Dakota, 2001-2005

3.9L V6 VIN X Auto 5

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Trouble Code: P0751



A/T Overdrive Switch Pressed Low For Over 5 Minutes

Possible Causes:



Overdrive Switch Off" circuit is shorted to ground
 
Overdrive Switch is damaged or has failed
 
PCM has failed
 

Trouble Code: P0753



A/T 3-4 Solenoid/Transmission Relay Circuit Failure

Possible Causes:



3-4 Solenoid control circuit is open or shorted to ground
 
3-4 Solenoid is damaged or has failed
 
Transmission relay power circuit is open (check the fused B+)
 
Transmission relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P0755



A/T 2/4 Solenoid Circuit Failure

Possible Causes:



2/4 Solenoid control circuit is open or shorted to ground
 
2/4 Solenoid control circuit is shorted to system power
 
2/4 Solenoid is damaged or has failed
 
TCM or PCM has failed
 

Trouble Code: P0760



A/T Overdrive Solenoid Circuit Failure

Possible Causes:



O/D Solenoid control circuit is open, shorted to ground or power
 
O/D Solenoid is damaged or has failed
 
TCM relay power circuit to O/D solenoid is open (loss of B+)
 
TCM or PCM has failed
 

Trouble Code: P0765



A/T Underdrive Solenoid Circuit Malfunction

Possible Causes:



U/D Solenoid control circuit is open or shorted to ground
 
U/D Solenoid control circuit is shorted to system power
 
U/D Solenoid is damaged or has failed
 
TCM or PCM has failed
 

Trouble Code: P0783



A/T 3-4 Shift Solenoid - No RPM Drop At Lockup

Possible Causes:



ATF fluid level is burnt, contaminated or low
 
3-4 Solenoid control circuit is open or shorted (intermittent fault)
 
3-4 Solenoid is damaged or has failed
 
Transmission oil pan has excessive debris
 

Trouble Code: P0841



Low/Reverse Pressure Switch Sense Circuit Malfunction

Possible Causes:



L/R pressure switch sense circuit is open or shorted to ground
 
L/R pressure switch sense circuit is shorted to power (B+)
 
L/R pressure switch is damaged or it has failed
 
TCM relay power circuit to L/R switch is open (loss of B+)
 
TCM has failed
 

Trouble Code: P0845



A/T 2/4 Hydraulic Pressure Test Malfunction

Possible Causes:



2/4 pressure is incorrect, or internal transmission faults exist
 
2/4 pressure switch circuit is open, shorted to ground or power
 
2/4 pressure switch is damaged or it has failed
 
Transmission solenoids/TRS assembly is damaged or have failed
 
TCM relay power circuit to 2/4 switch is open (loss of B+)
 
Intermittent wiring or connector problems exist
 
PCM or TCM has failed
 

Trouble Code: P0846



A/T 2/4 Pressure Switch Circuit Malfunction

Possible Causes:



2/4 pressure is incorrect, or internal transmission faults exist
 
2/4 pressure switch circuit is open, shorted to ground or power
 
2/4 pressure switch is damaged or it has failed
 
TCM relay power circuit to L/R switch is open (loss of B+)
 
PCM/TCM has failed
 

Trouble Code: P0850



A/T Park/Neutral Switch Performance

Possible Causes:



Check for any TCM related codes stored in the TCM controller
 
PCM has failed
 

Trouble Code: P0870



A/T Hydraulic Pressure Line Malfunction

Possible Causes:



Check for related line pressure trouble codes
 
Check for related speed ratio and pressure switch codes
 
5v supply circuit is open or is shorted to ground
 
Transmission Control Relay output circuit is open
 
OD Pressure Switch sense circuit is shorted to ground or to voltage
 
Excessive debris in the oil pan
 
Line pressure Sensor connector is loose or damaged
 
Oil pressure switch is damaged or has failed
 
Intermittent wiring or connector problems exist
 
PCM or TCM has failed
 

Trouble Code: P0871



A/T O/D Pressure Switch Circuit Malfunction

Possible Causes:



Related DTCs may be present
 
O/D pressure is incorrect, or internal transmission faults exist
 
O/D pressure switch circuit is open, shorted to ground or power
 
O/D pressure switch is damaged or it has failed
 
TCM relay power circuit to O/D switch is open (loss of B+)
 
Intermittent wiring or connector problems exist
 
PCM or TCM has failed
 

Trouble Code: P0884



Power-Up Automatic Transmission Speed Malfunction

Possible Causes:



TCM power supply circuit to direct battery is open
 
TCM power supply circuit to the ignition switch is open
 
TCM power ground circuit is open or the connector is loose
 
TCM has failed
 

Trouble Code: P0890



A/T TCM Switched Battery Circuit Malfunction

Possible Causes:



2/4 switch circuit is shorted to system power (B+)
 
L/R switch circuit is shorted to system power (B+)
 
O/D switch circuit is shorted to system power (B+)
 
TCM switched battery circuit is damaged
 
Intermittent wiring or connector problems exist
 
PCM/TCM has failed
 

Trouble Code: P0891



A/T TCM Relay Always On

Possible Causes:



TCM relay output circuit is shorted to system power (B+)
 
TCM relay control circuit is shorted to system power (B+)
 
TCM relay is damaged or it has failed (it may be stuck closed)
 
Intermittent wiring or connector problems exist
 
PCM/TCM has failed
 

Trouble Code: P0897



A/T Transmission Fluid Burnt Or Worn Out

Possible Causes:



Automatic transmission fluid is burnt or contaminated
 
Automatic transmission fluid is worn out
 

Trouble Code: P0944



A/T Loss Of Prime Pressure

Possible Causes:



A/T pressure switch connector is damaged, loose or shorted
 
Invalid PRNDL code (shift lever position error)
 
Automatic transmission fluid level is too low
 
Transmission oil filter is clogged or severely restricted
 
Transmission oil pump is damaged or weak
 
Intermittent wiring or connector problems exist
 

Trouble Code: P0951



A/T AutoStick Sensor Circuit Malfunction

Possible Causes:



AutoStick assembly is damaged or has failed
 
AutoStick connector is damaged, loose or shorted
 
Downshift switch circuit is shorted too ground
 
Upshift switch circuit is shorted to ground
 

Trouble Code: P0992



A/T 2/4 & O/D Hydraulic Pressure Test Malfunction

Possible Causes:



2/4 pressure switch circuit is open, shorted to ground or power
 
2/4 pressure switch is damaged or it has failed
 
O/D pressure switch circuit is open, shorted to ground or power
 
O/D pressure switch is damaged or it has failed
 
Internal transmission faults exist
 
TCM relay power circuit to 2/4 or O/D switch open (loss of B+)
 
PCM/TCM has failed
 

Trouble Code: P1115



General Temperature Sensor Performance

Possible Causes:



Sensor signal circuit is open or shorted to ground
 
Sensor ground circuit is open or shorted to VREF (5v)
 
One or more of the identified Sensors is out-of-calibration
 
Ambient air temperature Sensor is damaged or it has failed
 
PCM High or Low circuit is damaged or it has failed
 

Trouble Code: P1192



Intake Air Temperature Sensor Circuit Low Input

Possible Causes:



IAT Sensor signal circuit is shorted to ground
 
IAT Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1193



Intake Air Temperature Sensor Circuit High Input

Possible Causes:



IAT Sensor connector is damaged or it is open
 
IAT Sensor signal circuit is open between the Sensor and PCM
 
IAT Sensor ground circuit is open between the Sensor and PCM
 
IAT Sensor damaged or has failed
 
PCM has failed
 

Trouble Code: P1195



O2 (B1 S1) Circuit Insufficient Activity

Possible Causes:



Base engine mechanical fault affecting more than one cylinder
 
Exhaust leak present in exhaust manifold or exhaust pipes
 
O2 element fuel contamination or has deteriorated
 
O2 signal circuit or ground circuit has high resistance
 
PCM has failed
 

Trouble Code: P1196



O2 (B2 S1) Circuit Insufficient Activity

Possible Causes:



Base engine mechanical fault affecting more than one cylinder
 
Exhaust leak present in exhaust manifold or exhaust pipes
 
O2 element fuel contamination or has deteriorated
 
O2 signal circuit or ground circuit has high resistance
 

Trouble Code: P1281



Engine Is Cold Too Long

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
ECT Sensor signal circuit has high resistance
 
ECT Sensor is damaged or it has failed
 
Inspect for low coolant level or an incorrect coolant mixture
 

Trouble Code: P1282



Fuel Pump Relay Control Circuit Malfunction

Possible Causes:



Fuel pump relay control circuit is open or shorted to ground
 
Fuel pump relay power circuit is open (test power from Ignition)
 
Fuel pump relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1289



Manifold Tuning Valve Control Circuit Malfunction

Possible Causes:



MTV control circuit is open between the solenoid and PCM
 
MTV control circuit is shorted to Sensor or chassis ground
 
MTV is damaged or has failed
 
PCM has failed
 

Trouble Code: P1294



Target Idle Speed Not Reached

Possible Causes:



Engine vacuum leak in a hose, brake booster or in the engine
 
IAC motor control circuits open or grounded in the wire harness
 
Throttle body dirty or restricted (trying cleaning it and retesting)
 
Throttle linkage or throttle plate not in the correct position
 
PCM has failed
 

Trouble Code: P1296



5-Volt VREF Supply Not Present

Possible Causes:



MAP Sensor VREF circuit open between the Sensor and PCM
 
MAP Sensor ground circuit open between the Sensor and PCM
 
MAP Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P1297



No Change In MAP Signal From Start To Run Transition

Possible Causes:



Engine vacuum port to MAP Sensor clogged, dirty or restricted
 
MAP Sensor signal is skewed or the Sensor is out-of-calibration
 
MAP Sensor VREF circuit open or grounded (intermittent fault)
 
PCM has failed
 

Trouble Code: P1299



Vacuum Leak Present With IAC Valve Fully Seated

Possible Causes:



Leaking engine vacuum hose, brake booster, or in the engine
 
MAP Sensor is out-of-calibration or skewed
 
TP Sensor is damaged or has failed (perform a sweep test)
 
PCM has failed
 

Trouble Code: P1388



Auto Shutdown Relay Control Circuit Malfunction

Possible Causes:



ASD relay control circuit is open between the relay and PCM
 
ASD relay control circuit is shorted to ground
 
ASD relay power circuit is open (test power from Fused B+)
 
ASD relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1389



No Auto Shutdown Relay Output Voltage To PCM

Possible Causes:



ASD relay connector is damaged, loose or shorted
 
ASD relay output circuit is open between the relay and PCM
 
ASD relay power circuit is open (test power from Fused B+)
 
ASD relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1390



Timing Belt Skipped One Tooth Or More

Possible Causes:



Camshaft timing is out of specifications
 
Valve timing is out of specifications
 

Trouble Code: P1391



CKP Or CMP Sensor Signal Intermittent

Possible Causes:



Camshaft Sensor is not installed properly
 
Engine valve timing is not within specifications
 
Perform a CKP and CMP Sensor relearn with the scan tool
 
Tone wheel or pulse ring is damaged
 

Trouble Code: P1398



Misfire Adaptive Numerator At Limit

Possible Causes:



Base engine problem (i.e., low cylinder compression)
 
CKP Sensor crankshaft target variation too large
 
CKP Sensor improperly installed or the CKP Sensor has failed
 
CKP Sensor signal circuit open or shorted (intermittent fault)
 
Tone wheel or pulse ring is damaged
 

Trouble Code: P1486



EVAP Leak Detection Monitor Pinched Hose Detected

Possible Causes:



EVAP vapor hose blocked between the fuel tank and the LDP (i.e., in the OLFV, rollover or vapor hose)
 
EVAP canister is clogged or full of dirt or moisture
 
EVAP ventilation solenoid is damaged or has failed
 
Purge line is loose, damaged or incorrectly routed
 
PCM has failed
 

Trouble Code: P1489



High Speed Radiator Fan Relay Circuit Malfunction

Possible Causes:



HFAN radiator relay control circuit is open or shorted to ground
 
HFAN radiator relay power circuit is open (test power to IGN)
 
HFAN radiator fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1490



Low Speed Radiator Fan Relay Circuit Malfunction

Possible Causes:



LFAN radiator relay control circuit is open or shorted to ground
 
LFAN radiator relay power circuit is open (test power to IGN)
 
LFAN radiator fan relay is damaged or has failed
 
PCM has failed
 

Trouble Code: P1491



Radiator Fan Control Relay Circuit Malfunction

Possible Causes:



Radiator fan control relay circuit is open or shorted to ground
 
Radiator fan control relay circuit is open (test power to IGN)
 
Radiator fan control relay is damaged or has failed
 
PCM has failed
 

 
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