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All Trac / GT-four Error Codes

Ok, so your check engine light came on.  You have opened the hood and checked that it is still there.  Now what do you do??

Test Procedure:

  • Locate diagnostic box (small black box marked diag)

  • Turn Car Off

  • Use a wire or paper clip and insert ends into TE1 and E1

  • Turn key to on position

  • Check number of blinks of Check Engine Light

  • Each "set" of blinks separated by a pause is a number. 

  • Ex:  5 blinks, a pause, then 4 blinks would be 54.

  • There will be a longer pause in between each code.

  • Refer to the chart below.

  • The ECU remembers old codes, so to erase them remove the negative cable from the battery for 30 seconds.

  • A Constant steady blinking is normal operation

  • After clearing the codes, test drive the car again, then check for more codes.

*Common error code fixes are in bolt print

Code Description What to do?
     
11 - ECU Momentary interrupt in power Check relays, IG switch
12 - RPM No "G" signal to ECU for 2 sec after crank Starting related, check distributor, starter
13 - RPM No "NE" signal to ECU above 1000 RPM Check distributor
14 - IGN No "IGF" signal to ECU 8-11 times Check Igniter, ignition coil
21 - O2 Detection of oxygen sensor detoriation Check oxygen sensor
21 - O2 Open or short circuit in o2 sensor heater Check oxygen sensor
22 - WTR Open or short in Water Temp Sensor Check Water Temp Sensor
24 - AIR Open or short circuit in Air Temp Sensor Check Air Temp Sensor
25 - O2 Excessive Lean Air Fuel Ratio Check o2 sensor and fuel system
26 - O2 Excessive Rich Air Fuel Ratio Check o2 sensor and fuel system
31 - AFM Open circuit or short in VC signal Test or replace Air flow Meter
32 - AFM Open circuit or short in E2 signal Test or replace Air flow Meter
34 - TRB Fuel cut due to excessive turbo pressure Check Wastegate Hose, Test Pressure Sensor
35 - TRB Open or short circuit in Pressure Sensor Test Turbo Pressure Sensor
41 - TPS Open or short circuit in VTA signal Test Throttle Position Sensor
42 - SPD No "SPD" signal over 8 seconds driving Check Vehicle Speed Sensor
43 - STA No "STA" signal over 800 RPM starting Check Ignition Switch
51 - IDL No "IDL" or A/C signal during testing Check TPS, A/C switch, Accelerator cable
52 - KNK Open or short circuit in Knock Sensor Check for broken/brittle wire, Replace Sensor
54 - INT Intercooler Coolant Low or Pump Failure Replace Water Level Sensor, Test IC W. Pump
71 - EGR EGR gas temp below acceptable level Check EGR system, (Valve/VSV/Hose/Temp)
     

 

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We also would like ST185 and ST205 code lists!