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1999 Oldsmobile Alero 2.4L engine MIL (Malfunction indicator lamp) or CEL (check engine light) and Track Off Light












After checking every thing out and hooking up to a diagnostic tool error code DTC P0113 was indicated.

Diagnostic Trouble Code Alero: P0113 Intake air temperature circuit high input.

IAT Intake Air Temperature Sensor will cause these problems.

Here is a picture showing the location of the IAT on the 1999 2.4L Oldsmobile Alero



Basically the IAT on the 1999 Oldsmobile Alero is located after the air cleaner box before the throttle body on the elbow part of the intake hose.

First Check the electrical connections on the sensor and the plug for any corrosion or signs of week wires.. If after checking the sensor the DTC can not be reset replace the sensor preferably with GM or AC Delco part ... DO NOT use BOSH parts from O'reilley or the like ...



GM, and Toyota products are very finicky when it comes to replacement sensors.. use only Dealer Certified or OEM parts..
















Oldsmobile Alero DTC
PCM Diagnostic Trouble Codes

P0101-Mass air flow sensor circuit, range or performance problem
P0102-Mass air flow sensor circuit, low input
P0103-Mass air flow sensor circuit, high input
P0105-Manifold absolute pressure sensor or throttle position sensor circuit malfunction
P0106-Manifold absolute pressure sensor circuit, range or performance problem
P0107-Manifold absolute pressure sensor circuit, low input
P0108-Manifold absolute pressure sensor circuit, high input
P0112-Intake air temperature circuit, low input
P0113-Intake air temperature circuit, high input
P0117-Engine coolant temperature circuit, low input
P0118-Engine coolant temperature circuit, high input
P0121-Throttle position sensor circuit, range or performance problem
P0122-Throttle position sensor circuit, low input
P0123-Throttle position sensor circuit, high input
P0125-Insufficient coolant temperature for closed loop fuel control
P0131-Oxygen sensor circuit, low voltage (upstream sensor)
P0132-Oxygen sensor circuit, high voltage (upstream sensor)
P0133-Oxygen sensor circuit, slow response (upstream sensor)
P0134-Oxygen sensor circuit - no activity detected (upstream sensor)
P0135-Oxygen sensor heater circuit malfunction (upstream sensor)
P0137-Oxygen sensor circuit, low voltage (downstream sensor)
P0138-Oxygen sensor circuit, high voltage (downstream sensor)
P0140-Oxygen sensor circuit - no activity detected (downstream sensor)
P0141-Oxygen sensor heater circuit malfunction (downstream sensor)
P0171-System too lean
P0172-System too rich
P0200-Injector circuit malfunction
P0201-Injector circuit malfunction - cylinder no. 1
P0202-Injector circuit malfunction - cylinder no. 2
P0203-Injector circuit malfunction - cylinder no. 3
P0204-Injector circuit malfunction - cylinder no. 4
P0205-Injector circuit malfunction - cylinder no. 5
P0206-Injector circuit malfunction - cylinder no. 6
P0218-Transaxle fluid over temperature
P0230-Fuel pump relay control circuit malfunction
P0300-Random/multiple cylinder misfire
P0301-Cylinder no. 1 misfire detected
P0302-Cylinder no. 2 misfire detected
P0303-Cylinder no. 3 misfire detected
P0304-Cylinder no. 4 misfire detected
P0305-Cylinder no. 5 misfire detected
P0306-Cylinder no. 6 misfire detected
P0325-Knock sensor circuit malfunction
P0327-Knock sensor circuit, low input
P0335-Crankshaft position sensor circuit malfunction
P0336-Crankshaft position sensor circuit, range or performance problem
P0341-Camshaft position sensor circuit, range or performance problem
P0342-Camshaft position sensor circuit, low input
P0401-Exhaust gas recirculation, insufficient flow detected
P0403-Exhaust gas recirculation solenoid control circuit malfunction
P0404-Exhaust gas recirculation circuit, open position performance problem
P0405-Exhaust gas recirculation sensor circuit low
P0410-Secondary air injection system
P0412-Secondary air injection solenoid control circuit
P0418-Secondary air injection pump relay control circuit
P0420-Catalyst system efficieny below threshold
P0440-Evaporative semission control system malfunction
P0442-Evaporative semission control system, small leak detected
P0443-Evaporative semission control system, purge control circuit malfunction
P0446-Evaporative semission control system, vent system performance
P0449-Evaporative semission control system, vent control circuit malfunction
P0452-Evaporative semission control system, pressure sensor low input
P0453-Evaporative semission control system, pressure sensor high input
P0460-Fuel level sensor circuit malfunction
P0461-Fuel level sensor circuit, range or performance problem
P0462-Fuel level sensor circuit, low input
P0463-Fuel level sensor circuit, high input
P0480-Cooling fan relay 1 control circuit malfunction
P0481-Cooling fan relay 2 control circuit malfunction
P0502-Vehicle speed sensor circuit low output
P0503-Vehicle speed sensor signal intermittent
P0506-Idle control system, rpm lower that expected
P0507-Idle control system, rpm higher that expected
P0530-Air conditioning refrigerant pressure sensor, circuit malfunction
P0560-System voltage malfunction
P0562-System voltage low
P0563-System voltage high
P0601-Internal control module, memory error
P0602-Control module, programming error
P0620-Charging system performance
P0650-Malfunction Indicator Light (MIL) control circuit
P0654-Tachometer control circuit
P0705-Transmission range sensor, circuit malfunction (PRND123 input)
P0706-Transaxle range switch performance
P0711-Fluid temperature sensor circuit out-of-range
P0712-Fluid temperature sensor circuit low input
P0713-Fluid temperature sensor circuit high input
P0716-Input speed sensor circuit intermittent
P0717-Input speed sensor circuit low input
P0719-Torque converter clutch brake switch circuit low
P0724-Torque converter clutch brake switch circuit high
P0730-Incorrect gear ratio
P0741-Torque converter clutch system stuck off
P0742-Torque converter clutch system stuck on
P0748-Pressure control solenoid valve circuit
P0751-1-2 shift solenoid performance - no first or fourth gear
P0752-1-2 shift solenoid performance - no second or third gear
P0753-1-2 shift solenoid circuit
P0756-2-3 shift solenoid performance - no first or second gear
P0757-2-3 shift solenoid performance - no third or fourth gear
P0758-2-3 shift solenoid
P1106-Manifold absolute pressure sensor circuit intermittent high voltage
P1107-Manifold absolute pressure sensor circuit intermittent low voltage
P1111-Intake air temperature sensor circuit intermittent high voltage
P1112-Intake air temperature sensor circuit intermittent low voltage
P1114-Engine coolant temperature sensor circuit intermittent low voltage
P1115-Engine coolant temperature sensor circuit intermittent high voltage
P1121-Throttle position sensor circuit intermittent high voltage
P1122-Throttle position sensor circuit intermittent low voltage
P1133-Oxygen sensor insufficient switching (upstream sensor)
P1134-Oxygen sensor transition time ratio (upstream sensor)
P1171-Fuel system lean during acceleration
P1189-Engine oil pressure switch circuit
P1200-Fuel injector control circuit
P1336-Crankshaft position sensor system variation not learned
P1350-By-pass line monitor
P1351-Ignition conrtol circuit open
P1352-Ignition by-pass circuit open
P1361-Ignition control circuit not switching
P1362-Ignition by-pass circuit shorted
P1374-Crankshaft position sensor 3X reference circuit
P1380-Electronic brake control module rough road sensing error
P1381-No serial data from electonic brake control module
P1404-EGR valve closed pintle position
P1406-EGR valve pintle position circuit
P1441-EVAP system flow during non-purge
P1554-Cruise control status circuit
P1573-Serial data communication failure with electronic brake and traction control module
P1601-Serial communication malfunction
P1602-Serial data communication failure with electronic brake control module
P1610-Serial date communication failure with body function controller
P1621-PCM memory performance
P1626-Serial data communication failure with vehical theft deterent controller (no password)
P1630-Theft deterent PCM in learn mode
P1631-Theft deterent password incorrect
P1632-Theft deterent fuel disabled
P1635-5-volt reference circuit
P1639-5-volt reference 2 circuit
P1641-Malfunction indicator light control circuit
P1651-Electric cooling fan relay control circuit
P1652-Electric cooling fan relay control circuit
P1654-Air conditioning relay control circuit
P1655-Evaporative emission control system, purge valve solenoid control circuit
P1662-Cruise control inhibit control circuit
P1665-Evaporative emission control system, vent valve solenoid control circuit
P1671-Malfunction indicator light control circuit
P1675-Evaporative emission control system, vent solenoid control circuit
P1676-Evaporative emission control system, purge valve solenoid control circuit
P1810-Pressure switch assembly malfunction
P1811-Long shift time
P1860-Torque converter clutch pulse width modulator solenoid circuit
P1887-Torque converter clutch release switch malfunction

ABS Diagnostic Trouble Codes

C1214-Brake control relay contact circuit open
C1215-Brake control relay contact circuit active
C1216-Brake control relay coil circuit open
C1217-Brake control relay coil circuit short to ground
C1218-Brake control relay coil circuit short to voltage
C1221-LF wheel speed sensor input signal is 0
C1222-RF wheel speed sensor input signal is 0
C1223-LR wheel speed sensor input signal is 0
C1224-RR wheel speed sensor input signal is 0
C1225-LF excessive wheel speed variation
C1226-RF excessive wheel speed variation
C1227-LR excessive wheel speed variation
C1228-RR excessive wheel speed variation
C1232-LF wheel speed circuit open or shorted
C1233-RF wheel speed circuit open or shorted
C1234-LR wheel speed circuit open or shorted
C1235-RR wheel speed circuit open or shorted
C1236-Low system supply voltage
C1237-High system supply voltage
C1238-Left front ESB does not hold motor
C1241-Right front ESB does not hold motor
C1242-Rear ESB does not hold motor
C1244-Left front ABS channel does not move
C1245-Right front ABS channel does not move
C1246-Rear ABS channel does not move
C1247-Left front ABS motor free spins
C1248-Right front ABS motor free spins
C1251-Rear ABS motor free spins
C1252-LF ABS channel in release too long
C1253-RF ABS channel in release too long
C1254-Rear ABS channel in release too long
C1255-EBCM internal malfunction
C1256-Left front ABS motor circuit open

Transmission Diagnostic Trouble Codes

P0218-Transmission fluid over temperature 2.4L and 3.4L
P0502-Vehicle speed sensor (VSS) circuit low input 2.4L
P0502Vehicle speed sensor (VSS) circuit low input 3.4L
P0503-Vehicle speed sensor (VSS) circuit intermittent 2.4L
P0503-Vehicle speed sensor (VSS) circuit intermittent 3.4L
P0711-TFT sensor circuit range or performance 2.4L
P0711-TFT sensor circuit range or performance 3.4L
P0712-Transmission fluid temperature (TFT) sensor circuit low input 2.4L
P0712-Transmission fluid temperature (TFT) sensor circuit low Input 3.4L
P0713-Transmission fluid temperature (TFT) sensor circuit high input 2.4L
P0713-Transmission fluid femperature (TFT) sensor circuit high input 3.4L
P0716-Input speed sensor circuit intermittent 2.4L
P0716-Input speed sensor circuit intermittent 3.4L
P0717-Input speed sensor circuit low input 2.4L
P0717-Input speed sensor circuit low input 3.4L
P0719-Brake switch circuit low input 2.4L

SIR/Airbag Diagnostic Trouble Codes

B1015-Passenger deployment loop resistance high
B1016-Passenger deployment loop resistance low
B1017-Passenger deployment loop open
B1018-Passenger deployment loop short to ground
B1019-Passenger deployment loop short to voltage
B1021-Driver deployment loop resistance high
B1022-Driver deployment loop resistance low
B1024-Driver deployment loop short to ground
B1025-Driver deployment loop short to voltage
B1026-Driver deployment loop open
B1051-Deployment commanded
B1053-Deployment commanded with loop malfunction
B1061-Lamp circuit failure
B1071-Internal SDM failure

Security Diagnostic Trouble Codes

B2947-Security system sensor power cicuit low
B2948-Security system sensor power cicuit high
B2957-Security system sensor data circuit low
B2958-Security system sensor data circuit high
B2960-Security system sensor data incorrect but valid
B3031-Security system controller in learn mode
B3033-Security system indicates tamper

Onstar Diagnostic Trouble Codes (Most people don't have Onstar on their Alero, but there was an option to get it)

B2455-Cellular phone microphone circuit OnStar
B2462-Global positioning system (GPS) signal error
B2470-Cellular phone antenna circuit
B2476-Cellular phone select service switch malfunction
B2482-Cellular phone select switch range or performance
B2483-Global positioning system (GPS) sensor circuit low
B2484-Global positioning system (GPS) sensor circuit open
B1001-Option configuration error
B1004-Keep alive memory (KAM) reset
B1007-EEPROM write error
B1009-EEPROM checksum mismatch