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General Motors Diagnostic Codes, Trouble Codes and Descriptions. GEO Metro.

WesTech Auto

Diagnostic Codes

General Motors

GEO Metro
Throttle Body Injection
1989 - 1992
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.
1993 - 1995
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.
The Diagnostic Codes and Explanations are derived from Manufacturer supplied Technical Data. WesTech does not guarantee the accuracy of this Information nor can it be held liable for providing it.
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