Buick Regal: DTC C1282

Diagnostic Instructions

• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provide an overview of each diagnostic category.

DTC Descriptors

DTC C1282

Rear Drive Clutch Classification Not Programmed

For symptom byte information, refer to Symptom Byte List.

Circuit/System Description

The rear differential clutch control module detects if the initial clutch classification calibration procedure has not been performed or has not been performed incorrectly. No external circuit diagnosis is involved.

Conditions for Running the DTC

• The engine is running.
• The engine speed is above 400 rpm.

Conditions for Setting the DTC

C1282 00

The rear differential clutch control module detects that the clutch classification has not been programmed.

Action Taken When the DTC Sets

• The electronic limited slip control is disabled.
• The AWD SERVICE message is displayed in the driver information center.

Conditions for Clearing the DTC

• The condition for the DTC is no longer present.
• The DTC is not detected in 40 consecutive ignition cycles.

Diagnostic Aids

• The clutch service calibration will be the alphanumeric characters of the supplier assigned unique serial number found etched/stamped on the clutch pack housing. The characters must be entered exactly how it appears etched/stamped on the clutch pack housing. The calibration procedure is done through SPS programming and setup.

NOTE: When entering the alphanumeric characters into the scan tool, be sure to enter the characters as seen.

For the single clutch system (RPO F46), there is only one clutch calibration alphanumeric code.

For the twin clutch system (RPO G99), there are two clutch calibration alphanumeric code. Both codes must be entered during the calibration procedure for the right and left clutch respectively.

• For the single clutch system (RPO F46), there is only one clutch calibration alphanumeric code.
• For the twin clutch system (RPO G99), there are two clutch calibration alphanumeric code. Both codes must be entered during the calibration procedure for the right and left clutch respectively.

Reference Information

Schematic Reference

Rear Axle Wiring Schematics

Connector End View Reference

COMPONENT CONNECTOR END VIEW INDEX

Description and Operation

Rear Drive Axle Description and Operation

Electrical Information Reference

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

1. Ignition ON.

2. Verify DTC C1282 is not set.

• If the DTC is set

1. Perform the rear differential clutch classification calibration procedure. Refer to K47 Rear Differential Clutch Control Module: Programming and Setup.
2. Verify the Rear Differential Clutch Factory Calibration parameter has stored the value used during the rear differential clutch classification calibration procedure.
3. Perform key cycle, ignition OFF then ON.
   • If the Rear Differential Clutch Factory Calibration parameter has not stored the value used during the rear differential clutch classification calibration procedure, replace the K47 Rear Differential Clutch Control Module.
   • Go to next step: If the Rear Differential Clutch Factory Calibration parameter has stored the value used during the rear differential clutch classification calibration procedure.
4. Verity DTC C1282 is not set.
   • If the DTC is set, replace the K47 Rear Differential Clutch Control Module.
   • Go to next step: If the DTC is not set
5. All OK.

• Go to next step: If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming, and setup.

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