OBD I Codes

[jeffjbar]

OBD I Codes

DTC 12 - No Codes Present
DTC 13 - Engine Shutoff Solenoid Circuit Fault
DTC 14 - Engine Coolant Temperature (ECT) Sensor Circuit Low (High Temp)
DTC 15 - Engine Coolant Temperature (ECT) Sensor Circuit High (Low Temp)
DTC 16 - Vehicle Speed Sensor Buffer Fault
DTC 17 - High Resolution Circuit Fault
DTC 18 - Pump Cam Reference Pulse Error
DTC 19 - Crankshaft Position Reference Error
DTC 21 - Accelerator Pedal Position 1 Circuit High
DTC 22 - Accelerator Pedal Position 1 Circuit Low
DTC 23 - Accelerator Pedal Position 1 Circuit Range Fault
DTC 24 - Vehicle Speed Sensor Circuit Low (Output Speed Signal)
DTC 25 - Accelerator Pedal Position 2 Circuit High
DTC 26 - Accelerator Pedal Position 2 Circuit Low
DTC 27 - Accelerator Pedal Position 2 Circuit Range Fault
DTC 28 - Transmission Range Pressure Switch Circuit
DTC 29 - Glow Plug Relay Fault
DTC 31 - EGR Control Pressure/Baro Sensor Circuit Low (High Vacuum)
DTC 32 - EGR Circuit Error
DTC 33 - EGR Control Pressure/Baro Sensor Circuit High
DTC 34 - Injection Timing Stepper Motor Fault
DTC 35 - Injection Pulse Width Error (Time Short)
DTC 36 - Injection Pulse Width Error (Time Long)
DTC 37 - TCC Brake Switch Stuck "ON"
DTC 38 - TCC Brake Switch Stuck "OFF"
DTC 39 - TCC Stuck "OFF"
DTC 41 - Brake Switch Circuit Fault
DTC 42 - Fuel Temperature Circuit Low (High Temp)
DTC 43 - Fuel Temperature Circuit High (Low Temp)
DTC 44 - EGR Pulse Width Error
DTC 45 - EGR Vent Error
DTC 46 - Malfunction Indicator Lamp (MIL) Circuit Fault
DTC 47 - Intake Air Temperature Sensor Circuit Low (High Temp )
DTC 48 - Intake Air Temperature Sensor Circuit High (Low Temp )
DTC 49 - Service Throttle Soon Lamp Circuit Fault
DTC 51 - PROM Error
DTC 52 - System Voltage High Long
DTC 53 - System Voltage High
DTC 54 - PCM fuel circuit error
DTC 56 - Injection Pump Calibration Resistor Error
DTC 57 - PCM 5 Volt Shorted
DTC 58 - Transmission Fluid Temp Circuit Low
DTC 59 - Transmission Fluid Temp Circuit High
DTC 61 - Turbo Boost Sensor Circuit High
DTC 62 - Turbo Boost Sensor Circuit Low
DTC 63 - Accelerator Pedal Position 3 Circuit High
DTC 64 - Accelerator Pedal Position 3 Circuit Low
DTC 65 - Accelerator Pedal Position 3 Circuit Range Fault
DTC 66 - 3-2 Shift Control Solenoid
DTC 67 - TCC Solenoid Circuit (Open or Short)
DTC 68 - Transmission Component Slipping
DTC 69 - TCC Stuck "ON"
DTC 71 - Set/Coast Switch Fault (Cruise Control)
DTC 72 - Vehicle Speed Sensor Circuit Loss (Output Speed Signal)
DTC 73 - Pressure Control Solenoid Circuit (Current Error)
DTC 74 - Transmission Input Speed (TIS) Sensor Circuit
DTC 75 - System Voltage Low
DTC 76 - Resume/Accel Switch Fault (Cruise Control)
DTC 78 - Turbo Wastegate Solenoid Fault
DTC 79 - Transmission Fluid Over Temperature
DTC 81 - Transmission 2-3 Shift Solenoid Circuit
DTC 82 - Transmission 1-2 Shift Solenoid Circuit
DTC 83 - Torque Converter Clutch
DTC 85 - Transmission Gear
DTC 86 - Transmission Gear Ratio Error
DTC 87 - Transmission Gear Ratio Error
DTC 88 - Top Dead Center Offset Problem
DTC 91 thru 98 - Cylinder Balance
DTC 99 - Accelerator Pedal Position Sensor 5-Volt Reference Problem

 

[94K30]

how can you clear old codes?

 

[jeffjbar]

You can clear the codes by pressing the brake and accelerator pedals fully while terminals A and B connected.

 

[Chevylover]

You can clear the codes by pressing the brake and accelerator pedals fully while terminals A and B connected.

And also by disconnecting both battery cables for about 30 minutes.

Cu,
Sven

 

[94K30]

Thanks, guys.....

 

[Suburban K2500]

can these be moved to the front??? Sticky maybe

 

[jbsaxman]

The easiest way to clear codes is to remove the fuse for ECM for 30 seconds. Done it several times and checked several times with a scanner to make sure that it cleared the code. (This recommendation is per the Chilton manual)

 

[JiFaire]

I'm gonna add a slightly different description and diagram...

Under your steering column, you have an ALDL plug that looks like the attached picture. With the key off, take a metal paper clip (or another suitable jumper wire) and place the ends in holes A and B. Get a piece of paper and pencil handy, watch the SES light on your dash (beside the speedometer), and turn the key to the ON position. The SES light should start flashing.

flash-(pause)-flash-flash-(long pause) ... that's a code 12. Means it is about to start sending you codes. It will end with a code 12, too.

everything in between the 12's on each end will be repeated 3 times. Write them down as they come up. For instance, you could get:

12-17-18-35-36-71-12

That means you have codes 17, 18, 35, 36, and 71

When you're done, and the codes are all written down, clear them by pushing the brake and accelerator pedals to the floor, hold them for 15 seconds, let them up, push them down again, hold, and turn the key off.

Turning the key on again should get you only a repeating code 12 (all is well).

Shut the key off, remove the jumper.

NEVER put the jumper in or take it out with the key on!!

 

[Schwind]

JiFaire
Have to contribute to your scenario. Because my 94 doesn’t throw the 12 code if I have DTC’s. It begins with the first code in the series of codes or the one code that it gives. If I look for DTC’s and there are none then I get the code 12 in repeat only. I have also read others scenarios where they didn’t get the code 12 as well when other codes were present. Just wanted to say that with DTC’s present you may not start with code 12.

 

[kane]

Should someone fix G pin location in the first mail picture?
Fuel Prime G pin is correctly in JiFaire's picture (ALDL)

br.kane

 

[Pruittx2]

JiFaire
Have to contribute to your scenario. Because my 94 doesn’t throw the 12 code if I have DTC’s. It begins with the first code in the series of codes or the one code that it gives. If I look for DTC’s and there are none then I get the code 12 in repeat only. I have also read others scenarios where they didn’t get the code 12 as well when other codes were present. Just wanted to say that with DTC’s present you may not start with code 12.

I'll second that,, my 94 also see's no code 12 when others are present.

Maybe its just a 94 thing.rrr: