Check out this bulletin:

TECHNICAL

Bulletin No.: 08-05-25-003

Date: April 25, 2008
Subject:
ABS Warning Light On, DTC 1200 or 1203 Set (Replace Front ABS Sensor)

Models:
2007-2008 Chevrolet Aveo
2007-2008 Pontiac Wave (Canada Only)

Built Prior to VIN Breakpoint 8B114685

Condition

Some customers may comment that the ABS light is illuminated. Upon investigation the technician may find DTC 1200 (Left Front Wheel Speed Sensor Circuit Open or Shorted) or DTC 1203 (Right Front Wheel Speed Sensor Circuit Open or Shorted) set.

Cause

This condition may be caused by a broken ABS sensor wiring harness.

Correction

Replace the front ABS sensor on affected vehicles. Refer to Front Wheel Speed Sensor Replacement in SI.

Parts Information

Warranty Information

For vehicles repaired under warranty, use the table.

Disclaimer

© 2012 ALLDATA LLC. All rights reserved.
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Answered by Dr. Hagerty (expert)
9,669 answers provided

It's not just that the ABS light is illuminated....the brakes do not work properly when the light comes on. It only happens once a week, or so. I will try replacing the RF wheel speed sensor and reply with the results.

What about all the other codes listed? No suggestions on those?

Thanks!

Response from wakekat
1 question asked

I will look for those codes. Give me a few

Dr. Hagerty

Answered by Dr. Hagerty (expert)
9,669 answers provided

DTC C1201

Circuit Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a DTC to set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1201 Left Front Wheel Speed Circuit Range Performance

Conditions for Running the DTC

Ignition is in the ON position.

Conditions for Setting the DTC

All of the following must be true for DTC C1201 to set:

DTC C1200, C1203, C1206, C1209 not current
Brake switch OFF
The left front wheel speed is accelerating or decelerating beyond reasonable limits.

Action Taken When the DTC Sets

The solenoid relay opens, removing power from the pump motor and solenoids.
DTC C1201 is stored.
ABS disabled, ABS warning lamp turns ON.

Conditions for Clearing the DTC

If the conditions that set the DTC C1201 are no longer present, the DTC may be cleared by using the proper scan tool.
The DTC that has not occurred in 100 drive cycles will be cleared from history data.

Diagnostic Aids

Thoroughly inspect the wiring and connectors when diagnosing intermittent DTCs. This will include the following:

Removal of the protective conduit and inspection of wiring for damage, shorts, and contamination
Inspection for improperly formed and/or damaged terminals
Checking terminal contact retention force by using a spare male/female terminal
Removal of the terminals from the connectors to check for proper terminal to wire crimp

If the driver comments reflect that the ABS warning lamp is ON only during moist environmental changes, such as rain, snow, vehicle wash, the all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. If the DTC is not current, simulate the effects of water intrusion. Use the following procedure. Spray the suspected area with a 5 percent salt-water solution. Then test drive the vehicle over various road surfaces such as bumps, turns, etc., above 24 km/h (15 mph). If the DTC sets then replace the suspected harness and/or sensor.

A careful visual inspection of the wheel speed sensor for damage such as cracks should be performed. If the DTC sets at the same speed every drive cycle, the toothed ring is most likely damaged.

Failure to perform the previous steps carefully and fully can result in misdiagnosis, unnecessary component replacement, and reoccurrence of DTC C1201.

Step 1 - Step 5

Step 6 - Step 10

Step 11 - Step 15

Step 16 - Step 19

© 2012 ALLDATA LLC. All rights reserved.
Terms of Use

Answered by Dr. Hagerty (expert)
9,669 answers provided

DTC C1202

Circuit Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a DTC to set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1202 Left Front Wheel Speed Sensor Input Signal Equals Zero

Conditions for Running the DTC

Ignition is in the ON position.

Conditions for Setting the DTC

All of the following must be true or C1202 to set:

DTC C1200, C1203, C1206, or C1209 not current
ABS not active
Brake switch OFF

The left front wheel speed equals 0, and all of the remaining wheel speed sensors are greater than 8 km/h (5 mph) for at least 2.5 seconds.

Action Taken When the DTC Sets

The solenoid relay opens, removing power from the pump motor and solenoids.
DTC C1202 is stored.
ABS disabled, ABS warning lamp turns ON.

Conditions for Clearing the DTC

If the conditions that set the DTC C1202 are no longer present, the DTC may be cleared by using the proper scan tool.
The DTC that has not occurred in 100 drive cycles will be cleared from history data.

Diagnostic Aids

Thoroughly inspect the wiring and connectors when diagnosing intermittent DTCs. This will include the following:

Removal of the protective conduit and inspection of wiring for damage, shorts, and contamination
Inspection for improperly formed and/or damaged terminals
Checking terminal contact retention force by using a spare male/female terminal
Removal of the terminals from the connectors to check for proper terminal to wire crimp

If the driver comments reflect that the ABS warning lamp is ON only during moist environmental changes, such as rain, snow, vehicle wash, the all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. If the DTC is not current, simulate the effects of water intrusion. Use the following procedure. Spray the suspected area with a 5 percent salt-water solution. Then test drive the vehicle over various road surfaces such as, bumps, turns, etc., above 24 km/h (15 mph). If the DTC sets then replace the suspected harness and/or sensor.

When measuring wheel speed sensor resistance, ensure that the vehicle is room temperature, since resistance will increase with temperature.

Failure to perform the previous steps carefully and fully can result in misdiagnosis, unnecessary component replacement and reoccurrence of DTC C1202.

Step 1 - Step 6

Step 7 - Step 13

Step 14 - Step 18

© 2012 ALLDATA LLC. All rights reserved.
Terms of Use

Answered by Dr. Hagerty (expert)
9,669 answers provided

DTC C1203

Circuit Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a DTC to set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1203 Right Front Wheel Speed Sensor Circuit Open or Shorted

Conditions for Running the DTC

Ignition is in the ON position.

Conditions for Setting the DTC

EBCM has detected an open, short to ground, or a short to battery on the right front wheel speed circuit.

Action Taken When the DTC Sets

The solenoid relay opens, removing power from the pump motor and solenoids.
DTC C1203 is stored.
ABS disabled, ABS warning lamp turns ON.

Conditions for Clearing the DTC

If the conditions that set the DTC C1203 are no longer present, the DTC may be cleared by using the proper scan tool.
The DTC that has not occurred in 100 drive cycles will be cleared from history data.

Diagnostic Aids

Thoroughly inspect the wiring and connectors when diagnosing intermittent DTCs. This will include the following:

Removal of the protective conduit and inspection of wiring for damage, shorts, and contamination
Inspection for improperly formed and/or damaged terminals
Checking terminal contact retention force by using a spare male/female terminal
Removal of the terminals from the connectors to check for proper terminal to wire crimp

If the driver comments reflect that the ABS warning lamp is ON only during moist environmental changes, such as, rain, snow, vehicle wash, the all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. If the DTC is not current, simulate the effects of water intrusion. Use the following procedure. Spray the suspected area with a 5 percent salt-water solution. Then test drive the vehicle over various road surfaces such as, bumps, turns, etc., above 24 km/h (15 mph). If the DTC sets then replace the suspected harness and/or sensor.

When measuring the wheel speed sensor resistance, ensure the vehicle is at room temperature, since resistance will increase with temperature.

Failure to perform the previous steps carefully and fully can result in misdiagnosis, unnecessary component replacement, and reoccurrence of DTC C1203.

Step 1 - Step 6

Step 7 - Step 11

Step 12 - Step 17

Step 18 - Step 23

Step 24

© 2012 ALLDATA LLC. All rights reserved.
Terms of Use

Answered by Dr. Hagerty (expert)
9,669 answers provided

DTC C1204

Circuit Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a DTC to set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1204 Right Front Wheel Speed Circuit Range Performance

Conditions for Running the DTC

Ignition is in the ON position.

Conditions for Setting the DTC

All of the following must be true for DTC C1204 to set:

DTC C1200, C1203, C1206, or C1209 not current
Brake switch OFF
The right front wheel speed is accelerating or decelerating beyond reasonable limits.

Action Taken When the DTC Sets

The solenoid relay opens, removing power from the pump motor and solenoids.
DTC C1204 is stored.
ABS disabled, ABS warning lamp turns ON.

Conditions for Clearing the DTC

If the conditions that set the DTC C1204 are no longer present, the DTC may be cleared by using the proper scan tool.
The DTC that has not occurred in 100 drive cycles will be cleared from history data.

Diagnostic Aids

Thoroughly inspect the wiring and connectors when diagnosing intermittent DTCs. This will include the following:

Removal of the protective conduit and inspection of wiring for damage, shorts, and contamination
Inspection for improperly formed and/or damaged terminals
Checking terminal contact retention force by using a spare male/female terminal
Removal of the terminals from the connectors to check for proper terminal to wire crimp

If the driver comments reflect that the ABS warning lamp is ON only during moist environmental changes, such as, rain, snow, vehicle wash, the all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. If the DTC is not current, simulate the effects of water intrusion. Use the following procedure. Spray the suspected area with a 5 percent salt-water solution. Then test drive the vehicle over various road surfaces such as bumps, turns, etc., above 24 km/h (15 mph). If the DTC sets then replace the suspected harness and/or sensor.

A careful visual inspection of the wheel speed sensor for damage such as cracks and damage should be performed. If the DTC sets at the same speed every drive cycle, the wheel speed sensor is most likely damaged.

Failure to perform the previous steps carefully and fully can result in misdiagnosis, unnecessary component replacement, and recurrence of DTC C1204.

Step 1 - Step 5

Step 6 - Step 10

Step 11 - Step 16

Step 17 - Step 19

© 2012 ALLDATA LLC. All rights reserved.
Terms of Use

Answered by Dr. Hagerty (expert)
9,669 answers provided

DTC C1205

Circuit Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a DTC to set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1205 Right Front Wheel Speed Sensor Input Signal Equals Zero

Conditions for Running the DTC

Ignition is in the ON position.

Conditions for Setting the DTC

All of the following must be true for DTC C1205 to set:

DTC C1200, C1203, C1206, or C1209 not current
ABS not active
Brake switch OFF
The right front wheel speed equals 0, and all of the remaining wheel speed sensors are greater than 8 km/h (5 mph) for at least 2.5 seconds.

Action Taken When the DTC Sets

The solenoid relay opens, removing power from the pump motor and solenoids.
DTC C1205 is stored.
ABS disabled, ABS warning lamp turns ON.

Conditions for Clearing the DTC

If the conditions that set the DTC C1205 are no longer present, the DTC may be cleared by using the proper scan tool.
The DTC that has not occurred in 100 drive cycles will be cleared from history data.

Diagnostic Aids

Thoroughly inspect the wiring and connectors when diagnosing intermittent DTCs. This will include the following:

Removal of the protective conduit and inspection of wiring for damage, shorts, and contamination
Inspection for improperly formed and/or damaged terminals
Checking terminal contact retention force by using a spare male/female terminal
Removal of the terminals from the connectors to check for proper terminal to wire crimp

If the driver comments reflect that the ABS warning lamp is ON only during moist environmental changes, such as rain, snow, vehicle wash, the all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. If the DTC is not current, simulate the effects of water intrusion. Use the following procedure. Spray the suspected area with a 5 percent salt-water solution. Then test drive the vehicle over various road surfaces such as, bumps, turns, etc., above 24 km/h (15 mph). If the DTC sets then replace the suspected harness and/or sensor.

When measuring wheel speed sensor resistance, ensure the vehicle is at room temperature, since resistance will increase with temperature.

Failure to perform the previous steps carefully and fully can result in misdiagnosis, unnecessary component replacement, and reoccurrence of DTC C1205.

Step 1 - Step 5

Step 6 - Step 10

Step 11 - Step 16

Step 17 - Step 18

© 2012 ALLDATA LLC. All rights reserved.
Terms of Use

Answered by Dr. Hagerty (expert)
9,669 answers provided

DTC C1208

Circuit Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a DTC to set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1208 Left Rear Wheel Speed Sensor Input Signal Equals Zero

Conditions for Running the DTC

Ignition is in the ON position.

Conditions for Setting the DTC

All of the following must be true for DTC C1208 to set:

DTC C1200, C1203, C1206, or C1209 not current
ABS not active
Brake switch OFF
The left rear wheel speed equals 0, and all of the remaining wheel speed sensors are greater than 8 km/h (5 mph) for at least 2.5 seconds.

Action Taken When the DTC Sets

The solenoid relay opens, removing power from the pump motor and solenoids.
DTC C1208 is stored.
ABS disabled, ABS warning lamp turns ON.

Conditions for Clearing the DTC

If the conditions that set the DTC C1208 are no longer present, the DTC may be cleared by using the proper scan tool.
The DTC that has not occurred in 100 drive cycles will be cleared from history data.

Diagnostic Aids

Thoroughly inspect the wiring and connectors when diagnosing intermittent DTCs. This will include the following:

Removal of the protective conduit and inspection of wiring for damage, shorts, and contamination
Inspection for improperly formed and/or damaged terminals
Checking terminal contact retention force by using a spare male/female terminal
Removal of the terminals from the connectors to check for proper terminal to wire crimp

If the driver comments reflect that the ABS warning lamp is ON only during moist environmental changes, such as rain, snow, vehicle wash, the all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. If the DTC is not current, simulate the effects of water intrusion. Use the following procedure. Spray the suspected area with a 5 percent salt-water solution. Then test drive the vehicle over various road surfaces, bumps, turns, etc., above 24 km/h (15 mph). If the DTC sets then replace the suspected harness and/or sensor.

When measuring wheel speed sensor resistance, ensure that the vehicle is room temperature, since resistance will increase with temperature.

Failure to perform the previous steps carefully and fully can result in misdiagnosis, unnecessary component replacement and reoccurrence of DTC C1208.

Step 1 - Step 7

Step 8 - Step 12

Step 13 - Step 18

© 2012 ALLDATA LLC. All rights reserved.
Terms of Use

Answered by Dr. Hagerty (expert)
9,669 answers provided

DTC C1211

Circuit Description

As the wheel is rotated, the speed sensor produces an AC voltage that increases with wheel speed. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed. The speed sensor is connected to the EBCM by a twisted pair of wires. Twisting reduces noise susceptibility that may cause a DTC to set.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC C1211 Right Rear Wheel Speed Sensor Input Signal Equals Zero

Conditions for Running the DTC

Ignition is in the ON position.

Conditions for Setting the DTC

All of the following must be true for DTC C1211 to set.

DTC 1200, C1203, C1206, or C1209 not current
ABS not active
Brake switch OFF
The right rear wheel speed equals 0, and all of the remaining wheel speed sensors are greater than 8 km/h (5 mph) for at least 2.5 seconds.

Action Taken When the DTC Sets

The solenoid relay opens, removing power from the pump motor and solenoids.
DTC C1211 is stored.
ABS disabled, ABS warning lamp turns ON.

Conditions for Clearing the DTC

If the conditions that set the DTC C1211 are no longer present, the DTC may be cleared by using the proper scan tool.
The DTC that has not occurred in 100 drive cycles will be cleared from history data.

Diagnostic Aids

Thoroughly inspect the wiring and connectors when diagnosing intermittent DTCs. This will include the following:

Removal of the protective conduit and inspection of wiring for damage, shorts, and contamination
Inspection for improperly formed and/or damaged terminals
Checking terminal contact retention force by using a spare male/female terminal
Removal of the terminals from the connectors to check for proper terminal to wire crimp

If the driver comments reflect that the ABS warning lamp is ON only during moist environmental changes, such as rain, snow, vehicle wash, the all wheel speed sensor circuitry should be thoroughly inspected for signs of water intrusion. If the DTC is not current, simulate the effects of water intrusion. Use the following procedure. Spray the suspected area with a 5 percent salt-water solution. Then test drive the vehicle over various road surfaces such as bumps, turns, etc., above 24 km/h (15 mph). If the DTC sets then replace the suspected harness and/or sensor.

When measuring wheel speed sensor resistance, ensure the vehicle is at room temperature, since resistance will increase with temperature.

Failure to perform the previous steps carefully and fully can result in misdiagnosis, unnecessary component replacement, and reoccurrence of DTC C1211.

Step 1 - Step 7

Step 8 - Step 12

Step 13 - Step 18

© 2012 ALLDATA LLC. All rights reserved.
Terms of Use

Answered by Dr. Hagerty (expert)
9,669 answers provided