My abs and anti skid lights were on. 09 avalanche lt, 135,000 miles. So I bought a scanner and it told me it was RR wheel speed sensor. So I replaced it. Now there is no light until I hit the brakes, then the brake pedal pulses and the lights come back on. Same thing every time I start it.
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Abs and anti skid lights are on
- Thread starter Rdry1952
- Start date
MS03 2500
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What was the actual code. 
MS03 2500
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Check the plug for a loose wire or corrosion
MS03 2500
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Yes ,
Also clear the code to see if it comes back
Also clear the code to see if it comes back
BainMan
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Similar to what MS03 said, It may be the wiring somewhere from the speed sensor plug up to the ABS module, see if you can test the wire from end to end for continuity.
You can also test the speed sensor itself with a multi meter, but since the ABS light pops on before your wheel starts turning suspect wiring/connection first instead of this. Regardless, this is a simple test to rule out the new speed sensor as an issue. https://www.youtube.com/watch?v=jG18XmUJoNU
You can also test the speed sensor itself with a multi meter, but since the ABS light pops on before your wheel starts turning suspect wiring/connection first instead of this. Regardless, this is a simple test to rule out the new speed sensor as an issue. https://www.youtube.com/watch?v=jG18XmUJoNU
Could also be rust sticking around the sensor as well.
Need to check out the sensor and see what is around it. There should be a ring too. If there is rust it can throw the sensor off but strange that it only happens when you brake.
Need to check out the sensor and see what is around it. There should be a ring too. If there is rust it can throw the sensor off but strange that it only happens when you brake.
I tried to test like the video showed and didn't get a reading so I hooked up my scanner and took it for a drive. The live data reading was very erratic on that sensor. The rest were smooth. I think I'll swap the two rear sensors and see what happens. Thanks for the help.
I swapped the rear wheel speed sensors and the code went to the other side where the new sensor was. I think I got a bad sensor, but something strange, when I took it for a short drive neither rear sensor showed any speed in the live data. Both front ones were smooth. Anyway I ordered a replacement ,put the left one back where it was working and I'll install the new one when I get it.
MS03 2500
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What scanner are you using.
BainMan
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Are tire pressures correct? Have you changed tire size from factory?
ABS Diagnostics for C0245: The copy/paste is a little messy...
DTC C0245 00
Wheel Speed Sensor Frequency Error
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
DTC C0245 (Equal to or Under 8600 GVW)
Circuit/System Description
The wheel speed sensor receives a 12-volt power supply voltage from the electronic brake control module
(EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends the
EBCM a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the
wheel speed.
Conditions for Running the DTC
The ignition is ON.
Ignition voltage is greater than 9.5 volts.
No wheel speed sensor faults exist.
Brake is not applied.
Vehicle is not cornering.
No wheel spinning is detected.
Conditions for Setting the DTC
Wheel speed differences between one wheel and the others is greater than 25 percent.
Action Taken When the DTC Sets
Antilock Brake System (ABS), Traction Control System (TCS) and Vehicle Stability Enhancement
Circuit Short to Ground
Open/High Resistance
Short to Voltage Signal
Performance
Wheel Speed Sensor Frequency Error - - - C0245 00
2007 BRAKES Antilock Brake System - Avalanche, Escalade, Suburban, Tahoe & Yukon
System (VSES) are disabled for the remainder of the ignition cycle.
The ABS and Stabilitrak indicator turns ON.
The service Traction Control and Stabilitrak displays on the DIC.
Conditions for Clearing the DTC
The DTC becomes history when the conditions for setting the DTC are no longer present.
The history DTC clears after 100 malfunction-free ignition cycles.
The EBCM receives a clear code command from the scan tool.
Diagnostic Aids
Faulty wheel speed sensor will not set this DTC.
A vehicle using a space saver spare will not set this code.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation
ABS Description and Operation (8600 GVW or Less) or ABS Description and Operation (Over 8600
GVW)
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Scan Tool Data List for EBCM
Circuit/System Verification
Inspect for one tire that has improper air pressure or improper size.
Repair Procedures
2007 Cadillac Escalade
2007 BRAKES Antilock Brake System - Avalanche, Escalade, Suburban, Tahoe & Yukon
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
ABS Diagnostics for C0245: The copy/paste is a little messy...
DTC C0245 00
Wheel Speed Sensor Frequency Error
Diagnostic Fault Information
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
DTC C0245 (Equal to or Under 8600 GVW)
Circuit/System Description
The wheel speed sensor receives a 12-volt power supply voltage from the electronic brake control module
(EBCM) and provides an output signal to the EBCM. As the wheel spins, the wheel speed sensor sends the
EBCM a DC square wave signal. The EBCM uses the frequency of the square wave signal to calculate the
wheel speed.
Conditions for Running the DTC
The ignition is ON.
Ignition voltage is greater than 9.5 volts.
No wheel speed sensor faults exist.
Brake is not applied.
Vehicle is not cornering.
No wheel spinning is detected.
Conditions for Setting the DTC
Wheel speed differences between one wheel and the others is greater than 25 percent.
Action Taken When the DTC Sets
Antilock Brake System (ABS), Traction Control System (TCS) and Vehicle Stability Enhancement
Circuit Short to Ground
Open/High Resistance
Short to Voltage Signal
Performance
Wheel Speed Sensor Frequency Error - - - C0245 00
2007 BRAKES Antilock Brake System - Avalanche, Escalade, Suburban, Tahoe & Yukon
System (VSES) are disabled for the remainder of the ignition cycle.
The ABS and Stabilitrak indicator turns ON.
The service Traction Control and Stabilitrak displays on the DIC.
Conditions for Clearing the DTC
The DTC becomes history when the conditions for setting the DTC are no longer present.
The history DTC clears after 100 malfunction-free ignition cycles.
The EBCM receives a clear code command from the scan tool.
Diagnostic Aids
Faulty wheel speed sensor will not set this DTC.
A vehicle using a space saver spare will not set this code.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Antilock Brake System Connector End Views
Description and Operation
ABS Description and Operation (8600 GVW or Less) or ABS Description and Operation (Over 8600
GVW)
Electrical Information Reference
Circuit Testing
Connector Repairs
Testing for Intermittent Conditions and Poor Connections
Wiring Repairs
Scan Tool Reference
Scan Tool Data List for EBCM
Circuit/System Verification
Inspect for one tire that has improper air pressure or improper size.
Repair Procedures
2007 Cadillac Escalade
2007 BRAKES Antilock Brake System - Avalanche, Escalade, Suburban, Tahoe & Yukon
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
BainMan
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c0245 diagnositc attached. Do you have any other codes also?
In summary:
1. Inspect all of the tires on the vehicle to ensure that all of the tires are of equal size.
2. All tires inflated?
3. Inspect the wheel speed sensors and tone rings for damage, incorrect application, or incorrect installation.
4. Clear code and see if it returns.
In summary:
1. Inspect all of the tires on the vehicle to ensure that all of the tires are of equal size.
2. All tires inflated?
3. Inspect the wheel speed sensors and tone rings for damage, incorrect application, or incorrect installation.
4. Clear code and see if it returns.
Yes I do have more codes. I didn't know I had to turn the page. Lol. C0899 & C0900. The tires are all the same and air pressure is good. I think my battery might be bad. I had the key on for a few minutes checking codes and then it wouldn't turn over. I'll check that out tomorrow. Thanks
BainMan
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Additionally, if for some reason you still get these errors after getting a good battery in place:
C0899:
Circuit/System Testing
1. Measure and record the voltage at the battery terminals. With scan tool, observe the battery voltage signal
parameter. Verify that battery terminal voltage and battery voltage signal readings do not differ more than
1 volt.
If more than 1 volt, test the battery positive voltage and ground circuits of the EBCM for an
open/high resistance or replace the EBCM.
2. Refer to Charging System Test.
c0900:
Circuit/System Testing
1.If the DTC is history, refer to Charging System Test.
2. Start the engine, record the voltage at the battery terminals. Observe the battery voltage signal parameter
in the EBCM data list. Voltages should not differ by more than 1 volt.
If more than 1 volt, replace the EBCM.
C0899:
Circuit/System Testing
1. Measure and record the voltage at the battery terminals. With scan tool, observe the battery voltage signal
parameter. Verify that battery terminal voltage and battery voltage signal readings do not differ more than
1 volt.
If more than 1 volt, test the battery positive voltage and ground circuits of the EBCM for an
open/high resistance or replace the EBCM.
2. Refer to Charging System Test.
c0900:
Circuit/System Testing
1.If the DTC is history, refer to Charging System Test.
2. Start the engine, record the voltage at the battery terminals. Observe the battery voltage signal parameter
in the EBCM data list. Voltages should not differ by more than 1 volt.
If more than 1 volt, replace the EBCM.