94 LT1 A4 throwing code 37,63,72 help!
Thread Starter
Drifting
Joined: Jun 2002
Posts: 1,305
Likes: 11
From: Savannah Ga.
94 LT1 A4 throwing code 37,63,72 help!
I did a search and I'm coming up with all kinds of answers for these codes...H72 is this a diming light code or gear code???? 
H63 open ciruit for right 02 sensor ..does this mean I have a bad connection.....and what is H37????
H63 open ciruit for right 02 sensor ..does this mean I have a bad connection.....and what is H37????
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
Here's what I have for code list:
1994 & 1995 OBDI LT1 DTC's:
DTC 11 - Malfunction Indicator Lamp (MIL) Circuit
DTC 13 - Bank I (Left) Heated Oxygen Sensor (HO2S) Circuit (Open Circuit)
DTC 14 - Engine Coolant Temperature (ECT) Sensor Circuit ( Voltage Low, High Temp)
DTC 15 - Engine Coolant Temperature (ECT) Sensor Circuit ( Voltage High, Low Temp)
DTC 16 - Distributor Ignition System (Low Resolution Pulse)
DTC 18 - Injector Circuit(s)
DTC 21 - Throttle Position (TP) Sensor Circuit (Signal Voltage High)
DTC 22 - Throttle Position (TP) Sensor Circuit (Signal Voltage Low)
DTC 23 - Intake Air Temperature (IAT) Sensor Circuit ( Voltage High, Low Temp)
DTC 24 - Vehicle Speed Sensor (VSS) Circuit
DTC 25 - Intake Air Temperature (IAT) Sensor Circuit ( Voltage Low, High Temp)
DTC 26 - Evaporative Emission (EVAP) Canister Purge Solenoid Valve Circuit
DTC 27 - Exhaust Gas Recirculation (EGR) Vacuum Control Signal Solenoid Valve Circuit
DTC 28 - Transmission Range (TR) Pressure Switch Assembly Fault
DTC 29 - Secondary Air Injection (AIR) Pump Circuit
DTC 32 - Exhaust Gas Recirculation (EGR)
DTC 33 - Manifold Absolute Pressure (MAP) Sensor Circuit ( Voltage High - Low Vacuum)
DTC 34 - Manifold Absolute Pressure (MAP) Sensor Circuit ( Voltage Low - High Vacuum)
DTC 36 - Distributor Ignition System (Faulty High Res. or Extra Low Res. Pulse Detected)
DTC 37 - Brake Switch Stuck "ON
DTC 38 - Brake Switch Stuck "OFF
DTC 41 - Ignition Control (IC) Circuit (Open Circuit)
DTC 42 - Ignition Control (IC) Circuit (Shorted or Grounded Circuit)
DTC 43 - Knock Sensor (KS) Circuit
DTC 44 - Bank 1 (Left) Heated Oxygen Sensor (HO2S) Circuit (Lean Exhaust Indicated)
DTC 45 - Bank 1 (Left) Heated Oxygen.Sensor (HO2S) Circuit (Rich Exhaust Indicated)
DTC 46 - PASS-Key Circuit
DTC 47 - Knock Sensor (KS) Circuit or Module Missing
DTC 48 - Mass Air Flow (MAF) Sensor Circuit
DTC 50 - System Voltage Low
DTC 51 - EEPROM Programming Error
DTC 53 - System Voltage High
DTC 55 - Fuel Lean Monitor
DTC 58 - Transmission Fluid Temperature (TFT) Sensor Circuit Low (High Temp )
DTC 59 - Transmission Fluid Temperature (Low Temperature Indicated)
DTC 61 - A/C System Performance
DTC 63 - Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Open Circuit)
DTC 64 - Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Lean Exhaust Indicated)
DTC 65 - Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Rich Exhaust Indicated)
DTC 66 - A/C Refrigerant Pressure Sensor Circuit (Open or Shorted)
DTC 67 - A/C Refrigerant Pressure Sensor Circuit (Pressure Sensor Activity)
DTC 68 - A/C Relay Circuit (Shorted Circuit)
DTC 69 - A/C Clutch Circuit
DTC 70 - A/C Clutch Relay Driver Circuit
DTC 71 - A/C Evaporator Temperature Sensor Circuit
DTC 72 - Vehicle Speed Sensor Loss
DTC 73 - Pressure Control Solenoid (PCS) Circuit (Current Error)
DTC 74 - Traction Control System(TCS)CircuitLow
DTC 75 - Transmission System Voltage Low
DTC 77 - Cooling Fan Relay Control Circuit
DTC 78 - Fan control PCM terminal A10
DTC 79 - Transmission Fluid Overtemp
DTC 80 - Transmission Component slipping
DTC 81 - Transmission 2- 3 Shift Solenoid Circuit
DTC 82 - Transmission 1-2 Shift Solenoid Circuit
DTC 83 - Reverse Inhibit System (Manual Transmission)
<<<<<<<<<select>>>>>>
DTC 83 - TCC/PWM (Auto Trans)
DTC 84 - Automatic Transmission 3-2 Control Solenoid Circuit
<<<select>>>>>>
DTC 84 - Skip Shift Solenoid Circuit (Manual Transmission Only)
DTC 85 - Transmission TCC Stuck "ON
DTC 90 - Transmission TCC Solenoid Circuit
DTC 91 - Skip Shift Lamp Circuit
DTC 97 - VSS Output Circuit
DTC 99 - Tach Output Circuit
1994 & 1995 OBDI LT1 DTC's:
DTC 11 - Malfunction Indicator Lamp (MIL) Circuit
DTC 13 - Bank I (Left) Heated Oxygen Sensor (HO2S) Circuit (Open Circuit)
DTC 14 - Engine Coolant Temperature (ECT) Sensor Circuit ( Voltage Low, High Temp)
DTC 15 - Engine Coolant Temperature (ECT) Sensor Circuit ( Voltage High, Low Temp)
DTC 16 - Distributor Ignition System (Low Resolution Pulse)
DTC 18 - Injector Circuit(s)
DTC 21 - Throttle Position (TP) Sensor Circuit (Signal Voltage High)
DTC 22 - Throttle Position (TP) Sensor Circuit (Signal Voltage Low)
DTC 23 - Intake Air Temperature (IAT) Sensor Circuit ( Voltage High, Low Temp)
DTC 24 - Vehicle Speed Sensor (VSS) Circuit
DTC 25 - Intake Air Temperature (IAT) Sensor Circuit ( Voltage Low, High Temp)
DTC 26 - Evaporative Emission (EVAP) Canister Purge Solenoid Valve Circuit
DTC 27 - Exhaust Gas Recirculation (EGR) Vacuum Control Signal Solenoid Valve Circuit
DTC 28 - Transmission Range (TR) Pressure Switch Assembly Fault
DTC 29 - Secondary Air Injection (AIR) Pump Circuit
DTC 32 - Exhaust Gas Recirculation (EGR)
DTC 33 - Manifold Absolute Pressure (MAP) Sensor Circuit ( Voltage High - Low Vacuum)
DTC 34 - Manifold Absolute Pressure (MAP) Sensor Circuit ( Voltage Low - High Vacuum)
DTC 36 - Distributor Ignition System (Faulty High Res. or Extra Low Res. Pulse Detected)
DTC 37 - Brake Switch Stuck "ON
DTC 38 - Brake Switch Stuck "OFF
DTC 41 - Ignition Control (IC) Circuit (Open Circuit)
DTC 42 - Ignition Control (IC) Circuit (Shorted or Grounded Circuit)
DTC 43 - Knock Sensor (KS) Circuit
DTC 44 - Bank 1 (Left) Heated Oxygen Sensor (HO2S) Circuit (Lean Exhaust Indicated)
DTC 45 - Bank 1 (Left) Heated Oxygen.Sensor (HO2S) Circuit (Rich Exhaust Indicated)
DTC 46 - PASS-Key Circuit
DTC 47 - Knock Sensor (KS) Circuit or Module Missing
DTC 48 - Mass Air Flow (MAF) Sensor Circuit
DTC 50 - System Voltage Low
DTC 51 - EEPROM Programming Error
DTC 53 - System Voltage High
DTC 55 - Fuel Lean Monitor
DTC 58 - Transmission Fluid Temperature (TFT) Sensor Circuit Low (High Temp )
DTC 59 - Transmission Fluid Temperature (Low Temperature Indicated)
DTC 61 - A/C System Performance
DTC 63 - Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Open Circuit)
DTC 64 - Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Lean Exhaust Indicated)
DTC 65 - Bank 2 (Right) Heated Oxygen Sensor (HO2S) Circuit (Rich Exhaust Indicated)
DTC 66 - A/C Refrigerant Pressure Sensor Circuit (Open or Shorted)
DTC 67 - A/C Refrigerant Pressure Sensor Circuit (Pressure Sensor Activity)
DTC 68 - A/C Relay Circuit (Shorted Circuit)
DTC 69 - A/C Clutch Circuit
DTC 70 - A/C Clutch Relay Driver Circuit
DTC 71 - A/C Evaporator Temperature Sensor Circuit
DTC 72 - Vehicle Speed Sensor Loss
DTC 73 - Pressure Control Solenoid (PCS) Circuit (Current Error)
DTC 74 - Traction Control System(TCS)CircuitLow
DTC 75 - Transmission System Voltage Low
DTC 77 - Cooling Fan Relay Control Circuit
DTC 78 - Fan control PCM terminal A10
DTC 79 - Transmission Fluid Overtemp
DTC 80 - Transmission Component slipping
DTC 81 - Transmission 2- 3 Shift Solenoid Circuit
DTC 82 - Transmission 1-2 Shift Solenoid Circuit
DTC 83 - Reverse Inhibit System (Manual Transmission)
<<<<<<<<<select>>>>>>
DTC 83 - TCC/PWM (Auto Trans)
DTC 84 - Automatic Transmission 3-2 Control Solenoid Circuit
<<<select>>>>>>
DTC 84 - Skip Shift Solenoid Circuit (Manual Transmission Only)
DTC 85 - Transmission TCC Stuck "ON
DTC 90 - Transmission TCC Solenoid Circuit
DTC 91 - Skip Shift Lamp Circuit
DTC 97 - VSS Output Circuit
DTC 99 - Tach Output Circuit
Le Mans Master
Joined: Feb 2002
Posts: 7,858
Likes: 2
I also found this alternate explanation for DTC 72:
DTC 72: Transmission output speed changed more than 1000 RPM for 2 seconds when vehicle was in gear, or transmission output speed changed more than 2048 RPM when vehicle was in park or neutral.
I'm not sure if this means the trans experienced excessive slippage for a moment, or what. I get DTC 72 for some reason sometimes when I hook up something to my ALDL; used to happen after I hooked up a Hypertech Power Programmer Plus, sold that, and the other day I had DTC 72 after I unhooked the laptop from the ALDL that I had Datamster running on logging some data while driving. Weird.
The Hypertech also used to cause a DTC 64 along with the DTC 72, usually got them only right after disconnecting the Hypertech after it finished programming. Weird.
DTC 72: Transmission output speed changed more than 1000 RPM for 2 seconds when vehicle was in gear, or transmission output speed changed more than 2048 RPM when vehicle was in park or neutral.
I'm not sure if this means the trans experienced excessive slippage for a moment, or what. I get DTC 72 for some reason sometimes when I hook up something to my ALDL; used to happen after I hooked up a Hypertech Power Programmer Plus, sold that, and the other day I had DTC 72 after I unhooked the laptop from the ALDL that I had Datamster running on logging some data while driving. Weird.
The Hypertech also used to cause a DTC 64 along with the DTC 72, usually got them only right after disconnecting the Hypertech after it finished programming. Weird.
Thread Starter
Drifting
Joined: Jun 2002
Posts: 1,305
Likes: 11
From: Savannah Ga.
Originally Posted by Lone Ranger
I also found this alternate explanation for DTC 72:
DTC 72: Transmission output speed changed more than 1000 RPM for 2 seconds when vehicle was in gear, or transmission output speed changed more than 2048 RPM when vehicle was in park or neutral.
I'm not sure if this means the trans experienced excessive slippage for a moment, or what. I get DTC 72 for some reason sometimes when I hook up something to my ALDL; used to happen after I hooked up a Hypertech Power Programmer Plus, sold that, and the other day I had DTC 72 after I unhooked the laptop from the ALDL that I had Datamster running on logging some data while driving. Weird.
The Hypertech also used to cause a DTC 64 along with the DTC 72, usually got them only right after disconnecting the Hypertech after it finished programming. Weird.
DTC 72: Transmission output speed changed more than 1000 RPM for 2 seconds when vehicle was in gear, or transmission output speed changed more than 2048 RPM when vehicle was in park or neutral.
I'm not sure if this means the trans experienced excessive slippage for a moment, or what. I get DTC 72 for some reason sometimes when I hook up something to my ALDL; used to happen after I hooked up a Hypertech Power Programmer Plus, sold that, and the other day I had DTC 72 after I unhooked the laptop from the ALDL that I had Datamster running on logging some data while driving. Weird.
The Hypertech also used to cause a DTC 64 along with the DTC 72, usually got them only right after disconnecting the Hypertech after it finished programming. Weird.
thanks
