Diagnostic Trouble Codes (DTCs)
Chassis Codes

for OBD II (OBD-2) equipped GM vehicles

Compiled by Anthony W. Haukap
http://www.cyberspace.org/~awh/

Diagnostic Trouble Codes for OBD II (OBD2) equipped General Motors (GMC, Chevrolet, Buick, Oldsmobile, Cadillac, Pontiac, Saturn) vehicles.

Updated through the 2004 model year.

Master Index



Go HomeIdentifing OBD-II equipped carsGo Top

All cars and light trucks built and sold in the United States after January 1, 1996 were required to be OBD II equipped. In general, this means all 1996 model year cars and light trucks are compliant, even if built in late 1995. Some 1995 model year vehicles are also equipped with OBDII - although some pre-1996 OBD-II cars are not 100% compliant. Pre-OBD-II cars had connectors in various positions under the dashboard and under the hood. All OBD-II cars have a connector located in the passenger compartment easily accessible from the driver's seat.



Go HomeCommunications ProtocolsGo Top

GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation). There are some variations among imports such as the Cadillac Catera, which is a German Opel derivative, the Catera uses the European ISO 9141 protocol.



Go HomeReading OBD-II codesGo Top

A cable is plugged into the OBD-II J1962 connector and the other end is connected to a scan tool. A hand-held scan tool is usually limited to one OBD-II system type - there are three basic OBD-II protocols in use, each with minor variations on the communication pattern between the on-board diagnostic computer and the scan tool. In general, Chrysler products and all European and most Asian imports use ISO 9141 circuitry. GM cars and light trucks use SAE J1850 VPW (Variable Pulse Width Modulation), and Fords use SAE J1850 PWM (Pulse Width Modulation) for communication.



Go HomeGeneral Motors Driving CycleGo Top

A complete driving cycle will perform diagnostics on all monitored systems and can usually be completed in less than fifteen minutes.

    Performing a GM OBDII Driving cycle:
    1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run.
    2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.
    3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
    4. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
    5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
    6. Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
    7. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
    8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.



Go HomeDisecting a DTCGo Top

How the Diagnostic Trouble Code is created: A DTC is made up of 5 digits. The chart below shows the composition of a DTC. With this information you can easily determine what system to trouble shoot without knowing the exact description of the code.

                       X  X  X  X X
                 |  |  |   |
                 |  |  |   |
B Body ----------+  |  |   +-- Fault (00 to 99)
C Chassis -------+  |  |
P Powertrain ----+  |  |
U Network -------+  |  +------ 1 Fuel & Air Metering
                    |  +------ 2 Fuel & Air Metering (Injector)
                    |  +------ 3 Ignition System or Misfire
0 SAE --------------+  +------ 4 Auxiliary Emission Controls
1 MFG --------------+  +------ 5 Vehicle Speed & Idle Control System
                       +------ 6 Computer Output Citcuit
                       +------ 7 Transmission
                       +------ 8 Transmission
                       +------ 9 Reserved
                       +------ 0 Reserved

Using the Cadillac on-board diagnostic display you'll also see "IP" for the IPC instrument panel, "AC" for the air conditioning module, "TC" for traction control, "RS" for the road suspension system, "SD" for the air bags, "PZ" for the body control module, "CC" for the cell phone and "RF" for the integrated radio.



Go HomeTypes of DTCsGo Top

There are two categories of DTC's that apply to OBDII.

    Type A
    1. Emissions related.
    2. Requests illumination of the MIL after one failed driving cycle.
    3. Stores a freeze frame DTC after one failed driving cycle.
    Type B
    1. Emissions related.
    2. Sets a Pending Trouble Code after one failed driving cycle.
    3. Clears a Pending Trouble Code after one successful driving cycle.
    4. Turns on the MIL after two consecutive failed driving cycles.
    5. Stores a freeze frame after two consecutive failed driving cycles.



Go HomeGM Diagnostic Trouble Code ListGo Top


Obtained from: http://www.cyberspace.org/~awh/
Go HomeCHASSIS CODES:Go Top

  • C0000 - Vehicle Speed Information Circuit Malfunction
  • C0035 - Left Front Wheel Speed Circuit Malfunction
  • C0040 - Right Front Wheel Speed Circuit Malfunction
  • C0041 - Right Front Wheel Speed Sensor Circuit Range/Performance (EBCM)
  • C0045 - Left Rear Wheel Speed Circuit Malfunction
  • C0046 - Left Rear Wheel Speed Sensor Circuit Range/Performance (EBCM)
  • C0050 - Right Rear Wheel Speed Circuit Malfunction
  • C0051 - LF Wheel Speed Sensor Circuit Range/Performance (EBCM)
  • C0060 - Left Front ABS Solenoid #1 Circuit Malfunction
  • C0065 - Left Front ABS Solenoid #2 Circuit Malfunction
  • C0070 - Right Front ABS Solenoid #1 Circuit Malfunction
  • C0075 - Right Front ABS Solenoid #2 Circuit Malfunction
  • C0080 - Left Rear ABS Solenoid #1 Circuit Malfunction
  • C0085 - Left Rear ABS Solenoid #2 Circuit Malfunction
  • C0090 - Right Rear ABS Solenoid #1 Circuit Malfunction
  • C0095 - Right Rear ABS Solenoid #2 Circuit Malfunction
  • C0110 - Pump Motor Circuit Malfunction
  • C0121 - Valve Relay Circuit Malfunction
  • C0128 - Low Brake Fluid Circuit Low
  • C0141 - Left TCS Solenoid #1 Circuit Malfunction
  • C0146 - Left TCS Solenoid #2 Circuit Malfunction
  • C0151 - Right TCS Solenoid #1 Circuit Malfunction
  • C0156 - Right TCS Solenoid #2 Circuit Malfunction
  • C0161 - ABS/TCS Brake Switch Circuit Malfunction
  • C0221 - Right Front Wheel Speed Sensor Circuit Open
  • C0222 - Right Front Wheel Speed Signal Missing
  • C0223 - Right Front Wheel Speed Signal Erratic
  • C0225 - Left Front Wheel Speed Sensor Circuit Open
  • C0226 - Left Front Wheel Speed Signal Missing
  • C0227 - Left Front Wheel Speed Signal Erratic
  • C0229 - Drop Out of Front Wheel Speed Signals
  • C0235 - Rear Wheel Speed Signal Circuit Open
  • C0236 - Rear Wheel Speed Signal Circuit Missing
  • C0237 - Rear Wheel Speed Signal Erratic
  • C0238 - Wheel Speed Mismatch
  • C0241 - EBCM Control Valve Circuit
  • C0245 - Wheel Speed Sensor Frequency Error
  • C0254 - EBCM Control Valve Circuit
  • C0265 - EBCM Relay Circuit
  • C0266 - EBCM Relay Circuit
  • C0267 - Pump Motor Circuit Open/Shorted
  • C0268 - Pump Motor Circuit Open/Shorted
  • C0269 - Excessive Dump/Isolation Time
  • C0271 - EBCM Malfunction
  • C0272 - EBCM Malfunction
  • C0273 - EBCM Malfunction
  • C0274 - Excessive Dump/Isolation Time
  • C0279 - Powertrain Configuration Not Valid
  • C0281 - Brake Switch Circuit
  • C0283 - Traction Switch Shorted to Ground
  • C0284 - EBCM Malfunction
  • C0286 - ABS Indicator Lamp Circuit Shorted to B+
  • C0287 - Delivered Torque Circuit
  • C0288 - Brake Warning Lamp Circuit Shorted to B+
  • C0290 - Lost Communications With PCM
  • C0292 - Lost Communications With PCM
  • C0291 - Lost Communications With BCM
  • C0297 - Powertrain Configuration Data Not Received
  • C0298 - Powertrain Indicated Traction Control Malfunction
  • C0300 - Rear Speed Sensor Malfunction
  • C0305 - Front Speed Sensor Malfunction
  • C0306 - Motor A or B Circuit
  • C0308 - Motor A/B Circuit Low
  • C0309 - Motor A/B Circuit High
  • C0310 - Motor A/B Circuit Open
  • C0315 - Motor Ground Circuit Open
  • C0321 - Transfer Case Lock Circuit
  • C0323 - T-Case Lock Circuit Low
  • C0324 - T-Case Lock Circuit High
  • C0327 - Encoder Circuit Malfunction
  • C0357 - Park Switch Circuit High
  • C0359 - Four Wheel Drive Low Range (4LO) Discrete Output Circuit
  • C0362 - 4LO Discrete Output Circuit High
  • C0367 - Front Axle Control Circuit High
  • C0374 - General System Malfunction
  • C0376 - Front/Rear Shaft Speed Mismatch
  • C0379 - Front Axle System
  • C0387 - Unable to Perform Shift
  • C0472 - Steering Handwheel Speed Sensor Signal V Low
  • C0473 - Steering Handwheel Speed Sensor Signal V High
  • C0495 - EVO Tracking Error
  • C0498 - Steering Assist Control Actuator Feed Circuit Low
  • C0499 - Steering Assist Control Solenoid Feed Circuit High
  • C0503 - Steering Assist Control Solenoid Return Circuit Low
  • C0504 - Steering Assist Control Solenoid Return Circuit High
  • C0550 - ECU Malfunction - internal write / checksum malfunction
  • C0559 - EEPROM Checksum Error
  • C0563 - Calibration ROM Checksum Error
  • C0577 - Left Front Solenoid Circuit Low
  • C0578 - Left Front Solenoid Circuit High
  • C0579 - Left Front Solenoid Circuit Open
  • C0582 - Right Front Solenoid Circuit Low
  • C0583 - Right Front Solenoid Circuit High
  • C0584 - Right Front Solenoid Circuit Open
  • C0587 - Left Rear Solenoid Circuit Low
  • C0588 - Left Rear Solenoid Circuit High
  • C0589 - Left Rear Solenoid Circuit Open
  • C0592 - Right Rear Solenoid Circuit Low
  • C0593 - Right Rear Solenoid Circuit High
  • C0594 - Right Rear Solenoid Circuit Open
  • C0611 - VIN Information Error
  • C0615 - Left Front Position Sensor Malfunction
  • C0620 - Right Front Position Sensor Malfunction
  • C0625 - Left Rear Position Sensor Malfunction
  • C0628 - Level Control Position Sensor Circuit High
  • C0630 - Right Rear Position Sensor Malfunction
  • C0635 - Left Front Normal Force Circuit Malfunction
  • C0638 - Left Front Normal Force Circuit High
  • C0640 - Right Front Normal Force Circuit Malfunction
  • C0643 - Right Front Normal Force Circuit High
  • C0655 - Level Control Compressor Relay Malfunction
  • C0657 - Level Control Compressor Circuit Low
  • C0658 - Level Control Compressor Circuit High
  • C0660 - Level Control Exhaust Valve Circuit Malfunction
  • C0662 - Level Control Exhaust Valve Circuit Low
  • C0663 - Level Control Exhaust Valve Circuit High
  • C0665 - Chassis Pitch Signal Circuit
  • C0690 - Damper Control Relay Circuit Malfunction
  • C0691 - Damper Control Relay Circuit Range
  • C0693 - Damper Control Relay Circuit High
  • C0695 - Position Sensor Overcurrent (8 volt supply)
  • C0696 - Position Sensor Overcurrent (5 volt supply)
  • C0710 - Steering Position Signal Malfunction
  • C0750 - Tire Pressure Monitor (TPM) system sensor not transmitting
  • C0755 - Tire Pressure Monitor (TPM) system sensor not transmitting
  • C0760 - Tire Pressure Monitor (TPM) system sensor not transmitting
  • C0765 - Tire Pressure Monitor (TPM) system sensor not transmitting
  • C0800 - Device Power #1 Circuit Malfunction
  • C0896 - Electronic Suspension Control (ESC) voltage is outside the normal range of 9 to 15.5 volts
  • C1211 - ABS Indicator Lamp Circuit Malfunction
  • C1214 - System Relay Contact or Coil Circuit Open
  • C1217 - Pump Motor Shorted to Ground
  • C1218 - Pump Motor Circuit Shorted to Voltage or Motor Ground Open
  • C1221 - Left Front Wheel Speed Sensor Input Signal is 0
  • C1222 - Right Front Wheel Speed Sensor Input Signal is 0
  • C1223 - Left Rear Wheel Speed Sensor Input Signal is 0
  • C1224 - Right Rear Wheel Speed Sensor Input Signal is 0
  • C1225 - Left Front Excessive Wheel Speed Variation
  • C1226 - Right Front Excessive Wheel Speed Variation
  • C1227 - Left Rear Excessive Wheel Speed Variation
  • C1228 - Right Rear Excessive Wheel Speed Variation
  • C1232 - Left Front Wheel Speed Circuit Open or Shorted
  • C1233 - Right Front Wheel Speed Circuit Open or Shorted
  • C1234 - Left Rear Wheel Speed Circuit Open or Shorted
  • C1235 - Right Rear Wheel Speed Circuit Open or Shorted
  • C1236 - Low System Supply Voltage
  • C1237 - High System Supply Voltage
  • C1238 - Brake Thermal Model Exceeded
  • C1241 - Variable Effort Steering Circuit Malfunction
  • C1242 - Pump Motor Circuit Open
  • C1243 - BPMV Pump Motor Stalled
  • C1244 - Powertrain Indicated Engine Drag Control Malfunction
  • C1246 - Brake Lining Wear Circuit Open
  • C1248 - EBCM Turned the Red Brake Warning Indicator On
  • C1251 - RSS Indicated Malfunction
  • C1252 - Left Front Normal Force Malfunction
  • C1253 - Right Front Normal Force Malfunction
  • C1254 - Abnormal Shutdown Detected
  • C1255 - EBCM Internal Malfunction
  • C1256 - EBCM Internal Malfunction
  • C1261 - Left Front Inlet Valve Solenoid Malfunction
  • C1262 - Left Front Outlet Valve Solenoid Malfunction
  • C1263 - Right Front Inlet Valve Solenoid Malfunction
  • C1264 - Right Front Outlet Valve Solenoid Malfunction
  • C1265 - Left Rear Inlet Valve Solenoid Malfunction
  • C1266 - Left Rear Outlet Valve Solenoid Malfunction
  • C1267 - Right Rear Inlet Valve Solenoid Malfunction
  • C1268 - Right Rear Outlet Valve Solenoid Malfunction
  • C1271 - Left Front TCS Master Cylinder Isolation Valve Malfunction
  • C1272 - Left Front TCS Prime Valve Malfunction
  • C1273 - Right Front TCS Master Cylinder Isolation Valve Malfunction
  • C1274 - Right Front TCS Prime Valve Malfunction
  • C1276 - Delivered Torque Signal Circuit Malfunction
  • C1277 - Requested Torque Signal Circuit Malfunction
  • C1278 - TCS Temporarily Inhibited By PCM
  • C1281 - VSES Sensors Uncorrelated
  • C1282 - Yaw Rate Sensor Bias Circuit Malfunction
  • C1283 - Excessive Time to Center Steering
  • C1284 - Lateral Accelerometer Sensor Bias Malfunction
  • C1285 - Lateral Accelerometer Sensor Circuit Malfunction
  • C1286 - Steering Sensor Bias Malfunction
  • C1287 - Steering Sensor Rate Malfunction
  • C1288 - Steering Sensor Circuit Malfunction
  • C1291 - Open Brake Lamp Switch Contacts During Deceleration
  • C1292 - Brake Fluid Pressure Sensor Circuit
  • C1293 - Code C1291 Set in Previous Ignition Cycle
  • C1294 - Brake Lamp Switch Circuit Always Active
  • C1295 - Brake Lamp Switch Circuit Open
  • C1296 - Brake Fluid Pressure Sensor Circuit
  • C1297 - PCM Indicated Brake Extended Travel Switch Failure
  • C1298 - PCM Class 2 Serial Data Link Malfunction
  • C1326 - Battery Out of Range
  • C1650 - RSS Control Module Fault
  • C1658 - RSS Control Module Calibration Fault
  • C1710 - Left Front Damper Actuator Short Circuit to Battery
  • C1711 - Left Front Damper Actuator Short Circuit to Ground
  • C1712 - Left Front Damper Actuator Open Circuit
  • C1715 - Right Front Damper Actuator Short Circuit to Battery
  • C1716 - Right Front Damper Actuator Short Circuit to Ground
  • C1717 - Right Front Damper Actuator Open Circuit
  • C1720 - Left Rear Damper Actuator Short Circuit to Battery
  • C1721 - Left Rear Damper Actuator Short Circuit to Ground
  • C1722 - Left Rear Damper Actuator Open Circuit
  • C1725 - Right Rear Damper Actuator Short Circuit to Battery
  • C1726 - Right Rear Damper Actuator Short Circuit to Ground
  • C1727 - Right Rear Damper Actuator Open Circuit
  • C1735 - Compressor Relay Short to Battery
  • C1736 - Compressor Relay Short to GND/Open Circuit
  • C1737 - Exhaust Solenoid Valve Short to Battery
  • C1738 - Exhaust Solenoid Valve Short to GND
  • C1743 - Speed Signal Fault
  • C1744 - Lift/Dive Signal Discrete Fault
  • C1760 - Left Front Position Sensor Input Fault
  • C1761 - Right Front Position Sensor Input Fault
  • C1762 - Left Rear Position Sensor Input Fault
  • C1763 - Right Rear Position Sensor Input Fault
  • C1768 - Position Sensor Supply Fault
  • C1780 - Loss of Steering Position Signal
  • C1782 - ICCS2 DL Left Output Short Circuit to Bat
  • C1783 - ICCS2 DL Left Output Short Circuit to GND
  • C1784 - ICCS2 DL Right Output Short Circuit to Bat
  • C1785 - ICCS2 DL Right Output Short Circuit to GND
  • C1786 - Damper Control Relay Fault
  • C1787 - Damper Control Relay Short to GND
  • C1788 - Damper Control Relay Short to Bat



Go HomeMore GM Diagnostic Trouble CodesGo Top



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