DTC C1275 PCM Requested ETS to Be Disabled. Buick Regal (China) (CNG) 1999

For 1990-2009 cars only

Makes 🢒 Buick 🢒 1999 🢒 Regal (China) (CNG) 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C1275 PCM Requested ETS to Be Disabled

ABS Components
Antilock Brake System Schematics
Data Link Connector Schematics
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice

Circuit Description

The PCM monitors various parameters. The PCM will not allow operation of the Enhanced Traction system (ETS) if any PCM parameter falls below a predetermined value.

Conditions for Setting the DTC

When a malfunction is detected by the PCM, the PCM causes the ETS to shutdown until the malfunction is corrected.

Action Taken When the DTC Sets

This DTC is a temporary operational malfunction.

The following actions are taken when the DTC sets:

•	A malfunction DTC is stored.

•	The ETS is disabled.

•	The TRAC OFF indicator is turned ON.

The ABS remains functional.

If the ETS is no longer inhibited, the indicator lamp will be turned OFF but the DTC will still be stored.

Conditions for Clearing the DTC

ETS will remain disabled until the EBTCM receives a traction allowed message from the PCM. When the EBTCM receives this message, it re-enables the ETS and turns OFF the TRAC OFF indicator.

Diagnostic Aids

Check for PCM DTCs. If no PCM DTC is stored, DTC C1275 may have set due to a hot engine or a hot transaxle (both normal conditions). No repairs should be made to the ETS System.

Perform a thorough inspection of the wiring and the connectors.

Failure to carefully inspect wiring may result in a misdiagnosis. A misdiagnosis may result in replacing parts without repairing the malfunction.

Step	Action	Value(s)	Yes	No
1	Was the Diagnostic System Check performed?	--	Go to Step 2	Go to Diagnostic System Check - ABS
2	Turn the ignition switch to the RUN position, engine off. Use the Scan Tool in order to read the DTCs. Make note of the DTCs. Are any other ABS or PCM DTCs set?	--	Go to Diagnostic Trouble Code (DTC) List Diagnostic Trouble Code (DTC) List or Diagnostic Trouble Code (DTC) List	Go to Step 3
3	Clear the DTCs. Turn the ignition switch to the OFF position. Turn the ignition switch to the RUN position, engine off. Does DTC C1275 reset?	--	Go to Step 5	Go to Step 4
4	Start the engine and test drive the vehicle at a speed of at least 16 km/h (10 mph). Initiate an enhanced traction assisted take off. Repeat the above drive cycle sequence two more times. Did the DTC C1275 set in these last three drive cycles?	--	Go to Step 5	Go to Diagnostic System Check - ABS
5	Perform a Powertrain OBD System Check. Refer to A Powertrain On Board Diagnostic (OBD) System Check or A Powertrain On Board Diagnostic (OBD) System Check in Engine Controls. Did the vehicle pass the OBD system check?	--	Go to Step 6	Go to Diagnostic Trouble Code (DTC) List or Diagnostic Trouble Code (DTC) List
6	Replace the EBTCM. Refer to Electronic Brake Control Module/Electronic Brake and Track Control Module Replacement . Is the repair complete?	--	Go to Diagnostic System Check - ABS	--