DTC.

    5. Read the DTCs using the intelligent tester.

      Result
      Display (DTC output) Proceed to
      Only P2714 and P2808 are output A
      Only P2808 is output B
      Only P0796, P2714 and P2808 are output C
      P0796, P2714, P2808, and other DTCs are output D

      Tech Tips

      If any other codes besides P0796, P2714 and P2808 are output, perform troubleshooting for those DTCs first.


    B

    INSPECT SHIFT SOLENOID VALVE SL4 Click here

    C

    GO TO DTC P0796 FLOWCHART Click here

    D

    GO TO DTC CHART Click here

    A

  2. CLEAR DTC AND PERFORM STALL SPEED TEST


    1. Clear the DTCs Click here.

      Tech Tips

      Write down the currently output DTCs before clearing them.

    2. Perform the stall speed test Click here.

      Result
      Test Condition Proceed to
      Stall speed test can be performed A
      Stall speed test cannot be performed B

    B

    INSPECT SHIFT SOLENOID VALVE SLT Click here

    A

  3. INSPECT SHIFT SOLENOID VALVE SL4


    1. A01GNU1E09

      Remove shift solenoid valve SL4 Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal 1 of shift solenoid valve SL4 - Terminal 2 20°C (68°F) 5.0 to 5.6 Ω

    3. Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

      OK
      Valve moves and makes operating noise.

    OK

    INSPECT TRANSMISSION VALVE BODY ASSEMBLY Click here

    NG

    REPLACE SHIFT SOLENOID VALVE SL4 Click here

  4. INSPECT SHIFT SOLENOID VALVE SLT


    1. A01GNU1E04

      Remove shift solenoid valve SLT Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      Terminal 1 of shift solenoid valve SLT - Terminal 2 20°C (68°F) 5.0 to 5.6 Ω

    3. Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

      OK
      Valve moves and makes operating noise.

    NG

    REPLACE SHIFT SOLENOID VALVE SLT Click here

    OK

  5. INSPECT TRANSMISSION VALVE BODY ASSEMBLY


    1. Check the transmission valve body assembly Click here.

      OK
      There are no foreign objects on any valve.

    NG

    REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY Click here

    OK

  6. INSPECT TORQUE CONVERTER CLUTCH ASSEMBLY


    1. Check the torque converter clutch assembly Click here.

      OK
      The torque converter clutch operates normally.

    NG

    REPLACE TORQUE CONVERTER CLUTCH ASSEMBLY Click here

    OK

    REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY Click here