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Home >> Chrysler >> 2001 >> Sebring Convertible V6-2.7L VIN U >> Repair and Diagnosis >> Transmission and Drivetrain >> Transmission Control Systems >> Description and Operation >> Diagnostic Trouble Codes >> DTC Descriptions >> Part 2 of 2

Part 2 of 2

Name of code: P-0750 (41) - L-R Solenoid Circuit P-0765(42) - 2-4 Solenoid Circuit P-0760(43) - OD Solenoid Circuit P-0765(44) - UD Solenoid Circuit.
When monitored: Ignition key is turned from off position to run position and/or ignition key is turned from crank position to run position, then every 10 seconds thereafter, or when a speed ratio or pressure switch error DTC is detected
Set condition: All four solenoids are tested for continuity continuously immediately upon start up and during vehicle operation. For solenoids that are currently energized, power is momentarily interrupted, then reenergized. For solenoids that are not currently energized, the solenoid is momentarily energized, then deenergized. Under both situations, if an inductive spike is not sensed by the Transmission Control Module (TCM) during the continuity check, it is retested twice. If it fails the test the third time, the appropriate code is set.





Theory of operation: Four solenoids are used to control the friction elements (clutches). The continuity of the solenoids circuits are periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the TCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a speed ratio or pressure switch error occurs. In this case, one failure will result in the appropriate code being set.
Transmission Effects: The MIL will illuminate and the transmission goes into neutral if code is set above 22 MPH, limp-in mode when vehicle speed is below 22 MPH.
Possible causes:
> Open or shorted solenoid circuit(s) between TCM and solenoid pack
> Open ground circuit.
> TCM connector problems
> Solenoid pack connector problem.
> Solenoid Pack
> TCM

Name of code: P-1776 (47) - Solenoid Switch Valve (SSV) Latched in L-R Position
When monitored: Continuously when doing partial or full EMCC (PEMCC or FEMCC)
Set condition: If the transmission senses the L-R pressure switch closing while performing PEMCC or FEMCC. This code will be set after two unsuccessful attempts to perform PEMCC or FEMCC.
Theory of operation: The solenoid switch valve (SSV) controls the direction of the transmission fluid when the L-R/TCC solenoid is energized. SSV will be in the downshifted position in 1st gear, thus directing the fluid to the L-R clutch circuits. In 2nd, 3rd, and 4th, the SSV will be in the upshifted position and directs the fluid into the torque converter clutch (TCC).
When doing PEMCC or FEMCC, the L-R pressure switch should indicate no pressure if the SSV is in the TCC position. If the L-R pressure switch indicates pressure while in PEMCC or FEMCC, EMCC operation is aborted and inhibited to avoid inadvertent application of the L-R clutch. Partial EMCC will be attempted if the L-R pressure switch does not indicate pressure. A second detection of L-R pressure results in setting the code.
Transmission Effects: At speeds above 45 MPH, EMCC is inhibited. Once speed falls below 45 MPH, the transmission will to into relay open limp-in mode and the MIL will illuminate.
Possible causes:
> Valve body - Solenoid valve stuck in L-R position
> Intermittent short to ground or open circuit in L-R Pressure Switch Sense circuit (with code 24 only)
> Solenoid pack (with code P-1784 (24) only)
> TCM (with code P-1784 (24) only)

Name of code: P-1793 (48) - Torque Reduction (TRD) Link Communication Error
When Monitored: Whenever the engine is running
Set condition: This code is set when the TCM sends multiple torque reduction messages to the PCM and the TCM does not receive a response from the PCM. MIL may illuminate on some engines.
Theory of Operation: During high torque shifts the TCM will send a message requesting that the PCM reduce engine power until the shift is completed. This message is sent from the TCM to the Powertrain Control Module across the Torque Management Request Sense Circuit. The PCM will acknowledge the TCM request by sending a message across the PCI bus within a specific amount of time. The TRD Link communication is also tested periodically for operation whenever the engine is running and the vehicle is not moving with zero degrees throttle.
Transmission Effects: Maximum throttle angle used by TCM will be 54 degrees. As a result a customer may complain about loss of performance or of short shifting when driving aggressively.
Possible Causes:
> Sticky Throttle Position Sensor (TPS)
> Wiring or Connector problems in the Torque Management Request Sense Circuit
> PCM
> TCM

Name of code: P-0736 (50) - Gear Ratio Error in Reverse
P-0731 (51) - Gear Ratio Error in 1st
P-0732 (52) - Gear Ratio Error in 2nd
P-0733 (53) - Gear Ratio Error in 3rd
P-0734 (54) - Gear Ratio Error in 4th
P-0715 (56) - Input Speed Sensor Error
P-0720 (57) - Output Speed Sensor Error
P-1794 (58) - Speed Sensor Ground Error
When monitored: The transmission gear ratio is monitored continuously while the transmission is in gear.
Set condition: This code is set if the gear ratio is not correct for a period of time.
- Codes 50 through 54 sets if the ratio of the input RPM (Nt) to the output RPM (No) does not match the given gear ratio.
- Code 56 sets if there is an excessive change in input RPM in any gear
- Code 57 sets if there is an excessive change in output RPM in any gear
- Code 58 sets after a TCM reset in neutral and Nt/No equals a ratio of input to output of 2.50
A hard code sets within 3 seconds, an intermittent code sets within 15 seconds.
Theory of operation: The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks:
1. When in gear, if the gear ratio does not compare to a known gear ratio, the corresponding in-gear trouble code is set (codes 50 through 54).
2. An excessive change in input or output speeds indicating signal intermittent will result in codes 56 and/57 being set.
3. After a TOM reset in neutral, observing erratic output and input speed sensor signals indicates a loss of the common speed sensors ground. This sets a code 58.
Transmission Effects: The transmission will not go into relay open limp-in mode until three gear ratio error events occur in a given key start. This allows for intermittent problems to correct themselves without opening the relay. However, if a gear ratio error develops, a code is always set, but if the condition corrects itself the transmission will continue without requiring the ignition key to be cycled on and off. Many different events could occur given the range of failures possible for codes 50 through 58. The following are a few examples:
- Codes 51, 52, 53, 54, 56, and 57 (at speeds above 45 MPH) - The appropriate code is set, EMCC is aborted and current gear is maintained. If while still traveling above 45, the gear ratio becomes valid again, EMCC will reengage and normal operation will resume. If the gear ratio becomes intermittent and recovers three times in a given key start, the current gear will be maintained and EMCC inhibited, then the transmission will go into relay open limp-in mode if throttle is applied below 45 MPH or at 22 MPH with closed throttle.
- Codes 51, 52, 53, 54, 56, and 57 (at speeds between 22 and 45 MPH) - If one of these codes is set between 22 and 45 MPH, the current gear will be maintained until the gear ratio problem corrects itself. If throttle is applied, the bans will go to 2nd gear. If this happens and the gear ratio problem goes away, normal operation will resume. If three gear ratio problems are identified in a given key start, the current gear will be frozen until throttle is applied. The transmission will then go into relay open limp-in mode and throttle applied at speeds between 22 and 45 MPH.
- Codes 51, 52, 53, 54, 56, and 57 (at speeds below 22 MPH) - If a gear ratio problem is identified below 22 MPH, the transmission will immediately substitute second gear for the current gear. If the gear ratio problem goes away, normal operation will resume. If three gear ratio problems are identified in a give key start, the transmission will go into relay open limp-in mode.
Possible causes: Code P-0736 (50) - excludes geartrain failures which should be obvious upon disassembly
> If code P-1791 (35) is also set, follow diagnostic procedure for code P-1791 (35) first
> Valve body - #1 ball check or LR switch valve sticking - may also set code P-0731 (51)
> Speed sensor or associated wiring - may also set codes P-0731 (51), P-0716 (56), or P 0720 (57)
> Failed or slipping LR clutch - may also set code P-0731 (51)
- LR seal leakage (Intermittent no drive or reverse)
- Sticky LR accumulator seals (Intermittent no drive or reverse)
> Failed reverse clutch (hard code) - OD/Rev lip seal leakage - Worn reaction shaft support seal rings - Snap ring out of position
Code P-0731 (51)-Excludes geartrain failures, which should be obvious upon disassembly
> If code P-1791 (35) is also set, follow diagnostic procedure for code P-1791 (35) first
> Valve body-#1 ball check or LR switch valve sticking - may also set code P-0736 (56) or have no Reverse
> Speed sensor or associated wiring - may also set codes P-0736 (50), P-0715 (56), or P 0720 (57)
> Failed or intermittent slipping UD clutch -may also set P-0732 (52), or P-0733 (53)
- UD seal leakage (intermittent)
- Worn input clutch hub bushing (hard code at heavy throttle)
- Sticky UD accumulator seals (intermittent) - Worn reaction shaft support seal rings (hard code at heavy throttle)
- Solenoid pack (UD pressure in 4th gear)
> Failed or slipping LR clutch - may also set code P-0736 (56) or have no Reverse
- LR seal leakage (Intermittent)
- Sticky LR accumulator seals (Intermittent)
Code P-0732 (52) - Excludes geartrain failures which should be obvious upon disassembly
> If code P-1791 (35) is also set, follow diagnostic procedure for code P-1791 (35) first
> Failed or slipping 2-4 clutch - may also set code P-0734 (54)
- Sticky accumulator seals (intermittent)
> Failed or intermittent slipping UD clutch -may also set code P-0731 (51) and/or P 0733(53)
- UD seal leakage (intermittent)
- Worn input clutch hub bushing (hard code at heavy throttle)
- Sticky UD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Solenoid pack (UD pressure in 4th gear)
Code P-0733 (53) - Excludes geartrain failures, which should be obvious upon disassembly
> If code P-1791 (35) is also set, follow diagnostic procedure for code P-1791 (35) first
> Failed or slipping OD clutch - may also set code P-P0734 (54)
- OD and Reverse inner and outer lip seal leakage (usually hard code)
- Sticky OD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Broken OD/UD tapered snap ring - (hard code at heavy throttle)
> Failed or intermittent slipping UD clutch -may also set code P-0731 (51) and/or P-0732 (62)
- UD seal leakage (intermittent)
- Worn input clutch hub bushing (hard code at heavy throttle)
- Sticky UD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Solenoid pack (UD pressure in 4th gear)
Code P-0734 (64) - Excludes geartrain failures which should be obvious upon disassembly
> If code P-1791 (35) is also set, follow diagnostic procedure for code P-1791 (35) first
> Failed or slipping OD clutch - may also set code P-0733 (53)
- OD and Reverse inner and outer lip seal leakage (usually hard code)
- Sticky OD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Broken OD/UD tapered snap ring - (hard code at heavy throttle)
> Failed or slipping 2-4 clutch - may also set code P-0732 (52)
- 2-4 seal leakage (intermittent)
- Sticky accumulator seals (intermittent)
Codes P-0715 (56) and P-0720 (57)
> Failed input or output speed sensor (intermittent or hard code)
> Shorted or open wiring between TCM and speed sensor(s) (intermittent)
> Connector problems at 60 TCM connector and/or speed sensor connector
Code P-1794 (58)
> Open or shorted speed sensor ground (speed sensor ground is different from chassis ground)
> Open or shorted Temperature Sensor wiring to TRS
> TRS - Will also set code P-1799 (74)
> TCM

Name of code: 70-Autostick Sensor Circuit
When monitored: Whenever the engine is running.
Set condition:
1) The transmission shift lever is not in AutoStick and either the upshift or downshift switches are closed.
2) Both the upshift and downshift switches are closed at the same time.
Theory of operation: In the AutoStick Mode (manual shift mode), upshifts and downshifts are actuated manually. Shift requests are detected by monitoring the upshift and downshift switches. The Transmission Control Module (TCM) monitors the above set conditions. A set condition will be tolerated for up to 15 seconds before setting a code.
Transmission Effects: The OD position shift schedule is substituted while operating in the Autostick gear selector position. No limp-in mode occurs.
Possible causes:
> Wiring or connector problems
> AutoStick switch failure
> TCM

Name of code: P-1797 (71)-Manual Shift Overheat
When monitored: Whenever the engine is running.
Set condition:
1) If the engine temperature exceeds 255�F while operating in AutoStick mode.
2) If the transmission temperature exceeds 275�F while in AutoStick mode
Theory of operation: Transmission and engine temperatures are monitored during vehicle operation. If conditions occur causing the engine or transmission to overheat, the AutoStick mode will be canceled, and a code will be set.
Transmission Effects: The 3 position shift schedule that is used in non-AutoStick applications is substituted while operating in the AutoStick gear selector position. No limp-in mode occurs.
Possible causes:
> Engine overheat - refer to service manual for diagnosis and repair
> Transmission Overheat - Restricted transmission cooling system - Transmission fluid overfilled - Radiator fan not functioning properly - Extended driving in low gear

Note: Strenuous driving conditions may cause the vehicle to overheat. If the driver operates in or initiates AutoStick with an overheated vehicle, the code will be set.

Name of code: P-1798 (73)-Deteriorated Transaxle Fluid
When monitored: At every Fully Electronically Modulated Converter Clutch (FEMCC) to Partial Electronically Modulated Converter Clutch (PEMCC) transition miles when A/C compressor clutch is being cycled.
Set condition: The code will be set if vehicle shudder is detected 20 times when the A/C clutch is cycled.
Theory of operation: While in 3rd or 4th gear FEMCC and just before the A/C clutch engages, the Powertrain Control Module (PCM) requests the Transmission Control Module (TCM) to momentarily establish PEMCC operation. If vehicle shudder is detected during the FEMCC to PEMCC transition, a counter is incremented. If the count reaches 20, the trouble code is set. The driver may then notice harsh bumps when the A/C clutch is being cycled, but vehicle shudder will be eliminated. After 35 OBDII warm-up starts or if the code is cleared, PEMCC will be reactivated to see if shudder is still present. If one shudder event occurs, the code will be reset. Clearing the code and running battery disconnect with the DRBIII is the only way to reset the shudder counter from 20 back to zero.
Transmission Effects: This code does not cause the transmission to go into limp-in mode. However, once the code is set, FEMCC to PEMCC operation before the A/C clutch engagement will be disabled for 35 OBDII warm up starts.
Possible causes:
> Degraded transmission fluid
> Wheels severely out of alignment
> Internal torque converter problem

Name of code: P-1799 (74)-Calculated Oil Temperature in Use
When monitored: Whenever the Engine is running.
Set condition: The code is set if any of the following conditions exist for three consecutive key starts:
> The Temperature Sensor voltage is out of range (below 0.07 volts or greater than 4.94 volts)
> If continuous erratic Temperature Sensor voltage is sensed.
> The Temperature Sensor temperature stays below 80�F for an extended period of time.
Theory of operation: The TCM uses a Temperature Sensor to monitor the transmission sump temperature. This temperature is used to determine which shift schedule the TCM is to use. (See Transmission Operation and Shift Scheduling at Various Sump Temperatures in this diagnostic manual.) If the Temperature Sensor circuit fails to operate properly the TCM will use the calculated oil temperature routine found in prior model year TCM. If this occurs for three consecutive key starts, the code will be set. The TCM will then test the Temperature Sensor circuit after every 35 OBDII warm-up starts. If the Temperature Sensor circuit is OK, the Temperature Sensor data is used in place of the Calculated Oil Temperature data.
Transmission Effects: If the Temperature Sensor indicates a temperature below 0�F or above 240�F at start up, the TCM compares the calculated oil temperature to the indicated Temperature Sensor oil temperature. If the calculated oil temperature differs significantly from the Temperature Sensor value, the calculated oil temperature will be used for that key start.
Possible causes:
> Wiring or Connector problems in the transmission temperature sensor signal circuit.
> TRS
> TCM

Name of code: P-1738 (75)-High Temperature Operation Activated.
When monitored: Whenever the engine is running:
Set condition:
Immediately once the Overheat Shift Schedule is activated.
Theory of operation: If the transmission oil temperature rises above 240�F, the overheat shift schedule is activated refer to Transmission Operation as a function of Transmission Oil Temperature and the code is set. The DTC is an information code only and is being set to aid the technician in determining root cause of a customer driveability issue. The code is also intended to alert the technician to determine if a cooling system malfunction has occurred or if an additional transmission air to oil cooler should be added to the vehicle if the customer regularly drives a manner that overheats the transmission. Extended operation above 240�F will reduce the durability of the transmission and should be avoided. Correcting the cooling system malfunction or installing an additional transmission oil cooler will improve transmission durability especially for customers who operate in city/ construction stop and go traffic, tow trailers regularly, drive aggressively in low gear or drive regularly in mountainous areas.
Transmission Effects: Information only code. -Overheat shift schedule was activated, no limp-in condition occurs. 2nd gear partial EMCC above 25 MPH, 3rd gear EMCC from 28-43 MPH delayed 3-4 upshift at 43 MPH, early 4-3 coastdown at 41 MPH, EMCC operation under all conditions about 25 MPH except at closed throttle or 1st gear.
Possible Causes:
- Transmission Overfilled with Oil - Engine cooling fan failure
- Engine thermostat stuck closed
- Radiator corroded or packed with dirt - Transmission Oil Cooler Plugged
- Customer driving pattern requires additional transmission cooling (See Theory of Operation for typical driving patterns that can cause overheating)

Name of code: P1739 (76) - Power-Up at Speed
When Monitored: When TCM (transmission control module) initially powers-up.
Set Condition: If the TCM powers up while in the "Drive" position and the vehicle is going above 20 MPH, the code is set.
Theory of Operation: If a vehicle loses power to the TCM, the vehicle will go to the 2nd gear mode since there is no power available to control the transmission solenoids. However if power is restored, the TCM will power-up and normal operation will be restored. This DTC identifies that power to the TCM was restored when the gear selector was in a "Drive" position while the vehicle was moving at speeds above 20 MPH. If a person shifts to Neutral and cycles the ignition key and quickly shifts to "Drive" while moving before the TCM comes out of its START ROUTINE, the DTC can be set. Therefore it is critical that this DTC diagnosis repair procedure should only be used if the vehicle is experiencing intermittent 2nd gear operation and subsequently a return to normal operation during normal driving.
Transmission Effects: No limp-in condition. The DTC is for information only when trying to diagnose intermittent 2nd gear operation and subsequently a return to normal operation.
Possible Causes:
- No Problem if vehicle is started in "neutral" at speeds above 20 MPH and shifted quickly to "Drive" before TCM comes out of the START ROUTINE.
FOR INTERMITTENT 2ND GEAR OPERATION AND THEN A SUBSEQUENT RETURN TO NORMAL OPERATION WITHOUT CYCLING THE IGNITION KEY
- Intermittent Direct Battery connection between TCM (60-way pin 56) and battery.
- Intermittent Fused Ignition Switch Output between TCM (60-way pin 11) and ignition switch. - Intermittent Ground to TCM (60 way pins 53 and 57).

Name of code: P1717 (77) - No Communication with Mechanical Instrument Cluster (MIC)
When monitored: Continuously with key on.
Set condition: If no PCI bus messages are received from the Mechanical Instrument Cluster (MIC) for 25 seconds.
Theory of Operation: The TCM communicates with the MIC using the PCI bus. It relies on certain information to function properly. The TCM continuously monitors the PCI bus to check for messages broadcast from the PCM.
Transmission Effects: Possible improper TCM AutoStick configuration.
Possible Causes:
> Open or shorted PCI bus circuit from MIC
> MIC
> TCM (If other communications codes are stored in the TCM only)

Name of Code: P-0600 (78) - Serial Communication Link Malfunction
When Monitored: Continuously with key on.
Set condition: If no PCI bus messages are received by the Transmission Control Module (TCM) for 10 seconds.
Theory of Operation: The TCM communicates with the other modules in the vehicle using the PCI bus. It relies on certain information to function properly. The TCM continuously monitors the PCI bus to check for messages broadcast from the certain modules.
Transmission Effects: Possible improper TCM AutoStick configuration and delayed 3-4 shifts. No EMCC and early 3-4 shifts for a few minutes after engine is started.
Possible causes:
> Opened or shorted PCI bus circuit from BCM
> TCM

Name of Code: P-1714 (79) Low Battery Voltage
When Monitored: Continuously with engine running and Transmission Relay energized.
Set condition: If the voltage sensed at the Transmission Control Relay Output circuit (pins 16 and 17 at TCM) for 15 seconds.
Theory of Operation: The Transmission system requires sufficient battery voltage in order to energize the transmission solenoids. The TCM continuously monitors the voltage available to the solenoids.
Transmission Effects: At speeds above 45 MPH the transmission system will default to neutral. Below 45 MPH the transmission system will default to relay open limp-in mode. Park, Reverse, and Neutral are still available.
Possible causes:
> Charging system problem
> Poor/High resistance connection between TCM and Battery/Alternator
> TCM pin 16 and 17 high resistance or poor connection
> TCM ground pins 53 and 57 high resistance or poor connection
> High resistance in Transmission Control Relay contacts
> TCM
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