GM Service Manual Online
For 1990-2009 cars only

Object Number: 519691  Size: MF
ABS Components
Antilock Brake System Schematics
Antilock Brake System Schematic Icons

Circuit Description

The PCM monitors various parameters and will not allow traction control operation if any parameter falls below a specified value.

Conditions for Setting the DTC

The PCM detects a malfunction and then causes TCS shut down until the malfunction has been corrected

Action Taken When the DTC Sets

    • A DTC C0240 is stored
    • The TCS is disabled
    • The TRAC OFF indicator is turned on
    • If the TCS is again allowed to function, the indicator will be turned off but the DTC will be stored

Conditions for Clearing the DTC

    • The condition for the DTC is no longer present and the scan tool clear DTC function is used
    • 100 ignition cycles have passed with no DTCs detected

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step checks if DTC C0240 resets.

DTC C0240 PCM Traction Control not Allowed

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Go to Diagnostic System Check - ABS

2

  1. Turn the ignition switch to the RUN position with the engine off.
  2. Using a Scan Tool, read the ABS/TCS DTCs.

Are any other DTCs set?

--

Go to Diagnostic Trouble Code (DTC) List/Type for the appropriate DTC table

Go to Step 3

3

Is DTC C0240 set as a current code?

--

Go to Step 5

Go to Step 4

4

  1. Using the scan tool clear the DTC.
  2. Remove the scan tool from the DLC.
  3. Carefully drive the vehicle above 12 Km/h (8 mph) for several minutes.

Did DTC C0240 set as a current DTC?

--

Go to Step  5

Go to Diagnostic System Check - ABS

5

Perform the Powertrain OBD System Check. Refer in Powertrain On Board Diagnostic (OBD) System Check .

Did the vehicle pass the OBD System Check?

--

Go to Diagnostic Aids

Go to Powertrain Control Module Diagnosis