DTC C1278 TCS Temporarily Inhibited By PCM. Cadillac Eldorado 2000

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2000 🢒 Eldorado 🢒 Body and Accessories 🢒 Instrument Panel, Gauges, and Console 🢒 DTC C1278 TCS Temporarily Inhibited By PCM

ABS Components
PWR, GND, Stoplamp Switch, Solenoid Valves, and Pump Motor
Handling ESD Sensitive Parts Notice
Battery Feeds
Power, Ground, and Class 2 (1 of 2)

Circuit Description

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

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The PCM diagnoses a condition preventing the engine control portion of the traction control function and sends a serial data message to the EBCM indicating that torque reduction is not allowed. The PCM will typically set a DTC and the EBCM will set this DTC.

Action Taken When the DTC Sets

•	The EBCM disables the TCS for the duration of the ignition cycle.

•	The TRACTION CONTROL indicator turns ON.

•	The ABS remains functional.

Conditions for Clearing the DTC

•	The condition for the DTC is no longer present (the DTC is not current) and you used the scan tool Clear DTC function.

•	The condition for the DTC is no longer present (the DTC is not current) and you used the On-Board Diagnostics Clear DTC function.

•	The EBCM automatically clears the history DTC when a current DTC is not detected in 50 consecutive drive cycles.

Diagnostic Aids

This DTC is for information only. As an aid to the technician, this DTC indicates that there are no problems in the ABS/TCS system.

Step	Action	Value(s)	Yes	No
1	Did you perform the ABS Diagnostic System Check?	--	Go to Step 2	Go to Diagnostic System Check - ABS
2	Install a scan tool. Turn ON the ignition, with the engine OFF. With the scan tool, observe the Delco/Bosch ABS/TCS ICCS (if equipped) DTCs. Does the scan tool display DTC C1278 set as a current code?	--	Go to Step 4	Go to Step 3
3	Start the engine. Carefully test drive the vehicle at a speed above the specified value. Use the scan tool in order to monitor the Delco/Bosch ABS/TCS ICCS (if equipped) DTCs. Repeat the drive cycle sequence twice. Did DTC C1278 set in the last 3 tests?	16 km/h (10 mph)	Go to Step 4	Go to Diagnostic Aids
4	Inspect the PCM. Refer to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls - 4.6L. Did you find and correct the condition?	--	Go to Step 5	Go to Diagnostic Aids
5	Use the scan tool in order to clear the DTCs. 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