DTC P1380 for Chevrolet Lumina VE 2008
Diagnostic Instructions
DTC Descriptor
DTC P1380: Misfire Detected - Rough Road Data Not Available
Circuit/System Description
Correct engine misfire detection is dependent on whether or not the vehicle is experiencing a rough road condition. A rough road condition causes unexpected crankshaft fluctuations. In order to detect a rough road condition, the electronic brake control
module (EBCM) communicates a wheel speed signal over the serial data circuit to the engine control module (ECM). The wheel speed sensor information allows the ECM to distinguish if the crankshaft speed variations are caused by a rough road condition or are caused
by a true misfire.
Conditions for Running the DTC
| • | The engine is operating. |
| • | DTC P1380 runs continuously once the above conditions are met for greater than 5 seconds. |
Conditions for Setting the DTC
| • | The ECM detects an engine misfire while the rough road signal is unavailable. |
| • | The condition exists for greater than 4 seconds or a cumulative of 30 seconds. |
Action Taken When the DTC Sets
DTC P1380 is a Type C DTCs.
Conditions for Clearing the DTC
DTC P1380 is a Type C DTCs.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Start and idle the engine, observe the DTC information with a scan tool. DTC P1380 should not set.
Note: If any UXXXX DTCs are set, diagnose those first.
- 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 after completing the diagnostic procedure.
