What Does P1381 Mean?
This code indicates multiple issues: variable valve timing is over-advanced on bank 1, a misfire has been detected, and the ECM cannot communicate with the body control module. These combined faults suggest significant electrical or mechanical problems.
Safety Warning
Loss of BCM communication may affect safety systems including airbags, ABS, or stability control. VVT faults with misfires can cause severe drivability issues and engine damage.
Common Causes
30%
Communication network failure preventing ECM-BCM data exchange
25%
VVT solenoid stuck open causing excessive timing advance
20%
Low engine oil level or pressure affecting VVT operation
15%
Camshaft position sensor failure providing incorrect timing data
10%
ECM power or ground circuit fault causing multiple system errors
Diagnostic Steps
1
Step 1: Check engine oil level and condition; verify proper viscosity and fill level
2
Step 2: Scan BCM for codes and test communication network between ECM and BCM using bidirectional scan tool
3
Step 3: Monitor VVT solenoid operation and camshaft timing with scan tool live data during idle and acceleration
4
Step 4: Test VVT solenoid resistance and check for mechanical binding in VVT actuator
5
Step 5: Inspect ECM and BCM power and ground circuits for voltage drops or intermittent connections
Estimated Repair Cost
$300 - $1,500
Parts + labor, varies by vehicle and location
This code indicates multiple issues: variable valve timing is over-advanced on bank 1, a misfire has been detected, and the ECM cannot communicate with the body control module. These combined faults suggest significant electrical or mechanical problems.
The most common cause of P1381 (Variable Cam Timing Overadvanced (Bank #1)/ Misfire Detected - No Communication with BCM) is: Communication network failure preventing ECM-BCM data exchange
Typical repair costs for P1381 range from $300 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of BCM communication may affect safety systems including airbags, ABS, or stability control. VVT faults with misfires can cause severe drivability issues and engine damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1381 to identify the root cause.
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Quick Info
Category
Powertrain
System
Variable Valve Timing / Communication Network / Ignition System
Difficulty
Type
Manufacturer
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