C0035 Fix?

tyhuck · February 23, 2013

Ok, i cleaned the sensor and reinstalled everyrhing. Cleared out the code and drove 10 miles home. Scanned it again but still pulled the same code. Now what?

gmtech4 · February 23, 2013

have it diagnosed thats what ,,,heres the code service info for you ,,good luck

it didnt come out that well for some reason ,hope it makes sense

DTC C0035 or C0040

Circuit Description

As the wheels spin, each wheel speed sensor produces an AC signal. The
electronic brake control module (EBCM) uses the frequency of the AC signals to
calculate each wheel speed.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

•
DTC C0035 Left Front Wheel Speed Sensor
Circuit

•
DTC C0040 Right Front Wheel Speed Sensor
Circuit

Conditions for Running the DTC

•
The ignition is
ON.

•
The vehicle speed is greater than 13 km/h
(8 mph).

Conditions for Setting the DTC

Any of the following occurrences may cause the DTC to set.

•
The EBCM detects an open or shorted wheel speed
sensor circuit for 500 milliseconds.

•
The EBCM detects the absence of a wheel speed
sensor signal for 5 seconds. If more than one absent wheel speed sensor signal
is detected, the condition must be present for 120 seconds to set
DTCs.

•
The EBCM detects an erratic wheel speed sensor
signal for 200 milliseconds.

Action Taken When the DTC Sets

•
The EBCM disables the ABS and may disable the
dynamic rear proportion (DRP) if more than one wheel speed sensor DTC is
set.

•
The ABS indicator turns
ON.

•
The brake warning indicator may turn
ON.

The actions above are maintained during subsequent ignition cycles until the
EBCM completes a power up self-test. This test concludes when the vehicle
achieves a speed greater than 13 km/h (8 mph) and the wheel speeds are verified
by the EBCM.

Conditions for Clearing the DTC

The Conditions for Setting the DTC are no longer present and you use the scan
tool Clear DTCs function.

Diagnostic Aids

•
Thoroughly inspect the EBCM ground, connections
or circuitry that may cause an intermittent malfunction. Refer to Testing for
Intermittent Conditions and Poor Connections , Connector
Repairs , Testing for
Electrical Intermittents and to Wiring
Repairs in Wiring Systems.

•
Inspect the following components listed below
that may cause the DTC to set:

•
Physical damage to encoder ring
teeth.

•
Debris on the wheel speed sensor or the encoder
ring

•
Inspect wheel speed sensor mounting
surface

•
Loose or improperly mounted
sensor

•
Air gap between the wheel speed sensor and the
encoder ring may be too large

•
Loose or worn wheel
bearing

•
Water intrusion in the wiring harness and/or
connector

If the customer's concern is that the ABS indicator is on only during humid
conditions such as rain, snow or vehicle wash, thoroughly inspect the wheel
speed sensor circuits for signs of water intrusion. Use the following procedure
in order to help isolate the problem area:

1.
Spray the suspected area with a 5 percent salt
water solution.

2.
Operate the vehicle at a speed greater than
13 km/h (8 mph) for at least 30 seconds.

Repair or replace the suspect harness if the DTC sets.

Step

Action

Values

Yes

No

Schematic
Reference: Antilock Brake
System Schematics

1

Did you perform the Diagnostic System Check –
Vehicle?

—

Go to Step 2

Go to Diagnostic
System Check - Vehicle in Vehicle DTC Information

2

1.
Use a scan tool in order to clear the
DTCs.

2.
Operate the vehicle at a speed greater than the specified
value.

Does the DTC set?

13 km/h (8 mph)

Go to Step 3

Go to Diagnostic Aids

3

1.
Turn OFF the ignition.

2.
Raise and support the vehicle. Refer to Lifting and
Jacking the Vehicle in General Information.

3.
Disconnect the wheel speed sensor
connector.

4.
Use a DMM in order to measure the resistance across the wheel
speed sensor.

Does the resistance measure
within the specified range?

700–10,000 Ω

Go to Step 4

Go to Step 8

4

1.
Slowly spin the wheel by hand.

2.
Use a DMM in order to measure the A/C voltage across the wheel
speed sensor as the wheel spins.

Does the A/C
voltage measure greater than the specified value?

100 mV

Go to Step 5

Go to Step 8

5

Inspect for poor connections at the harness
connector of the wheel speed sensor. Refer to Testing for
Intermittent Conditions and Poor Connections and to Connector
Repairs in Wiring Systems.

Did you find and correct the
condition?

—

Go to Step 10

Go to Step 6

6

1.
Disconnect from the electronic brake control module (EBCM), the
harness connector containing the wheel speed sensor
circuits.

2.
Test the wheel speed sensor circuits for the
following:

•
An open

•
A short to ground

•
A short to voltage

•
Shorted together

Refer to Circuit
Testing and to Wiring
Repairs in Wiring Systems.

Did you find and correct the
condition?

—

Go to Step 10

Go to Step 7

7

Important:
Refer to Diagnostic Aids before replacing the EBCM.

Inspect for poor connections at the harness connector for the EBCM. Refer to
Testing for
Intermittent Conditions and Poor Connections and to Connector
Repairs in Wiring Systems.

Did you find and correct the
condition?

—

Go to Step 10

Go to Step 9

8

Replace the wheel speed sensor. Refer to Front Wheel
Speed Sensor Replacement .

Did you complete the
replacement?

—

Go to Step 10

—

9

Replace the EBCM. Refer to Control Module
References in Computer/Integrating Systems for replacement, setup and
programming.

Did you complete the replacement?

—

Go to Step 10

—

10

1.
Use the scan tool in order to clear the
DTCs.

2.
Operate the vehicle within the Conditions for Running the DTC as
specified in the supporting text.

Does the
DTC reset?

—

Go to Step 2

System OK

Edited February 23, 2013 by govtech4

carnau · October 8, 2017

Here is a video that may help you.

Omarrod23 · May 22, 2020

Question I literally just replaced the Left wheel hub less than 100 miles and my service code C0035 "left front Wheel speed sensor popped up shortly after" the reason why I Replaced it was because it was like locking up and making a horrible cracking noise, and once I replaced it, it was good as new/back to normal and now as I pulled into work it happened again. Should I replace the wheel up again since its still under warranty or should I take it in to get it properly diagnosed??? please help and thank you.