C0387 on Cadillac
Manufacturer-Specific Chassis Code (commonly transfer case / shift-related on GM)
C0387 on Cadillac vehicles indicates manufacturer-specific chassis code (commonly transfer case / shift-related on gm). Au7o has documented this code across 1 Cadillac model — most commonly on Escalade ESV. C0387 is a manufacturer-specific chassis code that falls in a range largely reserved/non-standardized under SAE, so its exact meaning varies by manufacturer. On many GM vehicles it appears alongside transfer-case encoder/shift codes and is generally associated with an inability to complete a requested shift or a related transfer-case/electronic shift fault. Because the precise definition is not standardized, the code should be confirmed against the specific vehicle's service information. In general it points to a chassis driveline or shift-control concern rather than the engine itself. Typical repair costs on Cadillac range from $250 to $600, depending on the specific model and root cause.
Common Causes of C0387
- •Transfer case encoder motor or shift fault (GM applications)
- •Damaged or corroded wiring/connectors in the affected circuit
- •Failed shift motor or actuator
- •Control module (e.g., transfer case control module) fault
- •Low system voltage or poor ground
- •Mechanical binding in the shift mechanism
C0387 on Cadillac by Model
Cadillac Escalade ESV(1 issue)
- Transfer Case Encoder Motor and Position Sensor Failure2002-2020
The transfer case encoder motor that controls AWD/4WD engagement fails, causing the "Service 4WD" message and preventing 4WD engagement. The position sensor inside the encoder motor sends incorrect signals. The transfer case may also develop an internal fluid leak past the front output seal.
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View C0387 across all makes →Frequently Asked Questions
What does C0387 mean on Cadillac?▼
C0387 stands for "Manufacturer-Specific Chassis Code (commonly transfer case / shift-related on GM)." C0387 is a manufacturer-specific chassis code that falls in a range largely reserved/non-standardized under SAE, so its exact meaning varies by manufacturer. On many GM vehicles it appears alongside transfer-case encoder/shift codes and is generally associated with an inability to complete a requested shift or a related transfer-case/electronic shift fault. Because the precise definition is not standardized, the code should be confirmed against the specific vehicle's service information. In general it points to a chassis driveline or shift-control concern rather than the engine itself. On Cadillac specifically, this code is documented across 1 model.
What causes C0387 on Cadillac vehicles?▼
Common causes on Cadillac: Transfer case encoder motor or shift fault (GM applications), Damaged or corroded wiring/connectors in the affected circuit, Failed shift motor or actuator, Control module (e.g., transfer case control module) fault, Low system voltage or poor ground. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix C0387 on a Cadillac?▼
Repair costs on Cadillac range from $250 to $600, depending on the specific model and root cause.
Which Cadillac models have C0387 documented?▼
Au7o has documented C0387 on 1 Cadillac model: Escalade ESV.