ram1500rust
Junior Member
2009 RAM 1500, 5.7
So the rear left wheel speed sensor is not working. ABS module just tells my scan tool that "Rear Left Wheel Sensor Circuit". C1020 is the code.
1. Replaced sensor, nothing
2. Inspected wires, nothing
3. Did a short test, they aren't shorting.
4. Put a large M ohm resistor across in the plug and tested to see if the connector is dirty/oxidized/rusted. Nothing.
5. Inspected ABS module at the front, there was oxidization on the connector but cleaned it and even did a continuity test on both wires all the way to the back.
6. Took apart the ABS module and directly soldered 2 wires coming out and soldered them directly into the harness bypassing the oxidized connector.
7. Did another continuity test directly from the ABS module pins to the rear sensor, seems fine.
8. Swapped rear sensor with the right side, right side still works but left side still doesn't work.
I have no clue what to do anymore I've run out of ideas. I've reset the ABS module like 50 times. Is the module simply toast? It looked pristine inside, not sure where it could be failing.
Is there too much resistance in the wires from some corrosion somewhere?
So the rear left wheel speed sensor is not working. ABS module just tells my scan tool that "Rear Left Wheel Sensor Circuit". C1020 is the code.
1. Replaced sensor, nothing
2. Inspected wires, nothing
3. Did a short test, they aren't shorting.
4. Put a large M ohm resistor across in the plug and tested to see if the connector is dirty/oxidized/rusted. Nothing.
5. Inspected ABS module at the front, there was oxidization on the connector but cleaned it and even did a continuity test on both wires all the way to the back.
6. Took apart the ABS module and directly soldered 2 wires coming out and soldered them directly into the harness bypassing the oxidized connector.
7. Did another continuity test directly from the ABS module pins to the rear sensor, seems fine.
8. Swapped rear sensor with the right side, right side still works but left side still doesn't work.
I have no clue what to do anymore I've run out of ideas. I've reset the ABS module like 50 times. Is the module simply toast? It looked pristine inside, not sure where it could be failing.
Is there too much resistance in the wires from some corrosion somewhere?