Ram B1500, B2500, B3500, 1999-2003

5.9L L6 VIN 6 Auto 8

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Trouble Code: P1597



Speed Control Switch Continuous Low Input

Possible Causes:



S/C On/Off switch is shorted to ground
 
S/C switch (MUX switch) is shorted to ground
 
S/C switch (MUX switch) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1598



A/C Pressure Sensor Circuit High Input

Possible Causes:



A/C pressure Sensor circuit is open or shorted to VREF (5v)
 
A/C pressure Sensor ground circuit is open
 
A/C pressure Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1599



A/C Pressure Sensor Circuit Low Input

Possible Causes:



A/C pressure Sensor circuit is shorted to ground
 
A/C pressure Sensor power circuit is open
 
A/C pressure Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1602



PCM Not Programmed

Possible Causes:



Program the PCM and then retest for this same trouble code
 
PCM has failed
 

Trouble Code: P1603



Powertrain Control Module Internal Dual-Port Ram Communication

Possible Causes:



Fused ignition switch output is missing (off-start-run circuit)
 
PCM is damaged or it has an internal failure
 

Trouble Code: P1604



PCM Internal Dual-Port Ram Read/Write Integrity Failure

Possible Causes:



Fused ignition switch output is missing (off-start-run circuit)
 
PCM is damaged or it has an internal failure
 

Trouble Code: P1607



Powertrain Control Module Internal Shutdown Timer Rationality

Possible Causes:



Fused ignition switch output is missing (off-start-run circuit)
 
PCM is damaged or it has an internal failure
 

Trouble Code: P1652



Serial Communication Link Malfunction

Possible Causes:



TCM cannot communicate with the Instrument Cluster (MIC)
 
TCM cannot communicate with the Powertrain Control Module
 
PCM/TCM is damaged or it has an internal failure
 

Trouble Code: P1681



No Fuel Level Bus Messages

Possible Causes:



Data Bus circuit from BCM to PCM is damaged or it has failed
 
Fuel level Bus message to the PCM is invalid
 
BCM is damaged or has failed
 
PCM unable to communicate with the Body Control Module
 

Trouble Code: P1682



Charging System Voltage Too Low

Possible Causes:



Battery positive or Fused Ignition circuit has high resistance
 
Generator drive belt out-of-adjustment or worn out
 
Generator field circuit has a high resistance condition
 
PCM has failed
 

Trouble Code: P1683



Speed Control Relay Or Driver Circuit Malfunction

Possible Causes:



S/C power supply circuit is open or shorted to ground
 
S/C dump solenoid (servo) is damaged or has failed
 
PCM has failed
 

Trouble Code: P1684



Battery Has Been Disconnected

Possible Causes:



Quick Learn procedure was performed with scan tool
 
TCM battery direct (B+) circuit is open or disconnected
 
TCM power ground circuit is open
 
PCM/TCM was disconnected or it has been replaced
 

Trouble Code: P1685



Smart Key Immobilizer Module Invalid Key

Possible Causes:



A theft attempt may have occurred.
 
Obtain the correct key and attempt to start the vehicle
 
Do a PCM Reset function to clear the code after engine startup
 

Trouble Code: P1686



No SKIM Bus Messages Received

Possible Causes:



Data Bus circuit from MIC to the PCM is damaged or it is open
 
Instrument Cluster is damaged or has failed
 
PCM unable to communicate with the Instrument Cluster
 
PCM has failed
 

Trouble Code: P1687



No Cluster Bus Messages

Possible Causes:



Data Bus circuit from SKIM to PCM is damaged or it is open
 
PCM unable to communicate with the Body Control Module
 
PCM has failed, or the SKIM is damaged or has failed
 

Trouble Code: P1688



Fuel Injection Pump Internal Malfunction

Possible Causes:



Fuel injection pump DTC counter malfunction
 
Fuel injection pump Good Trip counter malfunction
 
Fuel injection pump is damaged or has failed
 
ECM has failed
 

Trouble Code: P1689



No Communication Between ECM & Injection Pump Module

Possible Causes:



Fuel injection pump ground circuit open or has high resistance
 
Fuel injection module wiring harness is damaged or has failed
 
CAN data Bus (+) circuit is open, shorted to ground or to power
 
ECM has failed
 

Trouble Code: P1690



Injection Pump CKP Signal Different Than The CKP Signal

Possible Causes:



DTC counter did not change to (0)
 
Fuel injection module wiring harness is damaged or has failed
 
Fuel injection static timing is incorrect
 
Fuel "sync" circuit is open or shorted to ground
 
ECM has failed
 

Trouble Code: P1691



Fuel Injection Pump Calibration Error

Possible Causes:



Fuel Injection pump error at key "on" or at startup
 
Fuel injection pump is damaged or has failed
 
ECM has failed
 

Trouble Code: P1692



Diagnostic Trouble Code Set In The Companion Module

Possible Causes:



Companion Module detected a problem and set a trouble code in memory
 
ECM has failed
 

Trouble Code: P1693



Diagnostic Trouble Code Set In The ECM

Possible Causes:



PCM has detected a problem and set a trouble code in memory
 
PCM has failed
 

Trouble Code: P1694



No PCM Bus Messages

Possible Causes:



Data Bus circuit connector is damaged, open or it is shorted
 
Data Bus circuit to the PCM is damaged or it is open
 
PCM unable to communicate with the body control module
 
Intermittent wiring or connector problems exist
 
PCM has failed
 

Trouble Code: P1695



No BCM Bus Messages

Possible Causes:



Data Bus circuit from BCM to the PCM is damaged or it is open
 
BCM is damaged or has failed
 
TCM unable to communicate with the TCM
 
TCM has failed
 

Trouble Code: P1696



PCM EEPROM Write Operation Denied/Invalid

Possible Causes:



DRB or scan tool displays a "write" failure occurred
 
DRB or scan tool displays "write" refused a second time
 
DRB or scan tool displays SRI mileage invalid (compare the SRI mileage reading to the reading on the odometer)
 
PCM has failed
 

Trouble Code: P1697



PCM Failure (EMR/SRI Mileage Not Stored)

Possible Causes:



Clear the trouble codes and retest for the same trouble code. If DTC P1697 resets, replace the PCM and then reprogram it.
 

Trouble Code: P1698



No CCD Messages Received From The TCM

Possible Causes:



CCD data Bus circuit is open, shorted to ground or to power
 
TCM or the PCM has failed
 

Trouble Code: P1715



A/T Pulse Generator Assembly Circuit Malfunction

Possible Causes:



Pulse generator positive (+) circuit is open or shorted to ground
 
Pulse generator negative (-) circuit is open or shorted to ground
 
Pulse generator is damaged or has failed
 

Trouble Code: P1716



Bus Communication Failure With The PCM

Possible Causes:



CCD data Bus circuit is open, shorted to ground or to power
 
Extremely low battery (system) voltage
 
TCM or the PCM has failed
 

Trouble Code: P1717



Bus Communication Failure With The MIC

Possible Causes:



CCD data Bus circuit is open, shorted to ground or to power
 
Extremely low battery (system) voltage
 
MIC or the TCM has failed
 

Trouble Code: P1738



A/T High Temperature Operation Activated

Possible Causes:



Engine Cooling Fan System is not operating properly
 
Engine cooling fan has failed
 
ATF oil level is too high (overfilled)
 
Transmission oil cooler capacity too low, or cooler is plugged
 
TCM or the PCM has failed
 

Trouble Code: P1739



A/T Power Up Circuit At Speed

Possible Causes:



Fused Ignition power circuit is open between TCM and PCM
 
TCM Power UP circuit is open (test power from PDC or Fuse)
 
TCM Power UP circuit is grounded (test power from PDC or
 
TCM or the PCM has failed
 

Trouble Code: P1740



TCM Internal Malfunction

Possible Causes:



ATF fluid is burnt, contaminated or contains excessive debris
 
A/T cooler flow restriction or problems in the oil pump shaft
 
Internal transmission problem (O/D clutch seals or valve body)
 
Overdrive clutch or TCC clutch is damaged or has failed
 
Transmission valve body is leaking, damaged or has failed
 

Trouble Code: P1756



A/T Governor Pressure Not Equal To Target At 15-20 PSI

Possible Causes:



Check for the presence of other A/T related trouble codes
 
Governor pressure Sensor is damaged or has failed
 
Governor pressure Sensor VREF (5v) circuit is open or shorted
 
Transmission valve body is leaking, damaged or has failed
 
PCM has failed
 

Trouble Code: P1757



A/T Governor Pressure Above 3 PSI In Gear At 0 MPH

Possible Causes:



Check for the presence of other A/T related trouble codes
 
Governor pressure Sensor is damaged or has failed
 
Governor pressure Sensor VREF (5v) circuit is open or shorted
 
Transmission valve body is leaking, damaged or has failed
 
PCM has failed
 

Trouble Code: P1762



A/T Governor Pressure Sensor Offset Volts Too High/Low

Possible Causes:



Governor pressure Sensor VREF (5v) circuit is open
 
Governor pressure Sensor ground circuit is open
 
P/N switch is damaged or has failed (not operating properly)
 
Transmission fluid has excessive debris or it is contaminated
 
PCM has failed
 

Trouble Code: P1763



A/T Governor Pressure Sensor Signal Too High

Possible Causes:



Governor pressure Sensor signal circuit is open
 
Governor pressure Sensor ground circuit is open
 
Governor pressure Sensor signal circuit is shorted to VREF
 
Governor pressure Sensor is damaged or has failed
 
Transmission harness solenoid circuit has a problem
 
PCM has failed
 

Trouble Code: P1764



A/T Governor Pressure Sensor Signal Too Low

Possible Causes:



Governor pressure Sensor signal circuit is shorted to ground
 
Governor pressure Sensor VREF (5v) circuit is open
 
Governor pressure Sensor is damaged or has failed
 
Transmission harness solenoid circuit has a problem
 
PCM has failed
 

Trouble Code: P1765



A/T Transmission Relay Circuit Malfunction

Possible Causes:



Generator power source circuit to relay control circuit is open
 
Transmission relay power circuit is open (check fuse in PCC)
 
Transmission control circuit is open or shorted to ground
 
Transmission relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1767



A/T Transmission Relay Circuit Malfunction

Possible Causes:



Generator power source circuit to relay control circuit is open
 
Transmission relay power circuit is open (check fuse in PCC)
 
Transmission control circuit is open or shorted to ground
 
Transmission relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1768



A/T Transmission Relay Output Always Off

Possible Causes:



2/4 or L/R Solenoid control circuit is open
 
O/D or U/D Solenoid control circuit is open
 
Transmission control relay power circuit is open to Fused B+
 
Transmission control relay is damaged (contacts have failed)
 
TCM has failed
 

 
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