On grand prix2006 code C0040 which weel is that my computer tell me rear but no side

The code refers to the right front wheel speed sensor. The fact it is intermittent says that you have a bad connection or a fractured wire or a bad ground. Check out the videos

C0040 - OBD II Trouble Code: Right Front Wheel Speed ...

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C0040 18: Code C0040 18 indicates the ABS module has detected the right front wheel speed sensor signal amplitude is below minimum. More OBD-II Codes. C003E.

Video Help

DTC C0040 Right Front Wheel Speed Sensor Circuit --
Conditions for Setting the DTC
C0035 C0040 C0045 C0050
One of the following conditions exists for 0.02 seconds:
• A short to voltage in the wheel speed sensor signal circuit.
• An open in the wheel speed sensor signal circuit.

Diagnostic Aids
C0035 C0040 C0045 C0050
If the customer comments that the ABS indicator is ON only during moist environmental conditions (rain, snow, vehicle wash, etc.), inspect the wheel speed sensor wiring 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:
Spray the suspected area with a 5 percent saltwater solution. To create a 5 percent saltwater solution, add 2 teaspoons of salt to 354 ml (12 oz) of water.
Test drive the vehicle over various road surfaces (bumps, turns, etc.) above 40 km/h (25 mph) for at least 30 seconds.
If the DTC returns, replace the suspected wheel speed sensor or repair the wheel speed sensor wiring.
Rinse the are thoroughly when completed.


Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the repair?

Do yourself a favor an take it to a qualified repair shop . You need a factory scan tool to see these code's
DTC C0040 00 : Right Front Wheel Speed Sensor Circuit No Additional Information
DTC C0040 0F : Right Front Wheel Speed Sensor Circuit Erratic Signal
DTC C0040 18 : Right Front Wheel Speed Sensor Circuit Signal Amplitude Less Than Minimum

DTC C0899: Device Voltage Low
Circuit/System Description
The electronic brake control module (EBCM) monitors the battery voltage level available for system operation. A low voltage condition prevents the system from operating properly.

Circuit/System Testing
Measure the voltage at the battery terminals.
With scan tool, read the battery voltage in the EBCM data list.
? If less than 10 volts, test the ground circuit of the EBCM for high resistance. If the circuit test normal, test or replace the EBCM.
Go to Battery Inspection/Test and Charging System Test .

Internal memory fault and failure. Every time i have gotten a 606 code, I had to replace the computer. I have replaced about every part in the PCM, except the chips. To many leads coming from a small chip.

C0040 - Right Front Wheel Speed Circuit Malfunction
C0550 - ECU Malfunction - internal write / checksum malfunction
C0455 - Either:

• A bent terminal or poor connection at the SWPS may be one possible cause; or
• The vehicle stability enhancement system (VSES) electronic brake control module (EBCM) calibration may be the other possible cause.

C0296 - Transfer Case Delivered Torque for Stability Control System Circuit
http://www.obd-codes.com/trouble_codes/obd-ii-c-chassis-codes.php

Sounds like a wheel bearing and or the brake pads are totally gone which is most likely. Change the pads.

c0040 indicates right front wheel sensor, so problem is more than likely sensor or wiring to it. c0245 indicates wheel speed sensor frequency error. This confirms wheel sensor or wiring.

c0040 right front abs sensor.
P0300 random or multiple misfire.
p0303 cylinder 3 misfire
this code P0300 and this one p0303 will be the same problem as they both same coding.
C0040 it can be the cable is cut or the sensor is defective.

C0040 ABS light on GM Saab Ricks Free Auto Repair Advice

Will be located near the wheel hub. As long as there is no physical damage I would guess you will be replacing the sensor