Automatic Transmission
WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
| CONDITION | POSSIBLE CAUSES | CORRECTION |
|---|---|---|
| Harsh N-D Engagement or Harsh N-R Engagement | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Transmission in limp-home mode. | 2. Check TCM for DTCs. Repair as needed. |
| - | 3. Driveline lash/movement. | 3. Check engine mounts, transmission mount, driveshaft couplings, rear crossmember mounts, axle mounts and axle lash. |
| - | 4. Converter clutch or lock up control valve malfunction. | 4. Check for DTCs. Refer to DIAGNOSIS AND TESTING . Inspect valve body for stuck or sticky lock up control valve. If valve motion is free, replace lock up solenoid and retest. |
| - | 5. Valve Body Malfunction. | 5. Inspect valve body for stuck or sticky regulator valve. |
| - | 6. Clutch or planetary component damage. | 6. Remove, disassemble and repair transmission as necessary. |
| - | 7. Water in Trans. | 7. Perform TSB, recommend to split and clean VB if heavily contaminated. |
| DELAYED N-D OR N-R ENGAGEMENT | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Torque converter fluid drain back, delayed soft engagement. | 2. If vehicle moves normally after 3 seconds of shifting into gear, no repair is necessary. If longer, inspect pump for worn bushing. |
| - | 3. Fluid Level Low. | 3. Check and adjust fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE . |
| - | 4. Filter plugged. | 4. Check TC out pressure, if < 10 psi, check for plugged filter. Replace if needed. |
| - | 5. Filter damaged or missing, missing o-ring. | 5. Check for damaged/missing filter or cut/missing o-ring. |
| - | 6. Valve Body Malfunction. | 6. Inspect valve body for stuck/sticky regulator valve or shift group valves. |
| - | 7. Oil pump gears worn/damaged. | 7. Inspect pump for damage or excessive clearances. Replace if needed. |
| NO DRIVE OR REVERSE ENGAGEMENT (vehicle will not move) | 1. Misadjusted/damaged shift cable. | 1. Inspect shift system. Adjust and/or replace worn/damaged parts. |
| - | 2. Fluid level low. | 2. Check and adjust fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE . |
| - | 3. Filter plugged. | 3. Check TC out pressure, if < 10 psi, check for plugged filter. Replace if needed. |
| - | 4. Filter damaged or missing, missing filter o-ring. | 4. Check for damaged/missing filter or cut/missing o-ring. |
| - | 5 Hydraulic system-Low/no line pressure. | 5. Remove Electrohydraulic Unit. Inspect or sticky/stuck regulator valve. If valve motion is free, replace line pressure solenoid and retest. If condition still exists check for worn/damaged pump. Replace pump assembly if needed. |
| - | 6. TCM in Limp Mode | 6. Clear codes and reset. |
| - | 7. Stuck Pressure Regulator Valve | 7. Split Electrohydraulic Unit t and inspect pressure regulator valve. Remove debris if present. Be certain all shift valves are free, if any valve can't be freed replace Electrohydraulic Unit. |
| - | 8. Broken Weld at Front Annulus | 8. Replace Hard Parts as Necessary. |
| - | 9. Broken Input Shaft Weld | 9. Replace Hard Parts as Necessary. |
| - | 10. Defective T/C | 10. Replace T/C, make sure filter is not clogged. |
| - | 11. Broken Output Shaft Weld | 11. Replace parts as necessary |
| - | 12. Broken/Missing Rear Annulus Weld. | 12. Replace parts as necessary. |
| - | 13. Unseated Rear Annulus Gear snap ring. | 13. Properly install or replace snap ring. |
| - | 14. Valves not returned to their home position. | 14. Split Electrohydraulic Unit and inspect 3-4 command valve as well as all other valves, being certain they move freely and are free of debris. |
| SHUDDER GARAGE SHIFT R-D OR D-R | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Customer applying throttle while shift is in progress. | 2. Instruct customer to wait until shift is complete prior to applying throttle. |
| HARSH ROLLING GARAGE SHIFT R-D OR D-R | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Customer shifting into desired range with vehicle motion. | 2. Instruct customer to only shift into the desired range with the vehicle stopped and the service brake applied. |
| - | 3. Transmission in limp-home mode. | 3. Check TCM for DTCs. Repair as needed. |
| ENGINE STALLS | 1. TCC Solenoid Wire in Harness. | 1. Inspect for and repair any short, ground, or open. |
| - | 2. TCC Solenoid Defective, Bent Terminals or Debris Shorting Terminals. | 2. Check for DTCs. Refer to DIAGNOSIS AND TESTING . |
| - | 3. Debris sticking the TCC Solenoid Open. | 3. Remove the TCC Solenoid and try to blow air through it. No air should flow. If air flows freely, replace the TCC Solenoid. |
| - | 4. TCC LU Control Valve Stuck. | 4. Split the Electrohydraulic Unit and inspect the TCC LU valve for any debris. Remove debris if present. If valve can't be freed replace Electrohydraulic Unit. |
| ENGINE STALLS WHEN TRANSMISSION IS SHIFTED INTO R OR D. | 1. Converter clutch or lock up control valve malfunction. | 1. Check for codes. Refer to DIAGNOSIS AND TESTING . Inspect valve body for stuck or sticky lock up control valve. If valve motion is free, replace lock up solenoid and retest. |
| - | 2. Defective torque converter. | 2. Replace torque converter. |
| CLUNK/CLICK NOISE DURING GARAGE SHIFT FROM R-D OR D-R | 1. Stick-slip condition between output flange and output shaft nut upon torque reversal from R to D or D to R. Click on first launch. | 1. Replace output flange and nut. |
| HARSH UPSHIFT OR DOWNSHIFT | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Electrohydraulic Unit malfunction. | 2. Inspect valve body for sticky/stuck valves. Repair as needed. If valve motion is free, replace shift pressure solenoid and line pressure solenoid and retest. |
| - | 3. Damaged or misbuilt clutch. | 3. Remove, disassemble and repair transmission as needed. |
| EMCC SHUDDER AND/OR ROUGH SHIFTS | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Fluid condition, contamination or wrong type. | 2. Change fluid per service information procedures. Refer to FLUID AND FILTER, STANDARD PROCEDURE . |
| - | 3. Electrohydraulic Unit malfunction. | 3. Remove Electrohydraulic Unit. Inspect for sticky/stuck lock up control valve. If valve motion is free, replace the lock up solenoid and retest. |
| - | 4. Defective torque converter. | 4. Replace torque converter. |
| GRATING OR SCRAPING NOISE PROPORTIONAL TO ENGINE SPEED | 1. Torque converter bolts contacting dust shield. | 1. Dust shield bent. Replace if needed. Torque converter bolt backed out. Replace with new bolt and torque to proper level. |
| - | 2. Damaged/broken drive plate. | 2. Inspect driveplate. Replace if needed. |
| GRATING OR SCRAPING NOISE PROPORTIONAL TO TRANSMISSION OUTPUT SPEED | 1. Driveshaft or rear axle noise. | 1. Check driveshaft, center bearing and axle for noise or contact with other components. |
| - | 2. Transmission output bearing noise. | 2. Replace output bearing and retest. |
| - | 3. Internal transmission damage. | 3. Remove, disassemble and repair transmission as needed. |
| HIGH PITCHED WHINE/NOISE RELATED TO ENGINE SPEED | 1. Fluid level low. | 1. Check and adjust fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE . |
| - | 2. Transmission in limp-home mode. | 2. Check TCM for DTCs. Repair as needed. |
| - | 3. Filter plugged. | 3. Check TC out pressure, if < 10 psi, check for plugged filter. Replace if needed. |
| - | 4. Filter damaged or missing. | 4. Check for damaged/missing filter or cut/missing o-ring. |
| - | 5. Oil pump bushing worn/damaged. | 5. Visually inspect for worn or damaged pump bushing. Replace pump assembly if needed. |
| - | 6. Oil pump gears worn/damaged. | 6. Inspect for worn or damaged pump gears. Replace pump assembly if needed. |
| NOISE ONLY IN 1ST OR 5TH GEAR | 1. Broken Tab on K1/K2 Thrust bearing. | 1. Replace K1/K2 Thrust bearing. |
| FLARES ON THE 1 - 2 SHIFT | 1. Failed F1 ORC. | 1. Replace F1 ORC, B1 Retainer and K1 Retainer. |
| - | 2. Stuck 1-2/4-5 valve. | 2. Split Electrohydraulic Unit and inspect 1-2/4-5 valves. Remove debris if present. If valve can't be freed replace Electrohydraulic Unit. |
| BUMPSHIFT ON 2-1 DOWNSHIFT | 1. K1 Belleville retainer snap ring. | 1. K1 Belleville retainer snap rings may become unseated. Disassemble trans and re-seat snap ring. Verify there are no stuck 1-2/4-5 shift valves in the Electrohydaulic unit prior to removing the trans. |
| FLARES ON THE 2-3 SHIFT | 1. K2 Piston Bottomed Out. | 1. Replace Input Shaft Assembly. This issue can be verified by making immediate repeated shifts between 2nd and 3rd. If the flare is eliminated on subsequent shifts to 3rd, It is likely that this is the issue. |
| - | 2. Failed F2 ORC. | 2. Replace F2 ORC, Rear Sun Gear and Front Sun Gear |
| - | 3. Stuck 2-3 Valves. | 3. Split Electrohydraulic Unit and inspect 2-3 valves. Remove debris if present. If valve can't be freed replace Electrohydraulic Unit. |
| - | 4. K2 Clutch Slipping. | 4. Inspect and if damaged replace K2 Clutch Discs and Seals. |
| - | 5. 2-3 Shift Pressure Valve Spring Deformed. | 5. It is possible that when the steel cover plate was screwed to the Electrohydraulic Unit, the spring was pinched thus deforming the bore and sticking the valve. Remove the Electrohydraulic Unit and remove the steel plate covering the 2-3 shift pressure valve. If the valve can't be freely removed from the bore, the spring was pinched and the Electrohydraulic Unit requires replacement. |
| - | 6. B1 bushing missing. | 6. Replace B1 retainer and input shaft. |
| SLIPS ON 2-3 UPSHIFT | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Fluid level low. | 2. Check and adjust fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE . |
| - | 3. Filter damaged or missing. | 3. Check for damaged/missing filter or cut/missing o-ring. |
| - | 4. Valve body malfunction. | 4. Check for sticky/stuck 2-3 shift pressure valve or regulator valve. |
| - | 5. F2 or B2 clutch damaged. | 5. Disassemble transmission, inspect for damaged F2 or B2 clutch. Repair as needed. |
| FLARE OR NEUTRALS ON THE 3-4/4-3 SHIFT | 1. Debris sticking the 3-4 Holding Valve | 1. Split Electrohydraulic Unit and remove the 3-4 Shift Pressure and 3-4 Holding Valves. Flush the valves and bores with a solvent such as mineral spirits. (Note: Debris can be a very small sliver unnoticable unless flushing onto filter paper.) Only if the valve can not be freed should the Electrohydraulic Unit be replaced. |
| - | 2. Debris Sticking the 3-4 Shift Pressure Valve | 2. Split Electrohydraulic Unit and remove the 3-4 Shift Pressure and 3-4 Holding Valves. Flush the valves and bores with a solvent such as mineral spirits. (Note: Debris can be a very small sliver unnoticable unless flushing onto filter paper.) Only if the valve can not be freed should the Electrohydraulic Unit be replaced. |
| - | 3. Two Plastic Check Balls in one pocket. | 3. Split the Electrohydraulic Unit and inspect and verify that there is only one plastic check ball in each of the 4 pockets. If there are two in any pocket, remove one and reassemble. |
| SLIPS, BANGS INTO GEAR, DELAYED ENGAGEMENT, VENT TUBE LEAK | 1. Casting Void in the Bell Housing. | 1. Disassemble the transmission, remove the pump and gears from the bell housing. Inspect the pump gear face in the bell housing for a 3/16" diameter void between the pump suction and drainback circuits. If void is present, replace the bell housing. |
| SLIPS ON 3-4 UPSHIFT | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Fluid level low. | 2. Check and adjust fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE . |
| - | 3. Filter damaged or missing. | 3. Check for damaged/missing filter or cut/missing o-ring. |
| - | 4. Valve body malfunction. | 4. Check for sticky/stuck 3 - 4 shift pressure valve or regulator valve. |
| - | 5. K3 or B2 clutch damaged. | 5. Disassemble transmission, inspect for damaged K3 or B2 clutch. Repair as needed. |
| SLIPS ON 4-5 UPSHIFT | 1. Transmission adaptation/calibration. | 1. Check for latest level TCM software. Perform the TCM adaptation procedure. (Refer to MODULE, TRANSMISSION CONTROL ) |
| - | 2. Fluid level low. | 2. Check and adjust fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE . |
| - | 3. Filter damaged or missing. | 3. Check for damaged/missing filter or cut/missing o-ring. |
| - | 4. Electrohydraulic Unit malfunction. | 4. Check for sticky/stuck 1 -2/4- 5 shift pressure valve or regulator valve. |
| - | 5. B1 or K1 clutch damaged. | 5. Disassemble transmission, inspect for damaged B1 or K1 clutch. Repair as needed. |
| IN-GEAR SHUDDER ON HEAVY ACCELERATION | 1. Fluid level low. | 1. Check and adjust fluid level. Refer to FLUID AND FILTER, STANDARD PROCEDURE . |
| - | 2. Filter damaged or missing. | 2. Check for damaged/missing filter or cut/missing o-ring. |
| NO DRIVE ENGAGEMENT FOLLOWING A SHIFT TO N | 1. Customer shifting into N at vehicle speeds greater than 25 mph and tipping in on the throttle. | 1. Instruct the customer that they should not shift into N at vehicle speeds greater 25 mph. |
| - | 2. Shift system malfunction. | 2. Inspect shift system for proper adjustment or damage. Check shifter for DTCs. Repair as needed. |
| REVERSE GEAR POSITION BLOCKED ENGAGEMENT WHEN MOVING SHIFT LEVER FROM D POSITION | 1. Customer shifting into R at vehicle speeds greater than 7 mph. | 1. Instruct customer that R shifter position is blocked at vehicle speeds greater than 7 mph. |
| - | 2. Shift system malfunction. | 2. Inspect shift system for proper adjustment or damage. Check shifter for DTCs. Repair as needed. |
| NO ENGINE CRANKING IN P OR N | 1. Gearshift cable adjustment. | 1. Adjust shift cable and retest. |
| - | 2. Shift system malfunction. | 2. Check shifter DTCs. Inspect shift cable and lever assembly. Adjust and/or replace worn/damaged parts. |
| - | 3. Valve body malfunction. | 3. Starter lockout contact malfunction. Remove valve body, replace lead frame assembly. Refer to CONTACT, TEMPERATURE SENSOR\PARK-NEUTRAL, OPERATION . |
| INCORRECT TRANSMISSION TEMPERATURE | 1. Defective Trans Temp Sensor. | 1. Verify proper temperature sensor operation. |
| SPEED SENSOR ERROR | 1. Loose/Corroded TCM Connector (Both C1 and C2 Connectors). | 1. Disconnect, inspect, and reconnect TCM connector. Make sure to check for any pushed out pins. |
| - | 2. Unlatched Electrohydraulic Unit connector. | 2. Remove the Electrohydraulic Unit connector and inspect for any oil or damaged pins. (Note: There is no Electrohydraulic Unit connector pin in position #5) Reattach the connector and insure that the locking ring tab is fully latched. |
| - | 3. Wires Shorted or Open. | 3. Ohm the speed sensor wires to make sure there is not a short to another circuit or ground. Visually inspect for any chafing of the wires. Repair as necessary. |
| - | 4. TCM Defective. | 4. After checking the wiring and connectors replace the TCM. |
| FLUID LEAK | 1. Leak in area of bell housing. | 1. Check bolt torque on internal bell housing bolts. If loose, replace fastener and torque to proper level. If bolts are to proper torque level, check pump outer seal and impeller seal. Replace if needed. |
| - | 2. Leak in area of control unit (valve body) electrical connector. | 2. Check connector for damaged (cut), flattened or missing o-rings. Replace as needed. |
| - | 3. Leak in area of pan gasket. | 3. Check for proper torque on oil pan clamps. Check for mispositioned or rolled gasket. Repair as needed. |
| - | 4. Leak in area of park guide plug. | 4. Remove park guide plug. Check for damaged (cut) or missing o-ring. If o-ring is in good condition, install new plug. |
| - | 5. Leak in area of shift lever. | 5. Check for damaged shift lever seal or damaged lever. Repair as needed. |
| - | 6. Leak in area of output flange. | 6. Check for worn/damaged slinger seal and output seal. Visually inspect output flange seal surface for damage. Repair as needed. |
| - | 7. Leak in area of transmission vent. | 7. Check fluid level for overfill condition. Adjust as needed. If fluid level is within specification, ride check vehicle. Monitor transmission temperature. If high operating temperatures are observed, fluid may be contaminated or cooling system malfunctioning. Change fluid per service information procedures. if needed. Refer to DIAGNOSIS AND TESTING . |
| - | 8. Leak in area of transmission fill tube. | 8. Inspect fill tube cap for proper installation. Inspect fill tube grommet between case and fill tube for leakage. Repair as needed. |