C1239

C1239-EMISSION ROLLS TEST ACTIVE

For a complete wiring diagram, refer to the Wiring Information.

NOTE: The Electronic Stability Control (ESC) may also be referred to as Electronic Stability Program (ESP) depending on the vehicle model year and configuration. Certain components may also reference ESP, ESC, or use the traction control symbol.

- When Monitored:
Continuously with the ignition on and no BUS communication failure DTCs present.

- Set Condition:
If the Anti-lock Brake Module receives two messages in a row indicating that the extended diagnostic session is active. ABS is inhibited during the extended diagnostic session.





1. DTC IS PRESENT

NOTE: Make sure the battery is fully charged.

1. Turn the ignition on.
2. With the scan tool clear DTCs.
3. Turn the ignition off.
4. Turn the ignition on.
5. Using the scan tool, read DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Go To 3

2. ANTI-LOCK BRAKE MODULE
1. Turn the ignition on.
2. Using the scan tool, select View DTCs in each module on the CAN B BUS and the CAN C BUS.

Are there CAN BUS communication DTCs present in any other module?

Yes

- Perform the appropriate diagnostic procedure before continuing with this test. Testing and Inspection.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Replace the Anti-lock Brake System (ABS) Module.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

3. INTERMITTENT COMMUNICATION DTC
1. The condition necessary to set this DTC is not present at this time.
2. This DTC will set if the ABS Module receives two messages in a row from the TIPM indicating that the Emissions Rolls test is active.
3. Using the scan tool, select View DTCs in each of the modules on the CAN B BUS and the CAN C BUS. If there are any communications DTCs present, perform the appropriate diagnostic procedure. Testing and Inspection.
4. Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Test complete, the condition or conditions that originally set this DTC are not present at this time.