Code C0045 and C0561, ABS, track lights, all wheel drive off lights are on

Good morning,

Yes, the rear ABS sensor may be the issue. It has nothing to do with your repair.

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

https://www.2carpros.com/articles/how-to-replace-an-abs-wheel-speed-sensor

A word of advice. Removing the battery cable does nothing. when a code is set, erasing the code does nothing. You need diagnostics and repairs done before the system will reset. The ABS system does not need to be reset. If your repair is correct, the light will go out by itself when you get to 8 MPH after the repair. If the light does not go out, then the repair was not correct.

The 561 is a result of the 45 code. Once the sensor is replaced, then both will go inactive.

Roy

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle (See: Vehicle Lifting > Procedures > Lifting and Jacking the Vehicle).
2. Remove the tire and wheel assembly. Refer to Tire and Wheel Removal and Installation (See: Wheels and Tires > Removal and Replacement > Tire and Wheel Removal and Installation).
3. Disconnect the wheel speed sensor electrical connector (1).
4. Release the wheel speed sensor wire harness grommet (2) from the lower control arm bracket.
5. Release the wheel speed sensor wire harness routing clips (3) from the upper suspension link.

561
DTC C0561

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle (See: Vehicle > Initial Inspection and Diagnostic Overview > Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
Review Strategy Based Diagnosis (See: Vehicle > Initial Inspection and Diagnostic Overview > Strategy Based Diagnosis) for an overview of the diagnostic approach.
Diagnostic Procedure Instructions (See: Vehicle > Initial Inspection and Diagnostic Overview > Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

DTC Descriptors
DTC C0561 71
System Disabled Information Stored Invalid Serial Data Received

DTC C0561 72
System Disabled Information Stored Alive Counter Incorrect

DTC C0561 74
System Disabled Information Value of Signal Protection Calculation Incorrect

Circuit/System Description

The electronic brake control module (EBCM) receives serial data messages from the body control module (BCM), engine control module (ECM), instrument panel cluster (IPC), and the transmission control module (TCM) which are needed to perform antilock brake system (ABS), vehicle stability enhancement system (VSES), or traction control system (TCS) functions.

Conditions for Running the DTC

Ignition voltage is greater than 10 volts.

Conditions for Setting the DTC

The EBCM receives an invalid serial data message from another module.

Action Taken When the DTC Sets

The EBCM disables the traction control system (TCS)/ vehicle stability enhancement system (VSES).
A DIC message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

The condition for the DTC is no longer present.
The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

This DTC indicates that there are no problems in the EBCM. The BCM, ECM, IPC and the TCM should be checked for a possible fault.

Reference Information
Schematic Reference

Antilock Brake System Schematics (See: Antilock Brakes / Traction Control Systems > Electrical)
Connector End View Reference

Component Connector End Views (See: Vehicle > Connector Views)
Description and Operation

ABS Description and Operation (See: Antilock Brakes / Traction Control Systems > Components > ABS Description and Operation)
Electrical Information Reference

Circuit Testing (See: Vehicle > Component Tests and General Diagnostics > Circuit Testing)
Connector Repairs (See: Vehicle > Component Tests and General Diagnostics > Connector Repairs)
Testing for Intermittent Conditions and Poor Connections (See: Vehicle > Component Tests and General Diagnostics > Testing for Intermittent Conditions and Poor Connections)
Wiring Repairs (See: Vehicle > Component Tests and General Diagnostics > Wiring Repairs)

Scan Tool Reference

Programming and Relearning (See: Vehicle > Programming and Relearning) for scan tool information

Circuit/System Verification

1. With a scan tool, view the Invalid Signal Data Display.
2. If no invalid signal are present, view Signal Fault Data in the Enhanced DTC Data.
3. Refer to appropriate module for diagnosing the invalid message data.
4. Do not replace the EBCM due to this DTC fault.

The C0045 is a circuit code for a left rear speed sensor, it can mean the sensor is bad but more times it is that the wiring to it is faulty.
The C0561 is a code that says the traction control is off because of a fault it has from the electronic brake control module (aka the ABS and traction control module) The C0561 should have a descriptor with it, either a 71, 72, 74 or 75. Some scan tools cannot read the descriptor information.
Checking the wiring harness isn't hard but because of the way the system works you need a VOM that can capture the initial 12 volt pulse that the EBCM sends out, it is a very short pulse that the module uses to test the wiring integrity and if you have the sensor disconnected or it is faulty the system sends the pulse, then shuts off the voltage because of the fault. If you have access to such a meter or a scope then follow this process -

Key Off, Remove Key, Open and Close the drivers door to turn off Retained Accessory Power and wait at least 60 seconds.
B. Disconnect the left rear speed sensor connector.
C. Connect a DVOM across the wheel speed sensor "Supply Voltage" and "Signal" circuits from the EBCM.
D. Set the DVOM on DC volts 12-50 volts and press the data capture, min/max button or whatever the meter uses to capture a voltage peak.
E. Turn the ignition key on. There will be a quick momentary 12 volt pulse from the EBCM at key up. This 12 volt pulse is sent each time the EBCM is powered up after being asleep to check the WSS circuit integrity. If you see the pulse then the wiring to the connector is okay. If the test shows the wiring is okay then the fault is likely sensor related. The sensor itself reads a thin magnetic ring on the back of the wheel bearing, if that ring is dirty or damaged it can set this code as well. Testing that requires a scope that will let you read the pulses the sensor generates and see if they are properly spaced or not. The picture is the bearing unit, the red lines are the magnetic ring and the direction of the individual magnetic lines, there are far more than I drew. Normally damage there will set a different code first but if you test the sensor wires and replace the sensor as a test item (they are under $50.00 which is probably cheaper than the testing if you take it to a shop) and it still sets the same code after testing for the pulse and replacing the sensor.
As for the replacement, normally you just unclip the wiring harness clips and brackets and remove the bolt that retains the sensor, then remove the sensor, however if you live in the rust belt the sensor will likely require more work to remove it, they have a bad habit of rusting into the mount and breaking off.

Everytime you turn off the car, the ABS system forgets the codes on the last drive cycle. When you start the car the ABS does its self test. If it passes, the light will go out until the fault returns.

It has nothing to do with the misfire codes at all.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Can you verify the 2 codes? The 989 and 561 are not coming up.

Roy

Keep me updated.

Roy

With ABS codes this is sort of common for wiring issues. The wires move around a bit and suddenly connect and the system thinks it's good so you get no codes. Then a day later the wire moves differently and now is seen as disconnected and the code returns. It's one of the reasons why I normally test as much as possible before actually touching anything. Not a good thing to "fix" the problem without knowing what actually was wrong. In this case what you could do is a wiggle test, Start at the sensor and wiggle the wires and see if the code comes back. Continue up the wiring until you find the bad connection or bad wire that triggers the code.

I attached the wiring diagram of the system for you to view.

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

Do you or can you get a scan tool that reads ABS live data?

https://www.2carpros.com/articles/abs-warning-light-on-easy-repair-guide

Roy

As Roy said, time to look close at the wiring to the sensor. The misfire codes shouldn't be related but you may also want to check the grounds for the coils and the ABS module. It's not real likely but a bad ground on the coils could cause some strange things if the voltages were looking for a path to ground. The coils ground at the back of the engine on the manifold and from the engine to a ground on the left fender, the ABS is grounded to a point on the same fender.

No, it is not.

The test light check you did verifies that the wire you tested is a ground.

If you disconnect the negative, not positive, and insert an amp meter, it will tell you the total system draw while the engine is off. It will not tell you if you have a short circuit at all.

Roy

You are welcome.

Always glad to help.

Roy

I use test leads for my voltage meter called load pro.

You can use it to test for open circuits, short circuits, and corrosion in a circuit by the testing voltage drop across the connectors.

You can go to YouTube and search for load pro by Dan Sullivan. Watch the video as he gives good information.

https://www.youtube.com/watch?v=I8kbEsXCRfc&t=632s

Roy

Yes, you can. You measure the resistance of the sensor. It should be 800-2600 ohms.

You also can check for AC voltage while rotating the wheel. That way it checks not only the sensor but the tone ring as well.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

This testing will work on most vehicles.

Roy