2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2431
Code (DTC) List - Vehicle) for further diagnosis.
瀚慖f there are no EBCM DTCs set, refer to the following:
* Symptoms - Antilock Brake System (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Antilock Brake System) for the ABS - Hybrid
* Symptoms - Antilock Brake System (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Antilock Brake System) for the ABS - Non-Hybrid Less than 3900 kg
(8600 lb) GVW
* Symptoms - Antilock Brake System (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Testing and
Inspection/Symptom Related Diagnostic Procedures/Symptoms - Antilock Brake System) for the ABS - Non-Hybrid Greater than/Equal
to 3900 kg (8600 lb) GVW
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the
conditions that you observed from the Freeze Frame/Failure Records data.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
P1381
DTC P1380 or P1381
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provide an overview of each diagnostic category.
DTC Descriptors
DTC P1380
- Misfire Detected - Rough Road Data Not Available
DTC P1381
- Misfire Detected - No Communication with Brake Control Module
System Description
The engine control module (ECM) detects engine misfire by detecting variations in crankshaft deceleration between firing strokes. For accurate
detection of engine misfire, the ECM must distinguish between crankshaft deceleration caused by actual misfire and deceleration caused by rough
road conditions. The antilock brake system (ABS) can detect if the vehicle is on a rough road based on wheel acceleration/deceleration data
supplied by the wheel speed sensors. If the ABS detects rough road above predetermined threshold, this information is sent to the ECM. The ECM
uses the rough road information when calculating engine misfire. If the ABS is malfunctioning and cannot detect rough roads, the misfire
diagnostic will continue to run; however, if an engine misfire DTC sets, this DTC also sets indicating that rough road data was not available, or
there was no communication with the brake control module during the misfire calculation due to an ABS malfunction.
Conditions for Running the DTC
* The vehicle speed is greater than 8 km/h (5 mph).
* The engine speed is less than 8,192 RPM.
* The engine load is less than 60 percent.
* Engine misfire is detected and DTC P0300 sets with the MIL illuminated.
* DTCs P1380 and P1381 run continuously when the above conditions are met.
Conditions for Setting the DTC
P1380
* The electronic brake control module (EBCM) sends a message to the ECM indicating that a failure has occurred in the EBCM.
* Engine misfire is detected and DTC P0300 sets with the MIL illuminated.
P1381
* An EBCM malfunction exists for more than 10 s, preventing the ECM from receiving rough road detection data.
* Engine misfire is detected and DTC P0300 sets with the MIL illuminated.
Action Taken When the DTC Sets
