Mechanics

ABS BRAKE CODES

2003 Cadillac DTS • V8 FWD Automatic • 85,000 miles

My abs light is on I took it to a small shop he put it on the machine an it came back with these codes c1214 and c1248 what are these codes an how to repair or how much to repair.
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Blackboydee
December 9, 2010.




The c 1248 sets because the c1214 set. The C1214 relates to the ABS pump and/or relay which is internal to the EBCM. You may be faced with just the EBCM, or both it and the valve. These are expensive parts if bought new, in excess of $1000. Here is the trouble code test chart.

DTC C1214
Circuit Description
The system relay is energized when the ignition is ON. The system relay supplies voltage to the solenoid valves and the pump motor. This voltage is referred to as the system voltage.

The electronic brake control module (EBCM) controls each solenoid valve by grounding the solenoid.

The EBCM controls the pump motor by grounding the control circuit. The pump serves 2 purposes: Transfers brake fluid from the brake calipers to the master cylinder reservoir during pressure decrease events.

Transfers brake fluid from the master cylinder reservoir to the brake calipers during pressure increase events.

Conditions for Running the DTC
The ignition voltage is greater than 10.5 volts.

The system relay is commanded ON.

Conditions for Setting the DTC
The system voltage is less than 8 volts for 0.23 seconds.

Action Taken When the DTC Sets
If equipped, the following actions occur: The EBCM disables the DRP/ABS/TCS/VSES for the duration of the ignition cycle.

The ABS indicator turns ON.

The Traction Control indicator turns ON.

The DIC displays the Service Stability System message.

The EBCM will also set DTC C1248.

The red Brake warning indicator turns ON.

Conditions for Clearing the DTC
The condition for the DTC is no longer present and the DTC is cleared with a scan tool.

The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids
The system relay is integral to the EBCM. The relay is not serviceable.

Test Description
The number below refers to the step number on the diagnostic table.

Determines whether the DTC is current.

Step
Action
Values
Yes
No

Schematic Reference: Antilock Brake System Schematics

Connector End View Reference: Antilock Brake System Connector End Views

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.
Use the scan tool in order to clear the DTCs.
With the scan tool, perform the Automated Test.
Does the DTC reset as a current DTC?
--
Go to Step 3
Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

3
Disconnect the pump motor harness pigtail connector of the brake pressure modulator valve (BPMV).
Measure the resistance between each pump motor control circuit and the housing of the BPMV at the pump motor harness pigtail connector of the BPMV.
Does the DMM display the specified value?
OL
Go to Step 5
Go to Step 4

4
Important: Perform the setup procedure for the EBCM. An unprogrammed EBCM will result in the following conditions: Inoperative or poorly functioning system operations

The EBCM sets DTC C1248 and DTC C1255m3

Replace the EBCM and the BPMV. Refer to Electronic Brake Control Module Replacement and Brake Pressure Modulator Valve Replacement.

Did you complete the repair?
--
Go to Step 6
--

5
Important: Perform the setup procedure for the EBCM. An unprogrammed EBCM will result in the following conditions: Inoperative or poorly functioning system operations

The EBCM sets DTC C1248 and DTC C1255m3

Replace the EBCM. Refer to Electronic Brake Control Module Replacement.

Did you complete the repair?
--
Go to Step 6
--

6
Use the scan tool in order to clear the DTCs.
With the scan tool, perform the Automated Test.
Does the DTC reset?
--
Go to Step 2
System OK

Factoryjack
Dec 10, 2010.


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