Cherokee, Grand Cherokee, 1999-2005

2.5L L4 - Auto 3

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Trouble Code: P0622



Generator Field Control Circuit Malfunction

Possible Causes:



Generator field control circuit is open or is shorted to ground
 
Generator field control circuit is shorted to system power (B+)
 
Generator field ground circuit is open
 
Generator is damaged or PCM has failed
 
PCM has failed
 

Trouble Code: P0700



Automatic Transmission Control System Malfunction

Possible Causes:



The presence of this code means the TCM detected a problem
 
TCM related Sensor has solenoid is damaged or has failed
 
This code is for information only - check for other TCM codes
 
TCM or PCM has failed
 

Trouble Code: P0703



A/T Brake Switch Sense Circuit Malfunction

Possible Causes:



Brake switch signal circuit or the switch ground circuit is open
 
Brake switch is damaged, out of adjustment or has failed
 
PCM has failed
 

Trouble Code: P0705



A/T Check Shifter Signal Circuit Malfunction

Possible Causes:



TR1, T3, T41 or T42 sense circuit is open
 
TR1, T3, T41 or T42 sense circuit is shorted to ground
 
TR1, T3, T41 or T42 Sensor circuit is shorted to system power
 
Transmission Range Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0711



A/T Transmission Fluid Temperature Sensor Signal - No Rise After Startup

Possible Causes:



TFT Sensor signal has an intermittent high resistance condition
 
TFT Sensor is damaged, skewed or has drifted out of range
 
PCM has failed
 

Trouble Code: P0712



A/T Transmission Fluid Temperature Sensor Low Input

Possible Causes:



TFT Sensor signal circuit is shorted to ground
 
TFT Sensor is damaged or has failed (it may be shorted)
 
PCM has failed
 

Trouble Code: P0713



A/T Transmission Fluid Temperature Sensor High Input

Possible Causes:



TFT Sensor signal circuit is open between the Sensor and PCM
 
TFT Sensor ground circuit is open between Sensor and PCM
 
TFT Sensor is damaged or has failed (it may be open internally)
 
PCM has failed
 

Trouble Code: P0715



A/T Input Speed Sensor Circuit Malfunction

Possible Causes:



ISS signal (+) circuit is open, shorted to ground or to power
 
ISS signal (-) circuit is open, shorted to ground or to power
 
ISS is damaged or has failed (it may be open internally)
 
Overdrive clutch drum lugs are damaged or missing
 
PCM has failed
 

Trouble Code: P0720



A/T Output Speed Sensor - Low Output Above 15 MPH

Possible Causes:



OSS signal (+) circuit is open, shorted to ground or to power
 
OSS signal (-) circuit is open, shorted to ground or to power
 
OSS is damaged or has failed (it may be open internally)
 
Parking pawl lugs damaged or missing
 
PCM has failed
 

Trouble Code: P0731



A/T Additional Gear Ratio Error In First Gear

Possible Causes:



U/D and 2/4 pressures less than 105 psi
 
U/D or L/R clutch volume indexes out of specification
 
L/R accumulator seals are damaged or L/R switch valve stuck
 
L/R switch valve stuck in first gear position
 
Transmission has an internal leak (U/D or other seals leaking)
 

Trouble Code: P0732



A/T Additional Gear Ratio Error In Second Gear

Possible Causes:



U/D and L/R pressures less than 95 psi at 2000 rpm
 
U/D or 2/4 clutch volume indexes out of specification
 
L/R accumulator seals are damaged or L/R switch valve stuck
 
Transmission has an internal leak (U/D or 2/4 seals leaking)
 
L/R switch valve stuck in first gear position
 

Trouble Code: P0733



A/T Additional Gear Ratio Error In Third Gear

Possible Causes:



O/D and U/D pressures less than 75 psi
 
O/D or U/D clutch volume indexes out of specification
 
O/D accumulator seals are damaged
 
L/R switch valve stuck in first gear position
 
Transmission has an internal leak (U/D seals leaking)
 

Trouble Code: P0734



A/T Additional Gear Ratio Error In Fourth Gear

Possible Causes:



Customer may complain of intermittent 4th gear operation
 
O/D and 2/4 pressures less than 75 psi
 
O/D or 2/4 clutch volume indexes out of specification
 
O/D accumulator seals are damaged
 
Transmission enters "limp in" mode running in 4th gear
 

Trouble Code: P0735



A/T Gear Ratio Error Fourth Prime

Possible Causes:



Related Gear Ratio trouble codes may be stored (note that some of these Gear Ratio trouble codes may be intermittent)
 
Transmission has internal problems or damage present
 

Trouble Code: P0736



A/T Additional Gear Ratio Error In Reverse Gear

Possible Causes:



Customer may complain of intermittent Reverse gear operation
 
Related Gear Ratio trouble codes may be stored
 
Transmission has internal problems or damage present
 

Trouble Code: P0740



A/T Torque Converter Clutch - No RPM Drop At Lockup

Possible Causes:



Internal transmission component fault (Input or Reaction shaft)
 
Internal transmission leakage (valve body leaking or seal rings)
 
Converter clutch valve or clutch timing valve is sticking
 
TCC assembly has failed
 

Trouble Code: P0743



A/T Torque Converter Clutch Solenoid Circuit Failure

Possible Causes:



TCC power circuit is open between the solenoid and Fused B+
 
TCC solenoid control circuit is open or shorted to ground
 
TCC solenoid control circuit is shorted to system power
 
TCC solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0748



A/T Governor Pressure Solenoid/Transmission Relay Fault

Possible Causes:



A/T transmission relay power circuit is open (test power to B+)
 
A/T transmission relay is damaged or has failed
 
Governor pressure solenoid circuit is open or shorted to ground
 
Governor pressure solenoid is damaged or has failed
 
PCM has failed
 

Trouble Code: P0750



A/T Low/Reverse Solenoid Circuit Failure

Possible Causes:



L/R solenoid control circuit is open or shorted to ground
 
L/R solenoid control circuit is shorted to system power
 
L/R Solenoid is damaged or has failed
 
TCM or PCM has failed
 

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: P0756



A/T Shift Solenoid 'B' Mechanical Failure

Possible Causes:



ATF level is low, or the ATF fluid is contaminated
 
A/T SSB is damaged (mechanical fault) or has failed
 
Automatic transmission has internal damage or 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: 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
 

 
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