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Code retrieval info
90 Geo 1.6L
91 Geo 1.6L
95 Geo 1.6L

GM Import Trouble Code Info

87-88 Sprint Turbo,89 & later Metro, Tracker, Storm.
12 Diagnostic function working
13 Oxygen sensor or circuit
14 Coolant temperature sensor or circuit (open)
15 Coolant temperature sensor or circuit (shorted)
21 Throttle position sensor or circuit (open)
22 Throttle position sensor or circuit (shorted)
23 Intake air temperature sensor or circuit (open)
24 Vehicle speed sensor (VSS) or circuit
25 Intake air temperature sensor or circuit (shorted)
31 High turbo pressure (87 - 88)
31 Barometric pressure sensor or circuit (89 -95)
32 Barometric pressure sensor or circuit (89 - 95)
32 EGR system (91 - 93)
33 Airflow meter (turbo)
33 Manifold Absolute Pressure (MAP) sensor (90 - 91)
41 Ignition signal problem
42 Crank angle sensor (except Storm)
42 Camshaft position sensor circuit (94-95)
42 Electronic Spark Timing (EST) (Storm)
44 ECM idle switch circuit open
44 Oxygen sensor or circuit - lean exhaust
45 Oxygen sensor or circuit - rich exhaust
46 Idle speed control motor
51 EGR system (except Storm)
51 ECM (Storm)
53 ECM ground circuit
ON Steady ECM faulty

89 - 92 GEO Metro TBI
13 Oxygen Sensor circuit.
14 Coolant Temperature Sensor circuit. High temperature indicated.
15 Coolant Temperature Sensor circuit. Low temperature indicated.
21 Throttle Switch circuit (Manual Transmission).
21 Throttle Position Sensor Signal Voltage High (Automatic Transmission).
22 Throttle Position Sensor Signal Voltage Low.
23 Intake Air temperature (MAT) Sensor. Low temperature indicated.
24 Vehicle Speed Sensor circuit.
25 Intake Air temperature (MAT) Sensor. High temperature indicated.
31 MAP Sensor circuit - Signal Voltage Low Vacuum.
32 MAP Sensor circuit - Signal Voltage High Vacuum.
33 MAP Sensor circuit.
41 Ignition Signal circuit.
42 Crank Angle Sensor.
46 Idle Speed Control Motor circuit.
51 EGR circuit.
53 Ground circuit.
93 - 95
13 Oxygen Sensor circuit. Signal voltage does not change.
14 Engine Coolant Temperature Sensor circuit High Voltage Input. Low temperature indicated.
15 Engine Coolant Temperature Sensor circuit Low Voltage Input. High temperature indicated.
21 Throttle Position Sensor circuit High Voltage Input.
22 Throttle Position Sensor circuit Low Voltage Input.
23 Intake Air temperature Sensor circuit - High Voltage Input. Low temperature indicated.
24 Vehicle Speed Sensor circuit.
25 Intake Air temperature Sensor circuit - Low Voltage Input. High temperature indicated.
31 MAP Sensor circuit Low Voltage Input - Low manifold pressure.
32 MAP Sensor circuit High Voltage Input - High manifold pressure.
41 Ignition Signal circuit.
42 Crankshaft Position Sensor circuit - No Signal for 2 seconds.
46 Idle Speed Control Motor circuit.
51 EGR circuit.

Sprint(non-turbo)

12 Diagnostic function working
13 Oxygen sensor circuit
14 Coolant temperature sensor circuit
21 Throttle position switches or circuit
23 Intake air temperature circuit
32 Barometric Pressure circuit
51 Possible faulty ECM
52 Fuel cut solenoid or circuit
53 Secondary air circuit
54 Mixture control solenoid or circuit
55 Bowl vent solenoid or circuit

GEO, Sprint, Nova & Spectrum
12 No distributor reference pulse to ECM
13 Oxygen sensor circuit
14 Coolant sensor - high or low temp
21 Throttle Position Sensor (TPS) voltage high or low
23 Intake Air Temperature IAT sensor circuit voltage high or low
24 Vehicle Speed Sensor (VSS) or circuit
32 EGR (Exhaust gas recirculation) EVRV shorted to ground on start-up
33 Manifold Absolute Pressure (MAP) sensor voltage high or low
42 Electronic Spark Timing (EST) circuit
44 Oxygen sensor or circuit indicates lean exhaust (heated type)
45 Oxygen sensor or circuit indicates rich exhaust
51 ECM or EEPROM

Spectrum

12 No distributor reference pulses to ECM
13 Oxygen sensor circuit
14 Coolant sensor circuit shorted.
15 Coolant sensor circuit open.
16 Coolant sensor circuit open.
21 Idle switch out of adjustment (or open circuit) non-Turbo t
21 Throttle Position Sensor (TPS) voltage high-- Turbo
22 Fuel cut off relay or circuit open--non-Turbo
22 Throttle Position Sensor (TPS) voltage low--Turbo
23 Open or grounded Mixture Control(M/C) solenoid or circuit-- non-Turbo
23 Manifold Air Temperature MAT sensor or circuit--Turbo
24 Vehicle Speed Sensor (VSS) or circuit--Turbo
25 Open or grounded vacuum switching valve or circuit--non-Turbo
25 Air Switching Valve (ASV) or circuit--Turbo
31 Wastegate control--Turbo
33 Manifold Absolute Pressure (MAP) sensor voltage high--Turbo
34 Manifold Absolute Pressure (MAP) sensor voltage low--Turbo
42 Electronic Spark Timing (EST) circuit EST circuit is grounded or open. Turbo
42 Fuel cut off relay or circuit non-Turbo type
43 Detonation (knock) sensor or circuit--Turbo type
44 Oxygen sensor or circuit indicates lean exhaust non-Turbo
45 Oxygen sensor or circuit indicates rich exhaust
51 ECM or PROM
53 Shorted switching unit or faulty ECM non-Turbo
54 Mixture Control (M/C) solenoid or circuit, or faulty ECM non-Turbo
55 Faulty ECM non-Turbo

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