P1381: Variable Cam Timing Over-Advanced (Bank 1)
5 vehicles · 3 makes · $60-$8,000 repair
Most Reported On
P1381 is an OBD-II diagnostic trouble code meaning “Variable Cam Timing Over-Advanced (Bank 1).” This manufacturer-specific code (most common on Ford/Lincoln/Mazda) means the engine computer detected that the Variable Cam Timing (VCT) on cylinder bank 1 has advanced beyond the allowed range, often alongside a detected misfire. Variable cam timing adjusts when the valves open and close to optimize power, economy, and emissions, and it relies on clean engine oil and a working solenoid. When timing drifts too far advanced, the engine can run rough and lose power. It is usually an oil-flow or solenoid issue rather than a sign the engine is destroyed. This code is most commonly reported on 1994-1999 Acura Integra, 1993-2001 Honda Prelude (Si, Si VTEC, SH, Type SH, Base), and 1993-1997 Honda del Sol (S, Si, VTEC), plus 2 other vehicles, with repair costs ranging from $60 to $8,000.
Common Causes
Typical Repair Cost
Based on 5 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
P1381 does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
Vehicles Affected (5)
H22/H23 distributor failure (TDC/cylinder-position sensor and internal bearing)
Distributor Internal Oil Seal / Bearing Failure
Internal distributor failure (ignitor/ICM, coil, and oil-seal leak) causing misfire and hot no-start
FAQ
What does P1381 mean?
P1381 stands for "Variable Cam Timing Over-Advanced (Bank 1)." This manufacturer-specific code (most common on Ford/Lincoln/Mazda) means the engine computer detected that the Variable Cam Timing (VCT) on cylinder bank 1 has advanced beyond the allowed range, often alongside a detected misfire. Variable cam timing adjusts when the valves open and close to optimize power, economy, and emissions, and it relies on clean engine oil and a working solenoid. When timing drifts too far advanced, the engine can run rough and lose power. It is usually an oil-flow or solenoid issue rather than a sign the engine is destroyed.
What are the most common causes of P1381?
The most common causes of P1381 are: Dirty or low engine oil restricting the VCT solenoid, Faulty or stuck variable cam timing (VCT) solenoid, Worn or stretched timing chain / guides, Faulty camshaft position sensor, Low engine oil pressure, Clogged oil passages or VCT actuator (phaser), Wiring or connector fault at the VCT solenoid. The specific cause varies by vehicle.
How much does it cost to fix P1381?
Repair costs for P1381 range from $60 to $8,000, depending on the vehicle and root cause.
Which vehicles are affected by P1381?
Au7o has documented P1381 across 5 vehicle models from 3 manufacturers: Acura, Ford, Honda.
Sources (12)
- ForumAnatomy of a B-series Distributor — Team Integra Forums
- ForumAcura Integra - distributor, no start (SOLVED) - Car Talk Community
- Forumwhat are symptoms of a bad distributor - 3geez Classic Honda
- ForumHow to tell if distributor is bad - Honda Prelude Online
- ForumSymptoms of a bad distributor - Honda-Tech
- articleA Guide to the 1993-1997 Honda Civic del Sol Distributor - Go-Parts
- ForumLeaking distributor seal: Symptoms? - Honda-Tech
- ForumOil Leak From Engine and Possible Check Engine Light - Honda Civic del Sol (RepairPal)
- ForumHonda Civic Distributor: A Guide for 1992-2000 Models
- ForumWhat are the symptoms of a bad distributor, coil, igniter - Honda-Tech
- articleHow To Test Misfire Codes (1995-2000 1.6L Honda Civic)
- RecallNHTSA Consumer Advisory for Campaign 07V336
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.