ION, L-Series, S-Series 1999-2005

1.9L I4 VIN 8 Auto 1

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1.9L I4 VIN 8 Auto

Trouble Code: B3538



Oil Life Reset Switch Circuit Low Input

Possible Causes:



Oil Life Reset switch connector is damaged or shorted
 
Oil Life Reset switch circuit is shorted to ground
 
Oil Life Reset switch is damaged or it has failed
 

Trouble Code: P0105



MAP Sensor Circuit Malfunction

Possible Causes:



Base engine (an intake manifold leak can cause this code)
 
MAP sensor signal or ground circuit has high resistance
 
MAP sensor is contaminated (moisture or icing problems)
 
MAP sensor is damaged, sticking or it has failed
 

Trouble Code: P0107



MAP Sensor Circuit Low Input

Possible Causes:



MAP sensor signal circuit shorted to sensor or chassis ground
 
MAP sensor power circuit open between the sensor and PCM
 
MAP sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0108



MAP Sensor Circuit High Input

Possible Causes:



MAP sensor signal circuit is open, shorted to VREF or to B+
 
MAP sensor ground circuit is open between sensor and PCM
 
MAP sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0112



IAT Sensor Circuit High Temperature

Possible Causes:



IAT sensor signal circuit is shorted to sensor or chassis ground
 
IAT sensor is damaged or it has failed (it may be shorted)
 
IAT sensor is located in the MAF sensor unit on some engines
 
PCM has failed
 

Trouble Code: P0113



IAT Sensor Circuit Low Temperature

Possible Causes:



IAT sensor signal circuit is open between the sensor and PCM
 
IAT sensor signal circuit is shorted to VREF (5v)
 
IAT sensor is damaged or it has failed (it may be open)
 
IAT sensor is located in the MAF sensor unit on some engines
 
PCM has failed
 

Trouble Code: P0117



ECT Sensor Circuit Low Input (High Temperature)

Possible Causes:



ECT sensor signal circuit shorted to sensor or chassis ground
 
ECT sensor is damaged or it has failed (it may be shorted)
 
PCM has failed
 
TSB 01-06-04-005 contains a repair procedure for this code
 

Trouble Code: P0118



ECT Sensor Circuit High Input (Low Temperature)

Possible Causes:



ECT sensor signal circuit is open between the sensor and PCM
 
ECT sensor signal circuit is shorted to VREF (5v)
 
ECT sensor is damaged or it has failed (it may be open)
 
PCM has failed
 
TSB 01-06-04-005 contains a repair procedure for this code
 

Trouble Code: P0121



TP Sensor Signal Out of Range

Possible Causes:



TP sensor signal circuit is shorted to ground (intermittent fault)
 
TP sensor signal circuit is open (intermittent fault)
 
TP sensor VREF circuit is open or shorted (intermittent fault)
 
TP sensor is damaged or it failed (may be cracked or sticking)
 
PCM has failed
 

Trouble Code: P0122



TP Sensor Circuit Low Input

Possible Causes:



TP sensor connector is damaged or shorted
 
TP sensor signal circuit is shorted to sensor ground
 
TP sensor VREF circuit is open between sensor and PCM
 
TP sensor is damaged or it failed (it may be shorted)
 
PCM is damaged or it has failed
 

Trouble Code: P0123



TP Sensor Circuit High Input

Possible Causes:



TP sensor connector is damaged, open or shorted
 
TP sensor signal circuit is shorted to VREF (5v)
 
TP sensor ground circuit is open between the sensor and PCM
 
TP sensor is damaged or it failed (it may be open)
 
PCM is damaged or it has failed
 

Trouble Code: P0125



Engine Cooling System Temperature Too Low

Possible Causes:



Check the operation of the thermostat (it may be stuck open)
 
Cooling Fan running continuously (i.e., it is always "on")
 
ECT sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0130



HO2S-11 (Bank 1 Sensor 1) Signal Range/Performance

Possible Causes:



Air leaks in exhaust system, or the exhaust system is restricted
 
EVAP Purge system malfunction or charcoal canister problem
 
HO2S signal circuit is open or shorted to ground
 
Front HO2S heater is damaged, or the HO2S has failed
 
PCM has failed
 
TSB 02-06-04-017 contains a repair procedure for this code
 

Trouble Code: P0131



HO2S-11 (Bank 1 Sensor 1) Circuit Low Input

Possible Causes:



Fuel system too lean (SHRTFT from 160-169 or rich correction)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0132



HO2S-11 (Bank 1 Sensor 1) Circuit High Input

Possible Causes:



Fuel system too rich (SHRTFT from 100-101 or lean correction)
 
HO2S signal circuit is shorted to the system power (B+)
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0133



HO2S-11 (Bank 1 Sensor 1) Slow Response

Possible Causes:



Exhaust leak present in the exhaust manifold or exhaust pipes
 
HO2S connector is damaged or corroded (intermittent fault)
 
HO2S element is contaminated with poor fuel, silicon or water
 

Trouble Code: P0134



HO2S-11 (Bank 1 Sensor 1) Circuit Insufficient Activity

Possible Causes:



HO2S connector is damaged or corroded (check ground circuit)
 
HO2S ground circuit has a high resistance condition
 
HO2S signal circuit is open or has a high resistance condition
 
HO2S element is damaged or it has failed
 

Trouble Code: P0137



HO2S-12 (Bank 1 Sensor 2) Circuit Low Input

Possible Causes:



Fuel system too lean (SHRTFT from 160-169 or rich correction)
 
HO2S signal circuit is shorted to the sensor or chassis ground
 
HO2S is damaged (i.e., cracked) or air reference hole clogged
 
PCM has failed
 

Trouble Code: P0138



HO2S-12 (Bank 1 Sensor 2) Circuit High Input

Possible Causes:



HO2S connector is damaged, corroded or shorted
 
HO2S signal circuit is shorted to heater or system power (B+)
 
HO2S signal tracking (water intrusion) in the connector causing a short between the HO2S signal and heater power circuits
 
HO2S is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0140



HO2S-12 (Bank 1 Sensor 2) Signal Insufficient Activity

Possible Causes:



Rear HO2S connector is damaged, loose or open
 
Rear HO2S ground circuit is open or has a high resistance
 
Rear HO2S signal circuit is open or has a high resistance
 
Rear HO2S is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0141



HO2S-12 (Bank 1 Sensor 2) Heater Circuit Malfunction

Possible Causes:



HO2S heater control circuit is open or has high resistance
 
HO2S heater control circuit is shorted to system power
 
HO2S heater power circuit is open (check the EGR 10A fuse)
 
HO2S heater element is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0171



Fuel Trim System Lean (Bank 1)

Possible Causes:



Air leaks in intake manifold, exhaust pipes or exhaust manifold
 
Fuel control sensor out of calibration (ECT, IAT MAF or MAP)
 
Low fuel pressure (fuel filter clogged, pressure regulator failure)
 
One or more injectors restricted or pressure regulator has failed
 
HO2S element is contaminated, deteriorated or it has failed
 
Vacuum hose is disconnected, broken, leaking or loose
 

Trouble Code: P0172



Fuel Trim System Rich (Bank 1)

Possible Causes:



Base engine "mechanical" fault affecting one or more cylinders
 
EVAP system component has failed or canister fuel saturated
 
Fuel delivery system supplying too much fuel during cruise or idle periods (e.g., faulty fuel pump, or faulty pressure regulator)
 
Fuel injector(s) is leaking or stuck partially open (one or more)
 
HO2S is contaminated, deteriorated or it has failed
 
MAP sensor is out of calibration (check the MAP sensor signal)
 

Trouble Code: P0201



Fuel Injector 1 Control Circuit Malfunction

Possible Causes:



Fuel injector control circuit is open between injector and PCM
 
Fuel injector control circuit grounded between injector and PCM
 
Fuel injector power circuit is open (check the fuel injector fuse)
 
Fuel injector is damaged or it has failed
 
PCM is damaged
 

Trouble Code: P0202



Fuel Injector 2 Control Circuit Malfunction

Possible Causes:



Fuel injector control circuit is open between injector and PCM
 
Fuel injector control circuit grounded between injector and PCM
 
Fuel injector power circuit is open (check the fuel injector fuse)
 
Fuel injector is damaged or it has failed
 
PCM is damaged
 

Trouble Code: P0203



Fuel Injector 3 Control Circuit Malfunction

Possible Causes:



Fuel injector control circuit is open between injector and PCM
 
Fuel injector control circuit grounded between injector and PCM
 
Fuel injector power circuit is open (check the fuel injector fuse)
 
Fuel injector is damaged or it has failed
 
PCM is damaged
 

Trouble Code: P0204



Fuel Injector 4 Control Circuit Malfunction

Possible Causes:



Fuel injector control circuit is open between injector and PCM
 
Fuel injector control circuit grounded between injector and PCM
 
Fuel injector power circuit is open (check the fuel injector fuse)
 
Fuel injector is damaged or it has failed
 
PCM is damaged
 

Trouble Code: P0217



Hot Light Requested, Engine Over-Temperature

Possible Causes:



Possible engine over-heated condition present
 
Check for anything that could cause the engine to overheat (i.e., the coolant level, the cooling system operation, a restricted radiator or a cooling fan that is not operating)
 

Trouble Code: P0218



Engine Coolant Over-Temperature Malfunction

Possible Causes:



Check the ATF level, and for contaminated or burnt fluid
 
Check for towing overload or an oil cooler fault.
 
Check the cooling system (i.e., the coolant level, the cooling system operation, a restricted radiator or cooling fan problem)
 
Check the transmission cooler and lines for a restriction
 

Trouble Code: P0261



Fuel Injector 1 Control Circuit Low Input

Possible Causes:



Fuel Injector 1 control circuit is open or shorted to ground
 
Fuel injector power circuit is open (check the Injector 10A fuse)
 
Fuel Injector 1 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0262



Fuel Injector 1 Control Circuit High Input

Possible Causes:



Fuel Injector 1 control circuit is open or shorted to ground
 
Fuel Injector 1 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0264



Fuel Injector 2 Control Circuit Low Input

Possible Causes:



Fuel Injector 2 control circuit is open or shorted to ground
 
Fuel injector power circuit is open (check the Injector 10A fuse)
 
Fuel Injector 2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0265



Fuel Injector 2 Control Circuit High Input

Possible Causes:



Fuel Injector 2 control circuit is open or shorted to ground
 
Fuel Injector 2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0267



Fuel Injector 3 Control Circuit High Input

Possible Causes:



Fuel Injector 3 control circuit is open or shorted to ground
 
Fuel Injector 3 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0270



Fuel Injector 4 Control Circuit Low Input

Possible Causes:



Fuel Injector 4 control circuit is open or shorted to ground
 
Fuel injector power circuit is open (check the Injector 10A fuse)
 
Fuel Injector 4 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0271



Fuel Injector 4 Control Circuit High Input

Possible Causes:



Fuel Injector 4 control circuit is open or shorted to ground
 
Fuel Injector 4 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0300



Random Misfire Detected

Possible Causes:



Base engine mechanical fault that affects one or more cylinders
 
Fuel metering fault that affects more than one cylinder
 
Fuel pressure too low or too high, fuel supply contaminated
 
EGR valve is damaged or sticking (check for any EGR codes)
 
PCV system has a large vacuum leak (check the PCV hoses)
 
EVAP system problem or the EVAP canister is fuel saturated
 
Ignition system fault (a coil) that affects more than one cylinder
 
TSB 03-T-01 contains a repair procedure for this trouble code
 

Trouble Code: P0301



Cylinder 1 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only Cylinder 1
 
Fuel delivery component fault (i.e., dirty or sticking fuel injector)
 
Ignition system fault (coil or plug) that affects only Cylinder 1
 
TSB 03-T-01 contains a repair procedure for this trouble code
 

Trouble Code: P0302



Cylinder 2 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only Cylinder 2
 
Fuel delivery component fault (i.e., dirty or sticking fuel injector)
 
Ignition system fault (coil or plug) that affects only Cylinder 2
 
TSB 03-T-01 contains a repair procedure for this trouble code
 

Trouble Code: P0303



Cylinder 3 Misfire Detected

Possible Causes:



Air leak in the intake manifold, or in the EGR or PCM system
 
Base engine mechanical fault that affects only Cylinder 3
 
Fuel delivery component fault (i.e., dirty or sticking fuel injector)
 
Ignition system fault (coil or plug) that affects only Cylinder 3
 
TSB 03-T-01 contains a repair procedure for this trouble code
 

 
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