Fix U0404 and TSB 21-016-06 on Jeep
What is U0404
Chrysler has issued TSB 21-016-06 to address a U0404 trouble code on the vehicles listed below. The code is defined as: U0404-IMPLAUSIBLE DATA RECEIVED FROM ESM. You may also see a P0607 trouble code set. The ESM is the electronic shift module (shifter mechanism). The ESM sends digital data on the CAN digital buss to the transmission control module (TCM) to tell it you’ve selected a gear. The U0404 code sets when the TCM detects an incorrect digital signal from the ESM or there’s a problem with the front control module (FCM) or the TCM.
Prior to this TSB 21-016-06, the only fix was to replace the entire ESM . Now Chrysler is making replacement parts available.
Models affected by TSB 21-016-06
2005 – 2007 (WK) Grand Cherokee
2005 – 2007 (WH) Grand Cherokee (International Markets)
2006 – 2007 (XK) Commander
2006 – 2007 (XH) Commander (International Markets)
Fix for U0404
1.Set the parking brake and move shifter to neutral
2. Remove center floor console using the procedures outlined in shop manual
3. Remove shifter Knob and trim mat.
Turn lower chrome ring of shift knob counter clockwise 90°. Pull the knob and the chrome ring off from the lever. Then, using trim stick, remove the trim mat.
1 – SHIFTER BEZEL SCREWS
2 – RUBBER MAT
3 – TRANSFER CASE SWITCH (IF EQUIPPED)
4 – TRANSFER CASE SWITCH SCREWS ON BOTTOM
5 – SHIFTER KNOB
6 – BEZEL WIRING CONNECTOR
4. Then remove Remove The Shifter Bezel. To do that, first disconnect the shifter bezel wiring connector. Then remove the torx bit screws using a TX20 bit. Remove the two bottom screws for Transfer Case (TC) switch using torx bit, and disconnect the TC wiring connector (only on some models). Lift the shifter bezel upwards while making sure the solenoid wiring connector remains in place. You may have to remove the heat duct by pulling to the side to get access to the TC switch screws.
1 – SOLENOID CONNECTOR **PINS**
2 – SLIDER GUIDE AREA REQUIRING REMOVAL
3 – SHAPE OF SLIDER GUIDE AFTER TRIMMING
4 – UTILITY KNIFE/BOX CUTTER
Remove the Trim Slide Guides
Locate slide guides at the rear of the shifter. Then use a box cutter to trim to a smooth transition to the base of the shifter housing.
Reinstall the shifter bezel
Ensure the solenoid connector is seated in the shifter housing and make sure that the connector pins of the interface in the bezel and the wiring connector are both upright and aligned prior to shifter bezel installation. Then align the transportation tube onto the top of the shifter lever, lower the new shifter bezel onto the shift lever and discard the tube. Next, position the shifter bezel on the shifter housing and connector and install the screws in the bin and at the housing. Torque the screws to 1.5 – 2.1 Nm (13.5 – 18.5 in. lbs.).
If equipped, install the TC switch with two screws from the bottom, torque the screws to 0.89 – 1.11 Nm (7.8 – 9.8 in. lbs.). Connect the wiring connector to TC switch. Connect the wiring connector to the shifter bezel.
Ensure cable routing does not interfere with slide guides and slider exit. Install Shift Knob And Trim Mat.
Verify that shifter is in the neutral position
Position knob with chrome ring on lever and seat fully.
Turn lower chrome ring of shift knob clockwise 90°.
Place the trim mat into shifter bezel bin.
Verify the brake transmission shift interlock operation
Verify that the key can only be removed in the PARK position. When the shift lever is in PARK, the ignition key cylinder should rotate freely from ACC to LOCK. When the shifter is in any other gear or neutral position, the ignition key cylinder should not rotate to the LOCK position.
Shifting out of PARK should not be possible when the ignition key cylinder is in the ACC position and the brake pedal is not depressed.
Shifting out of PARK should not be possible while applying normal force on the shift lever and ignition key cylinder is in the ACC, ON, or START positions unless the foot brake pedal is depressed approximately 12mm (1/2 in.).
Shifting out of PARK should not be possible when the ignition key cylinder is in the LOCK position, regardless of the brake pedal position.
Shifting between any gears, NEUTRAL or into PARK may be done without depressing foot brake pedal with ignition switch in ACC, ON, or START positions.
Install the center floor console using the procedures outlined in the shop manual
Part numbers to fix U0404
AR (1) 68004143AC Bezel, Shifter, with A580 Transmission and without Transfer Case Switch
AR (1) 68004144AC Bezel, Shifter, with A580 Transmission and Transfer Case Switch
AR (1) 68004145AC Bezel, Shifter, with 545RFE Transmission and without Transfer Case Switch
AR (1) 68004146AC Bezel, Shifter, with 545RFE Transmission and Transfer Case Switch
©, 2019 Rick MuscoplatPosted on by Rick Muscoplat