Neon, 2000-2005

2.4L L4 VIN S Std 1

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2.4L L4 VIN S Std

Trouble Code: P0016



Crankshaft/Camshaft Timing Misalignment

Possible Causes:



Base engine problem (i.e., the camshaft timing is not correct)
 
Intermittent condition
 
CKP or CMP Sensor signal is erratic (check with lab scope)
 
Tone wheel or pulse wheel is damaged or contains debris
 
CKP or CMP Sensor, harness or connector has failed
 
PCM has failed
 

Trouble Code: P0031



O2 (B1 S1) Heater Circuit Low

Possible Causes:



O2 assembly is damaged or it has failed
 
O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0032



O2 (B1 S1) Heater Circuit High

Possible Causes:



O2 heater element is damaged or the heater has failed
 
O2 heater control circuit is open or it is shorted to power
 
O2 heater ground circuit is open
 
PCM has failed
 

Trouble Code: P0033



Surge Valve Solenoid Circuit Fault

Possible Causes:



Surge valve power supply is open (test power from ASD relay)
 
Surge valve solenoid circuit is open
 
Surge valve solenoid circuit is shorted to ground or power (B+)
 
Surge valve solenoid is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0037



O2 (B1 S2) Heater Circuit Low

Possible Causes:



O2 assembly is damaged or it has failed
 
O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0038



O2 (B1 S2) Heater Circuit High

Possible Causes:



O2 Sensor failed or improper operation
 
O2 heater element is damaged or failed
 
O2 heater control circuit is open or it is shorted to power
 
O2 heater ground circuit is open
 
PCM has failed
 

Trouble Code: P0051



O2 (B2 S1) Heater Relay Circuit Low

Possible Causes:



O2 assembly is damaged or it has failed
 
O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0052



O2 (B2 S1) Heater Relay Circuit High

Possible Causes:



O2 heater element is damaged or the heater has failed
 
O2 heater control circuit is open or it is shorted to power
 
O2 heater ground circuit is open
 
PCM has failed
 

Trouble Code: P0057



O2 (B2 S2) Heater Relay Circuit Low

Possible Causes:



O2 assembly is damaged or it has failed
 
O2 heater element is damaged or has failed
 
O2 heater control circuit is shorted to ground
 
PCM has failed
 

Trouble Code: P0058



O2 (B2 S2) Heater Relay Circuit High

Possible Causes:



O2 heater element is damaged or the heater has failed
 
O2 heater control circuit is open or it is shorted to power
 
O2 heater ground circuit is open
 
PCM has failed
 

Trouble Code: P0071



Ambient Temperature Sensor Performance

Possible Causes:



AAT Sensor circuit open, shorted to ground or VREF
 
AAT Sensor voltage below 1.0v
 
AAT signal circuit is open or is shorted to ground, to battery voltage or to Sensor ground
 
AAT Sensor ground circuit is open
 
AAT Sensor is damaged or it has failed
 
PCM High or Low circuit is damaged or it has failed
 

Trouble Code: P0072



Ambient Temperature Sensor Circuit Low Input

Possible Causes:



AAT Sensor internal failure
 
AAT signal circuit shorted to ground
 
AAT signal circuit shorted to Sensor ground
 
PCM has failed
 

Trouble Code: P0073



Ambient Temperature Sensor Circuit High Input

Possible Causes:



AAT Sensor signal shorted to VREF (5v) or battery voltage
 
AAT Sensor signal circuit or Sensor ground circuit is open
 
AAT Sensor is damaged (it may be open)
 
PCM has failed
 

Trouble Code: P0107



MAP Sensor Circuit Low Input

Possible Causes:



5-volt supply circuit is open or shorted to ground
 
MAP Sensor signal circuit is shorted to ground or shorted to Sensor ground circuit
 
MAP Sensor has failed
 
PCM 5-volt supply circuit has failed
 

Trouble Code: P0108



MAP Sensor Circuit High Input

Possible Causes:



MAP Sensor signal circuit is open
 
MAP Sensor ground circuit is open
 
MAP Sensor signal circuit shorted to 5-volt supply circuit or to battery voltage
 
MAP Sensor has failed or it has failed (possible open circuit)
 
MAP Sensor has failed
 
PCM has failed
 

Trouble Code: P0111



IAT Sensor Performance

Possible Causes:



IAT Sensor signal circuit is open, shorted to ground or VREF
 
IAT Sensor ground circuit is open
 
IAT Sensor is damaged or it has failed
 
PCM High or Low circuit is damaged or it has failed
 

Trouble Code: P0112



IAT Sensor Circuit Low Input

Possible Causes:



IAT Sensor signal circuit is shorted to chassis ground
 
IAT Sensor signal circuit is shorted to Sensor ground
 
IAT Sensor is damaged or it has failed (an internal short circuit)
 
PCM has failed
 

Trouble Code: P0113



IAT Sensor Circuit High Input

Possible Causes:



IAT Sensor signal circuit shorted to VREF (5v)
 
IAT Sensor signal circuit is open, or the ground circuit is open
 
IAT Sensor is damaged or it has failed (an internal open circuit)
 
PCM has failed
 

Trouble Code: P0116



ECT Sensor Circuit Performance

Possible Causes:



ECT Sensor signal circuit is open or it is shorted battery voltage or to ground
 
ECT Sensor signal circuit is shorted to Sensor ground
 
ECT Sensor ground circuit is open
 
ECT Sensor is damaged or it has failed
 
PCM High or Low circuit is damaged or it has failed
 

Trouble Code: P0117



ECT Sensor Circuit Low Input

Possible Causes:



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

Trouble Code: P0118



ECT Sensor Circuit High Input

Possible Causes:



ECT Sensor signal circuit is shorted to VREF (5v)
 
ECT Sensor signal circuit is open
 
ECT Sensor ground circuit is open
 
ECT Sensor is damaged or it has failed (possible open circuit)
 
PCM has failed
 

Trouble Code: P0122



TP Sensor No. 1 Circuit Low Input

Possible Causes:



TP Sensor sweep
 
Intermittent condition
 
5v supply circuit open or shorted to ground
 
TP Sensor No. 1 signal circuit shorted to ground or to Sensor return circuit
 
TP Sensor or throttle body damaged or has failed
 
PCM has failed
 

Trouble Code: P0123



TP Sensor/APPS Circuit High Input

Possible Causes:



Related TP Sensor engine DTCs present
 
Intermittent wiring or connector problem
 
TP signal circuit is open or is shorted to battery voltage or to 5v supply circuit
 
TP sensor has failed
 
TP sensor ground circuit is open
 
PCM has failed
 

Trouble Code: P0124



TP Sensor/APPS Circuit Intermittent

Possible Causes:



Related TP Sensor engine DTCs present
 
TP Sensor has failed
 
Intermittent wiring or connector problem
 
PCM has failed
 

Trouble Code: P0125



Closed Loop Temperature Not Reached

Possible Causes:



Low coolant level
 
Improper thermostat operation or thermostat failure
 
ECT has failed
 

Trouble Code: P0128



Thermostat Rationality Test

Possible Causes:



Low coolant level
 
Thermostat has failed
 
Signal circuit shorted to battery voltage
 
ECT Sensor has failed or voltage is below 1.0v
 
Signal circuit is open, shorted to ground or shorted to Sensor ground
 
ECT Sensor ground circuit or signal circuit is open
 
PCM has failed
 

Trouble Code: P0129



Barometric Pressure Out-Of-Range

Possible Causes:



IAC signal circuit is low or high
 
Intermittent condition
 
5v supply circuit is open or shorted to ground or to voltage
 
MAP Sensor signal circuit is open or shorted to ground
 
MAP Sensor is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0139



O2 (B1 S2) Slow Response

Possible Causes:



Exhaust leak
 
O2 element is contaminated, deteriorated or it has failed
 
O2 signal circuit or return circuit has failed
 

Trouble Code: P0141



O2 (B1 S2) Heater Circuit

Possible Causes:



O2 heater ground circuit open or O2 signal circuit is open
 
O2 heater element has failed
 
O2 heater ground circuit or control circuit is open
 
PCM has failed
 

Trouble Code: P0152



O2 (B2 S1) Circuit High

Possible Causes:



O2 signal circuit is open or is shorted to battery voltage.
 
O2 upstream return circuit is open or is shorted to battery voltage
 
O2 Sensor is damaged or has failed
 
PCM has failed
 

Trouble Code: P0153



O2 (B2 S1) Slow Response

Possible Causes:



Exhaust leak
 
O2 signal circuit has an open or grounded condition
 
O2 upstream return circuit has an open or grounded condition
 
O2 element is deteriorated or it has failed
 

Trouble Code: P0155



O2 (B2 S1) Heater Circuit

Possible Causes:



O2 heater control circuit is open
 
O2 heater ground circuit is open
 
O2 heater element is damaged or has failed
 
PCM has failed
 

Trouble Code: P0157



O2 (B2 S2) Circuit Low

Possible Causes:



O2 signal circuit is shorted to chassis or Sensor ground
 
O2 is damaged or it has failed
 
PCM has failed
 

Trouble Code: P0158



O2 (B2 S2) Circuit High

Possible Causes:



O2 signal circuit is open or is shorted to battery
 
O2 downstream return circuit is open or is shorted to battery
 
O2 is damaged or it 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: P0171



Fuel System Lean (B1 S1)

Possible Causes:



Restricted fuel supply line
 
Fuel pump inlet strainer plugged or fuel pump has failed
 
O2 Sensor has failed
 
O2 signal circuit or return circuit has failed
 
O2 Sensor heater operation is faulty
 
TP Sensor sweep has failed
 
MAP Sensor operation has failed
 
ECT Sensor operation has failed
 
Engine mechanical problem is present
 
Fuel is contaminated
 
Exhaust leak exists
 

Trouble Code: P0172



Fuel System (S1 B1) Rich

Possible Causes:



O2 Sensor heater or O2 Sensor has failed
 
EVAP purge solenoid failed or improper operation
 
O2 signal circuit or return circuit has failed
 
MAP Sensor has failed or circuit malfunction
 
ECT Sensor has failed or circuit malfunction
 
Engine mechanical problem
 
Fuel filter/pressure regulator has failed or needs repair
 
PCM has failed
 

Trouble Code: P0174



Fuel System (S2 B1) Lean

Possible Causes:



Restricted fuel supply line
 
Fuel pump inlet strainer plugged
 
Fuel pump is damaged or has failed
 
O2 signal circuit or return circuit has failed
 
MAP Sensor has failed or circuit malfunction
 
ECT Sensor has failed or circuit malfunction
 
Engine mechanical problem
 
Fuel filter/pressure regulator has failed or needs repair
 
O2 Sensor has failed
 
PCM has failed
 

Trouble Code: P0175



Fuel System (S2 B1) Rich

Possible Causes:



Restricted fuel supply line
 
Fuel pump inlet strainer plugged
 
Fuel pump is damaged or has failed
 
O2 signal circuit or return circuit has failed
 
MAP Sensor has failed or circuit malfunction
 
ECT Sensor has failed or circuit malfunction
 
Engine mechanical problem
 
Fuel filter/pressure regulator has failed or needs repair
 
O2 Sensor has failed
 
PCM 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
 

 
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