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PCM Code List: OBD-1 for 1993-1995

OBD-1 PCM Codes OBD-2 PCM Codes ABS/Chassis Codes Body Codes Network Codes Blank Blank

Code 12Fuel control reference signal (4X) was not received by PCM for 4 seconds while cam sensor pulses were received.
Code 13Oxygen sensor voltage stays between 0.3 and 0.6 volts for 64 seconds. Engine was at normal operating temperature at a speed of over 800 RPM.
Code 14Coolant temperature sensor signal indicates a temperature of over 297 F.
Code 15Coolant temperature sensor signal indicates a temperature colder than -20 F.
Code 16Ignition voltage was either less than 10 volts or greater than 16 volts for 5 seconds.
Code 17Oxygen sensor voltage stays between 0.3 and 0.6 volts for 64 seconds. Engine was at normal operating temperature and over 800 RPM.
Code 19Fuel pump feedback voltage stayed above 7 volts for 6 seconds after ignition was turned on.
Code 20Fuel pump feedback voltage was 2 volts or less for 1.3 seconds.
Code 21TPS voltage was 4.96 volts or more.
Code 22TPS voltage was 0.1 volts or less when the engine was running at 600 RPM or more.
Code 23EST signal did not change when the ECM applied bypass voltage to the ignition module.
Code 24Vehicle speed was less than 5 MPH while transaxle turbine shaft speed was 3000 RPM or more and vehicle was in a forward gear.
Code 25Spark reference signal (24X) was not received by PCM for 4 seconds or longer while cam reference pulses were being received.
Code 26Throttle switch input to the PCM was closed for 2 seconds or longer while the TPS was 15.7 degrees or greater.
Code 27Throttle switch was open when vehicle was coasting down with brake applied. Throttle angle was 12 degrees or less but RPM was greater than desired.
Code 28Transaxle range switch input did not match actual gear selection.
Code 29Transaxle gear ratio does not match the gear ratio commanded by the PCM for 5 seconds.
Code 30TPS was 1.2% or more while ISC was retracting for 29 seconds, or TPS was 9.2% or less while ISC was extending for 29 seconds.
Code 31MAP sensor was greater than 5 volts
Code 32MAP sensor was open showing a reading of 0.8 volts or less
Code 33Wheel speed sensors indicated a rapid decrease in vehicle speed (indicating braking action) without a corresponding change in the extended travel brake switch for 1 second
Code 34MAP sensor signal voltage was too high (low vacuum) for 15 seconds when throttle switch was closed
Code 35PCM reference low signal voltage was less than 1.04 volts or greater than 3.98 volts for 1 second
Code 36EGR pintle position varied more than 10% from desired position, or learned EGR closed position was less than 0.2 volts or greater than 2.0 volts
Code 37Intake air temperature sensor showed a temperature of 297 F or more
Code 38Intake air temperature sensor showed a temperature of 34 F or less
Code 39TCC slip speed was 48 RPM or more for 45 seconds with transaxle in 3rd or 4th gear and TCC commanded ON
Code 40Power steering switch was open for 60 seconds or more when vehicle was at a speed of 45 MPH or greater
Code 41CAM reference pulses were not received when distributor reference pulses were received at an engine speed of 1600 RPM or less
Code 42Left oxygen sensor was lean for more than 50 seconds when engine was warm and at 800 RPM or greater
Code 43Left oxygen sensor was rich for more than 50 seconds when engine was warm and at 800 RPM or greater
Code 44Right oxygen sensor was lean for more than 50 seconds when engine was warm and at 800 RPM or greater
Code 45Right oxygen sensor was rich for more than 50 seconds when engine was warm and at 800 RPM or greater
Code 46Front and rear fuel control block learn values differ by more than 15 counts for 10 minutes
Code 48EGR open command was given during off idle operation
Code 51PROM error
Code 52PCM has lost primary battery power
Code 53Distributor reference pulses were not received for 0.4 seconds when engine speed was greater than 568 RPM
Code 55TPS zero point was out of range
Code 56Turbine shaft speed was less than 50 RPM for 2 seconds with transaxle in gear and vehicle speed 10 MPH or greater
Code 57Transmission fluid temperature was greater than 298 F for 5 seconds
Code 58Pass Key fuel enable was not correct
Code 59Transmission fluid temperature was less than -31 F
Code 60Transmission was not in drive when cruise control was engaged
Code 61Cruise vent solenoid commanded OFF but solenoid remained ON, or commanded ON but solenoid remained OFF
Code 62Cruise vacuum solenoid commanded OFF but solenoid remained ON, or commanded ON but solenoid remained OFF
Code 63Cruise control servo position was at least 39% with cruise engaged. Vehicle speed was 20 MPH higher than the set speed for 0.5 seconds
Code 64Vehicle speed increased more than 16 MPH in 1 second while cruise control was engaged
Code 65Cruise control servo position sensor was shorted, grounded, or open
Code 66Engine RPM was 635 or more for 0.05 seconds with cruise control engaged
Code 67Cruise control Set/Coast or Resume/Accel switch was closed for 10 minutes
Code 68With cruise control engaged the throttle angle was greater than 20 degrees and servo position sensor indicated a stroke 19% or less than commanded for 2 seconds
Code 69Traction control system was active with cruise control engaged
Code 70Throttle position changed too rapidly without a corresponding change in MAP sensor signal when engine was running
Code 72MAP sensor signal changed too rapidly while TPS signal was steady and engine speed did not change
Code 73Coolant temperature sensor voltage has changed 0.3 volts in 1 second
Code 74Intake air temperature sensor signal changed 0.3 volts or more in 0.25 seconds
Code 75Vehicle speed changed by 4 MPH or more in 0.1 second while MAP sensor remained steady with engine running and brakes not applied
Code 76Actual transaxle pressure differed from the commanded value by 0.16 amps or more for 1 second
Code 80TPS "Idle Learn" was not complete after an EPROM reset
Code 83Crankshaft position signal (24X) was not received while cam pulses were being received
Code 85The "Idle Learn" throttle angle was more than 3.9 degrees
Code 86Transmission input and output speed did not agree with the calculated ratio
Code 88Torque converter clutch did not disengage when commanded OFF by PCM
Code 89Transmission gear shift time was too long, 0.55 seconds or longer and adapt could not shorten the shift time for 1 second
Code 90Vehicle speed was 36 MPH or more, brake was applied, but there was no TCC brake switch input for 5 consecutive times
Code 91Vehicle was in gear with a speed of 7 MPH or more but Park/Neutral switch showed vehicle to be in Park/Neutral for 5 seconds
Code 93Traction control system signals were not received by PCM
Code 94Transmission gear selected did not match with the gear commanded for 2 seconds
Code 95Engine stalled but ignition was not turned off
Code 96Throttle angle was 65 degrees or more for 12 seconds with transmission in drive or reverse and vehicle speed was 5 MPH or less with brake being applied
Code 97Gear selector was moved from park or neutral to drive or reverse with engine speed over 2000 RPM but under 6 MPH for 3 seconds
Code 99Servo position sensor indicated that servo was still engaged after cruise control had been disengaged for 2 seconds. Throttle angle was above 20 degrees
Code 106Sudden vehicle deceleration without brake switch being activated
Code 108PROM error
Code 109PCM has lost primary battery power
Code 110Generator remained OFF after being commanded ON by PCM for 15 seconds
Code 112EPROM error. Replace PCM PROM
Code 117Shift "A" or "B" solenoid output was different than commanded for 10 consecutive times
Code 119A fuel injector circuit was open or shorted for 0.5 seconds
Code 120A/C low side temperature sensor showed a temperature less than -33 F or greater than 297 F
Code 121A/C high side temperature sensor showed a temperature less than 23 F or greater than 419 F
Code 122A/C coolant temperature sensor signal voltage indicated a temperature below 23 F or above 419 F with A/C on
Code 123A/C refrigerant pressure was too low
Code 124A/C compressor circuit was shorted (ON) but not requested ON by HVAC
Code 125A/C high pressure switch was on (shorted) with A/C high side temperature greater than 203 F
Code 126A/C high pressure switch disabled A/C compressor clutch 10 times when A/C high side temperature was less than 189 F
Code 128A/C was disabled because of high refrigerant pressure. A/C high side temperature was higher than 189%F or as low as 169 F if code 128 was set 15 times in 30 seconds
Code 131PCM did not receive a signal from the knock sensor. Spark advance was greater than necessary to cause a knock signal
Code 132Knock sensor voltage was above 4.2 volts, or was 0 volts
Code 133PCM indicated a loss of communication data from ABS for over 3 seconds
Code 134PCM indicated a loss of communication data from IPC (instrument panel cluster) for over 5 seconds
Code 135PCM indicated a loss of communication data from HVAC for 10 seconds
Code 136PCM indicated a loss of communication data from DERM (diagnostic energy reserve module) for 20 seconds
Code 137Loss of ABS Traction control data




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