C1210
DTC C0035-C0050, C1207-C1210, C1221-C1228, or C1232-C1235
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.
DTC Descriptors
DTC C0035 04
- Left Front Wheel Speed Sensor Circuit Open Circuit
DTC C1232 00
- Left Front Wheel Speed Sensor Circuit Low Input
DTC C0035 26
- Left Front Wheel Speed Sensor Circuit Frequency too Low
DTC C1221 00
- Left Front Wheel Speed Sensor Circuit Malfunction
DTC C0035 27
- Left Front Wheel Speed Sensor Circuit Frequency too High
DTC C1225 00
- Left Front Wheel Speed Sensor Circuit Performance
DTC C0035 0E
- Left Front Wheel Speed Sensor Circuit Resistance Below Threshold
DTC C1207 00
- Left Front Wheel Speed Sensor Circuit High Input
DTC C0035 1F
- Left Front Wheel Speed Sensor Circuit Intermittent
DTC C1221 00
- Left Front Wheel Speed Sensor Circuit Malfunction
DTC C0040 04
- Right Front Wheel Speed Sensor Circuit Open Circuit
DTC C1233 00
- Right Front Wheel Speed Sensor Circuit Low Input
DTC C0040 0E
- Right Front Wheel Speed Sensor Circuit Resistance Below Threshold
DTC C1208 00
- Right Front Wheel Speed Sensor Circuit High Input
DTC C0040 1F
- Right Front Wheel Speed Sensor Circuit Intermittent
DTC C1222 00
- Right Front Wheel Speed Sensor Circuit Malfunction
DTC C0040 26
- Right Front Wheel Speed Sensor Circuit Frequency too Low
DTC C1222 00
- Right Front Wheel Speed Sensor Circuit Malfunction
DTC C0040 27
- Right Front Wheel Speed Sensor Circuit Frequency too High
DTC C1226 00
- Right Front Wheel Speed Sensor Circuit Performance
DTC C0045 04
- Left Rear Wheel Speed Sensor Circuit Open Circuit
DTC C1234 00
- Left Rear Wheel Speed Sensor Circuit Low Input
DTC C0045 0E
- Left Rear Wheel Speed Sensor Circuit Resistance Below Threshold
DTC C1209 00
- Left Rear Wheel Speed Sensor Circuit High Input
DTC C0045 1F
- Left Rear Wheel Speed Sensor Circuit Intermittent
DTC C1223 00
- Left Rear Wheel Speed Sensor Circuit Malfunction
DTC C0045 26
- Left Rear Wheel Speed Sensor Circuit Frequency too Low
DTC C1223 00
- Left Rear Wheel Speed Sensor Circuit Malfunction
DTC C0045 27
- Left Rear Wheel Speed Sensor Circuit Frequency too High
DTC C1227 00
- Left Rear Wheel Speed Sensor Circuit Performance
DTC C0050 04
- Right Rear Wheel Speed Sensor Circuit Open Circuit
DTC C1235 00
- Right Rear Wheel Speed Sensor Circuit Low Input
DTC C0050 0E
- Right Rear Wheel Speed Sensor Circuit Resistance Below Threshold
DTC C1210 00
- Right Rear Wheel Speed Sensor Circuit High Input
DTC C0050 1F
- Right Rear Wheel Speed Sensor Circuit Intermittent
DTC C1224 00
- Right Rear Wheel Speed Sensor Circuit Malfunction
DTC C0050 26
- Right Rear Wheel Speed Sensor Circuit Frequency too Low
DTC C1224 00
- Right Rear Wheel Speed Sensor Circuit Malfunction
DTC C0050 27
- Right Rear Wheel Speed Sensor Circuit Frequency too High
DTC C1228 00
- Right Rear Wheel Speed Sensor Circuit Performance
Diagnostic Fault Information
Circuit/System Description
The wheel speed sensor receives12-volt reference voltage from the electronic brake control module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.
Conditions for Running the DTC
* Ignition ON.
* Ignition voltage is greater than 10 volts.
* The brake pedal is not pressed.
* Two or three other wheel speeds are greater than 0 km/h.
Conditions for Setting the DTC
C0035 04 - C0050 04, C0035 0E - C0050 0E, C1207 - C1210, or C1232 - C1235
A short to voltage, short to ground or an open/high resistance is detected on a wheel speed sensor circuit.
C0035 26 - C0050 26, C0035 27 - C0050 27, C0035 1F - C0050 1F, C1221 - C1224, or C1225 - C1228
* A missing wheel speed sensor signal.
* An erratic signal output of the wheel speed sensor is detected.
* The EBCM detects a change in wheel speed that exceeds 20 km/h (12 mph) between two 10 millisecond wheel speed samples.
Actions Taken when the DTC Sets
* The EBCM disables the antilock brake system (ABS), traction control and StabiliTrak for the duration of the ignition cycle.
* A driver information center message and/or a warning indicator may be displayed.
Conditions for Clearing the DTC
* The condition for the DTC is no longer present.
* Operate the vehicle at speeds greater than 15 km/h (10 mph) to complete the self test, and the EBCM will turn off the ABS indicator.
* The EBCM clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.
Diagnostic Aids
* Inspect the back of the wheel bearing on the encoder surface for metal debris that could cause an erratic reading with the sensor. Do not use a magnet to clean the debris, or damage to the encoder ring may occur.
* If 2 or more wheel speed sensors are inoperative diagnose each wheel speed sensor individually.
If the customer comments that the ABS indicator is ON only during moist environmental conditions: rain, snow, vehicle wash, etc., inspect the wheel speed sensor wiring for signs of water intrusion. If the DTC is not current, clear all DTCs and simulate the effects of water intrusion by using the following procedure:
1. Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 8 fl oz of water (10 g of salt to 200 ml of water).
2. Test drive the vehicle over various road surfaces: bumps, turns, etc., above 40 km/h (25 mph) for at least 30 seconds.
3. Rinse the area thoroughly when completed.
Reference Information
Schematic Reference
Antilock Brake System Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
ABS Description and Operation (ABS Hybrid (HP2))
Electrical Information Reference
* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
Observe the scan tool Wheel Speed Sensor parameter. The reading should be the same speed on all sensors when driving in a straight line at a speed greater than 20 km/h (13 mph).
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the EBCM.
2. Ignition ON, test for less than 1 V between the 12 V reference circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 28
* Right front sensor circuit terminal 17
* Left rear sensor circuit terminal 4
* Right rear sensor circuit terminal 3
• If greater than the specified range, test the 12 V reference circuit for a short to voltage.
3. Test for less than 1 V between the signal circuit terminal of the appropriate sensor listed below and ground.
* Left front sensor circuit terminal 29
* Right front sensor circuit terminal 6
* Left rear sensor circuit terminal 5
* Right rear sensor circuit terminal 2
• If greater than the specified range, test the signal circuit for a short to voltage.
4. Ignition OFF, test for infinite resistance between the 12 V reference terminal of the appropriate sensor circuit listed below and ground.
* Left front sensor circuit terminal 28
* Right front sensor circuit terminal 17
* Left rear sensor circuit terminal 4
* Right rear sensor circuit terminal 3
• If less than the specified value, test the 12 V reference circuit for a short to ground.
5. Test for infinite resistance between the following signal circuit terminal of the appropriate sensor circuit listed below and ground.
* Left front sensor circuit terminal 29
* Right front sensor circuit terminal 6
* Left rear sensor circuit terminal 5
* Right rear sensor circuit terminal 2
• If less than the specified value, test the signal circuit for a short to ground.
6. Ignition OFF, disconnect the harness connector at the appropriate wheel speed sensor.
7. Test for less than 2 ohm between the appropriate 12 V reference circuit terminals listed below.
* Left front sensor circuit terminal 28 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Right front sensor circuit terminal 17 at the EBCM harness connector, and terminal 2 at the wheel speed sensor harness connector
* Left rear sensor circuit terminal 4 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
* Right rear sensor circuit terminal 3 at the EBCM harness connector, and terminal B at the wheel speed sensor harness connector
• If greater than the specified range, test the 12 V reference circuit for an open or high resistance.
8. Test for less than 2 ohm between the appropriate signal circuit terminals listed below.
* Left front sensor circuit terminal 29 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Right front sensor circuit terminal 6 at the EBCM harness connector, and terminal 1 at the wheel speed sensor harness connector
* Left rear sensor circuit terminal 5 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
* Right rear sensor circuit terminal 2 at the EBCM harness connector, and terminal A at the wheel speed sensor harness connector
• If greater than the specified range, test the signal circuit for an open or high resistance.
9. If all circuits test normal, replace the appropriate wheel speed sensor and verify the DTC does not reset. If the DTC resets replace the EBCM.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Front Wheel Speed Sensor Replacement (Front Wheel Speed Sensor Replacement)
* Rear Wheel Speed Sensor Replacement (Rear Wheel Speed Sensor Replacement Hybrid (HP2))
* Control Module References (Programming and Relearning) for EBCM replacement, setup, and programming