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GM Codes 1982-1996
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12
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No reference pulses to Electronic Control Module (ECM)
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13
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Oxygen (O2) Sensor - signal stays low ("lean") during warm engine cruise
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14
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Coolant Temperature Sensor (CTS) - signal voltage is low
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15
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Coolant Temperature Sensor (CTS) - signal voltage is high
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16
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High battery voltage
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OR Direct Ignition System (DIS) fault - line open or shorted to ground
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17
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RPM signal problem
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21
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Throttle Position Sensor (TPS) - signal voltage is high during engine idle or deceleration
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22
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Throttle Position Sensor (TPS) - signal voltage is low during engine idle
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OR Fuel cutoff relay circuit - open or shorted to ground
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23
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Manifold Air Temperature (MAT) Sensor - signal voltage is low
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OR Throttle Position Sensor (TPS) error
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24
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Vehicle Speed Sensor (VSS) - signal is constant (no pulsing) during engine deceleration
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25
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Manifold Air Temperature (MAT) Sensor - signal voltage is low
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OR Vacuum Switching Valve Circuit open or shorted to ground
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OR ATS Sensor - signal voltage is high
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26
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Quad driver module
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27
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2nd gear switch
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28
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3rd gear switch
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29
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4th gear switch
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31
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Manifold Absolute Pressure (MAP) Sensor - signal voltage is low
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OR Fuel injector
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OR CAM diagnostic
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OR Governor Malfunction
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OR Wastegate overboost
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OR Wastegate Eletrical Signal - open or shorted to ground
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32
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Barometric Pressure (BARO) Sensor circuit failure
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OR Exhaust Gas Recirculation (EGR) valve diagnostic switch - closed during engine startup or open when EGR flow requested by ECM
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OR EGR / EVRV (Electronic Vacuum Regulator Valve)
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33
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Mass Air Flow (MAF) Sensor - signal voltage or frequency is high during engine idle
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OR Manifold Absolute Pressure (MAP) Sensor - signal voltage is high during idle [***Note: Engine mis-fire or unstable idle may cause this code]
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34
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Mass Air Flow (MAF) Sensor - signal voltage or frequency is low during engine cruise
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OR Manifold Absolute Pressure (MAP) Sensor - signal voltage is low during ignition on
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35
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Idle Air Control (IAC) system problem - can not set desired RPM
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36
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Mass Air Flow (MAF) Sensor - burn off circuit problem
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OR Transmission shift problem
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OR Direct Ignition System (DIS) fault - extra or missing pulses in Electronic Spark Timing (EST) signal
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38
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Brake switch circuit failure
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39
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Torque Converter Clutch (TCC) circuit fault
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41
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Cam Sensor (CAM) failure
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OR Cylinder Select Error
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OR Tach Input Error - no reference pulses during engine run
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42
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Electronic Spark Timing (EST) circuit - open or shorted to ground during engine run
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OR Direct Ignition System (DIS) fault - bypass circuit open or shorted ground during engine run
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OR Fuel Cutoff Relay Circuit - open or shorted to ground
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43
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Electronic Spark Timing (EST) Circuit - low voltage detected
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44
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Lean exhaust indication - Oxygen (O2) Sensor voltage stays low after on or two minutes of engine run
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45
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Rich exhaust indication - Oxygen (O2) Sensor voltage stays high after one minute of engine run
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46
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Vehicle Anti-Theft Sytem (VATS) failure
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OR Power Steering Switch failure
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47
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Electronic Control Module (ECM) computer circuit problems - Universal Asynchronous Receiver / Transmitter (UART) link
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48
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Misfire
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49
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Vacuum leak
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51
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Electronic Control Module (ECM) computer circuit problems - Programmable Read-OnlyMemory (PROM)
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OR Checksum errors
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52
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Electronic Control Module (ECM) computer circuit problems - fuel calpac missing, analog todigital converter (A/D) error quad driver module (QDM) fault
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OR Oil Temperature Sensor - signal voltage is low
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53
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Over voltage condition
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OR Exhaust Gas Recirculation (EGR)
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OR Voltage reference error
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OR Vehicle Anti-Theft System (VATS) problems
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We provide our customers with a 15 day, unconditional, return privilege that begins the day you receive your item. If for any reason you decide the item is not right for you, simply return the item to us along with a COPY of your original receipt. There is a 15% restock fee on NEW items. Payments received via PayPal are refunded through paypal. If other payment options are used a check will be used to refund your money. Refunds are processed within two business days from the receipt of the retuned item. Please be sure to include your full contact information.
