C0245
DTC C0245
Circuit Description
As the wheel spins, the wheel speed sensor produces an alternating current signal. The electronic brake control module (EBCM) uses the frequency of the AC signal to calculate the wheel speed.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0245 Wheel Speed Sensor Frequency Error
Conditions for Running the DTC
* The ignition switch is ON.
* The DTC can be set after system initialization.
Conditions for Setting the DTC
* The EBCM detects a deviation between two wheel speeds at either side of the vehicle, or at the front or rear axle of greater than 6 km/h (3.75 mph) at a vehicle speed of less than 100 km/h (62 mph).
* The EBCM detects a deviation between two wheel speeds at either side of the vehicle, or at the front or rear axle of greater than 6 percent of the vehicle speed at greater than 100 km/h (62 mph).
This DTC will set when the EBCM cannot specifically identify which wheel speed sensor is causing the malfunction. If the EBCM can identify the specific wheel speed sensor causing the malfunction, DTC C0245 will become a history DTC, and the DTC associated with the sensor (DTC C0036, DTC C0041, DTC C0046, DTC C0051) will be set concurrent with DTC C0245.
Diagnose each wheel speed sensor individually.
Action Taken When the DTC Sets
If equipped, the following actions occur:
* A malfunction DTC stores
* The ABS/TCS disables
* The amber ABS indicator turn on
* The traction control switch LED will turn off
Conditions for Clearing the DTC
* The condition for the DTC is no longer present and you used the scan tool Clear DTC function.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.
Diagnostic Aids
* It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
* Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:
^ Backed out terminals
^ Improper mating
^ Broken locks
^ Improperly formed or damaged terminals
^ Poor terminal-to-wiring connections
^ Physical damage to the wiring harness
* The following conditions may cause an intermittent malfunction:
^ A poor connection
^ Rubbed-through wire insulation
^ A broken wire inside the insulation
* If the customer's comments reflect that the amber ABS/TCS indicator is on only during moist environmental conditions (rain, snow, vehicle wash), inspect all the wheel speed sensor circuitry 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 five percent saltwater solution.
Add two teaspoons of salt to twelve ounces of water to make a five percent saltwater solution.
2. Test drive the vehicle over various road surfaces (bumps, turns, etc.) above 43 km/h (27 mph) for at least 30 seconds.
3. If the DTC returns, replace the suspected harness.
* If an intermittent malfunction exists Refer to Testing for Intermittent Conditions and Poor Connections. Component Tests and General Diagnostics
Test Description
The numbers below refer to step numbers on the diagnostic table.
2. If DTC C0245 is a history code, this step checks if a specific Wheel Speed Circuit Malfunction DTC is set concurrently with DTC C0245.
7. This step checks if the wheel speed sensor harness is routed in close proximity to the spark plug wires.
9. In this step, if the scan tool can record any erroneous wheel speed sensor signals, diagnose that sensor(s) first.
