Cherokee, Grand Cherokee, 1999-2005

4.7L V8 VIN J Auto 2

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Trouble Code: P0137



O2 (B1 S2) Circuit Short to Ground

Possible Causes:



O2 signal circuit is shorted to chassis or Sensor ground
 
O2 ground circuit is open (circuit reads 170 mV when open)
 
O2 may be contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0138



O2 (B1 S2) Circuit Short to Voltage

Possible Causes:



O2 signal tracking (wet/oily) in connector due to short from signal to power circuit
 
O2 signal circuit is open
 
O2 ground circuit is open
 
O2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0139



O2 (B1 S2) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
O2 element is contaminated, deteriorated or it has failed
 
O2 ground or O2 signal circuit has high resistance
 

Trouble Code: P0140



O2 (B1 S2) Remains At Center

Possible Causes:



Exhaust leak present in exhaust manifold or exhaust pipes
 
O2 element is fuel contaminated or has deteriorated
 
O2 signal circuit or ground circuit has high resistance
 
PCM has failed
 

Trouble Code: P0141



O2 (B1 S2) Heater Circuit

Possible Causes:



ASD relay output (power) circuit to the heater is open
 
O2 heater ground circuit open or O2 signal circuit is open
 
O2 heater element has high resistance
 
O2 heater element has failed (open or shorted)
 
PCM has failed
 

Trouble Code: P0151



O2 (B2 S1) Circuit Short to Ground

Possible Causes:



O2 signal circuit is shorted to chassis or Sensor ground
 
O2 signal circuit is open (circuit reads 450 mV when open)
 
O2 ground circuit is open (circuit reads 170 mV when open)
 
O2 may be contaminated or it has failed
 
PCM has failed
 

Trouble Code: P0152



O2 (B2 S1) Short to Voltage

Possible Causes:



O2 signal tracking in connector due to wet/oily conditions
 
O2 ground circuit is open
 
O2 heater supply circuit is open
 
O2 signal circuit is open
 
O2 element is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0153



O2 (B2 S1) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
O2 signal or ground circuit has a high resistance condition
 
O2 element is fuel contaminated
 
O2 element is deteriorated or it has failed
 

Trouble Code: P0154



O2 (B2 S1) Remains At Center

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
O2 signal or ground circuit has a high resistance condition
 
O2 element is fuel contaminated
 
O2 element is deteriorated or it has failed
 

Trouble Code: P0155



O2 (B2 S1) Heater Circuit

Possible Causes:



ASD relay output (power) circuit to the heater is open
 
O2 heater ground circuit open or O2 signal circuit is open
 
O2 heater element has high resistance
 
O2 heater element has failed (open or shorted)
 
PCM has failed
 

Trouble Code: P0157



O2 (B2 S2) Circuit Shorted to Ground

Possible Causes:



O2 signal circuit is shorted to chassis or Sensor ground
 
O2 may be contaminated or it has failed
 
PCM return or signal circuit is damaged or has failed
 

Trouble Code: P0158



O2 (B2 S2) Circuit Shorted to Ground

Possible Causes:



O2 signal tracking due to wet/oily condition in the connector
 
O2 signal circuit is open or shorted to system power
 
O2 is damaged or is has failed
 
PCM has failed
 

Trouble Code: P0159



O2 (B2 S2) Slow Response

Possible Causes:



Exhaust leak
 
O2 signal circuit is open or shorted
 
O2 downstream return circuit is open or shorted
 
O2 Sensor is damaged or has failed
 

Trouble Code: P0161



O2 (B2 S2) Slow Response

Possible Causes:



ASD relay output (power) circuit to the heater is open
 
O2 heater ground circuit is open or O2 signal circuit open
 
O2 heater element has high resistance, is open or shorted
 
PCM has failed
 

Trouble Code: P0165



Starter Relay Circuit

Possible Causes:



Starter Relay control circuit is open
 
Starter Relay Control circuit is grounded
 
PCM has failed
 

Trouble Code: P0171



Fuel System Lean (Bank 1)

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Base engine mechanical problem causing a lean A/F condition
 
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
 
Fuel delivery component fault (clogged filter, low fuel pressure)
 
O2 element is contaminated, deteriorated or it has failed
 
Vacuum hose is disconnected, broken, leaking or loose
 

Trouble Code: P0172



Fuel System Rich (Bank 1)

Possible Causes:



Base engine fault (i.e., cam timing incorrect, oil level too high)
 
EVAP vapor recovery system failure (e.g., canister full of fuel)
 
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
 
Fuel delivery component fault (injector leak, high fuel pressure)
 
O2 element is contaminated, deteriorated or it has failed
 
O2 heater is damaged or it has failed
 

Trouble Code: P0174



Fuel System Lean (Bank 2)

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Base engine mechanical problem causing a lean A/F condition
 
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
 
Fuel delivery component fault (clogged filter, low fuel pressure)
 
O2 element is contaminated, deteriorated or it has failed
 
Vacuum hose is disconnected, broken, leaking or loose
 

Trouble Code: P0175



Fuel System Rich (Bank 2)

Possible Causes:



Base engine fault (i.e., cam timing incorrect, oil level too high)
 
EVAP vapor recovery system has failed (canister full of fuel)
 
Fuel injector (one or more) leaking or pressure regulator leaking
 
O2 element is deteriorated or has failed
 

Trouble Code: P0196



Engine Oil Temperature Sensor Circuit Performance

Possible Causes:



Engine oil temp signal circuit is open or is shorted to ground or to battery voltage
 
Engine oil temp Sensor ground circuit is open
 
Engine oil temp signal circuit is shorted to Sensor ground
 
Engine oil temp Sensor has failed
 
PCM has failed
 

Trouble Code: P0197



Engine Oil Temperature Sensor Circuit Low

Possible Causes:



Engine oil temp signal circuit is shorted to ground
 
Engine oil temp signal circuit is shorted to Sensor ground
 
Engine oil temp Sensor has failed
 
PCM has failed
 

Trouble Code: P0198



Engine Oil Temperature Sensor Circuit High

Possible Causes:



Engine oil temp signal circuit is open or is shorted to battery voltage
 
Engine oil temp Sensor ground circuit is open
 
Engine oil temp Sensor has failed
 
PCM has failed
 

Trouble Code: P0201



Injector 1, 2, 3, 4, 5, or 6 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0202



Injector 1, 2, 3, 4, 5, or 6 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0203



Injector 1, 2, 3, 4, 5, or 6 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0204



Injector 1, 2, 3, 4, 5, or 6 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0205



Injector 1, 2, 3, 4, 5, or 6 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0206



Injector 1, 2, 3, 4, 5, or 6 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0207



Injector 1, 2, 3, 4, 5, 6, 7 or 8 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0208



Injector 1, 2, 3, 4, 5, 6, 7 or 8 Control

Possible Causes:



ASD relay output circuit failure
 
Fuel injector has malfunctioned or failed
 
Fuel injector control circuit is open or shorted to ground
 
PCM has failed
 

Trouble Code: P0218



A/T High Temperature Operation Activated

Possible Causes:



Engine cooling system malfunction present
 
High temperature operations activated
 
Transmission oil pump flow is too low or it is restricted
 

Trouble Code: P0221



Throttle Position Sensor No. 2 Performance

Possible Causes:



TP Sensor No. 1 or 2 signal circuit is shorted to battery voltage or to ground
 
TP Sensor No. 1 or 2 signal circuit has high resistance
 
5v supply circuit is shorted to ground
 
TP Sensor return circuit has high resistance
 
TP Sensor No. 1 signal circuit shorted to TP Sensor No. 2 signal circuit
 
TP Sensor or throttle body damaged or has failed
 
PCM has failed
 

Trouble Code: P0223



Throttle Position Sensor No. 2 Circuit High

Possible Causes:



TP Sensor No. 2 signal circuit shorted to battery voltage or to 5v supply circuit
 
TP Sensor return circuit is open
 
TP Sensor or throttle body is damaged or has failed
 
PCM has failed
 

Trouble Code: P0300



Multiple Cylinder Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects two or more cylinders
 
Erratic or interrupted CKP or CMP Sensor signals
 
Fuel delivery component fault that affects two or more cylinders (i.e., a contaminated, dirty or sticking fuel injector)
 
Ignition system problem (coil or plug) in two or more cylinders
 
Vehicle driven with low fuel pressure or while very low on fuel
 

Trouble Code: P0301



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0302



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0303



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0304



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0305



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

Trouble Code: P0306



Cylinder 1-10 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or EVAP system
 
Base engine mechanical fault that affects only one cylinder
 
Fuel delivery component fault that affects only one cylinder (e.g., a dirty fuel injector)
 
Ignition system problem (coil or plug) in only one cylinder
 

 
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