P1386 — Variable Cam Timing Overadvanced (Bank #1)/ Misfire Detected - No Communication with BCM

P1386 — Variable Cam Timing Overadvanced (Bank #1)/ Misfire Detected - No Communication with BCM. A fault in the engine misfire monitoring. Short, gentle driving to a shop is usually possible. Typical causes: incorrect fuel pressure or a weak fuel pump, worn or fouled spark plugs, failed ignition coil or coil wiring.

For Ford vehicles

camshaft position timing over advanced bank 2

powertrain (engine/transmission)

Is it safe to drive?

Drive with caution Drive only as much as necessary. An active misfire sends unburned fuel into the exhaust and can destroy the catalytic converter within hours, especially if the Check Engine Light is flashing — in that case stop driving and diagnose immediately.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P1386 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the engine misfire monitoring for damage, corrosion, chafing or poor contact.
Subsystem check Read per-cylinder misfire counters in live data to identify the affected cylinder(s).
Subsystem check Swap ignition coils or injectors between cylinders and see if the misfire follows the part.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P1386 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P1386 (parts and labor, USD, independent shop rates): Replace an ignition coil: $150–$380; Replace spark plugs: $90–$250; Engine mechanical repair (compression): $800–$2,500; Clean or replace a fuel injector: $200–$600. Overall, fixing P1386 usually costs between $90 and $2,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

Will P1386 clear itself?

Sometimes P1386 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

What does OBD2 code P1386 mean?

What are the symptoms of P1386?

Drivers most often notice: loss of power during acceleration, increased fuel consumption, rough idle and engine shaking, Check Engine Light on or flashing.

Is it safe to drive with P1386?

Drive only as much as necessary. An active misfire sends unburned fuel into the exhaust and can destroy the catalytic converter within hours, especially if the Check Engine Light is flashing — in that case stop driving and diagnose immediately.

What is the most common cause of P1386?

The most common causes are: incorrect fuel pressure or a weak fuel pump, worn or fouled spark plugs, failed ignition coil or coil wiring.

When your vehicle's engine control unit detects something out of the ordinary with how the engine is firing, it logs a diagnostic trouble code. P1386 specifically points to a problem with variable cam timing being overadvanced on Bank 1, combined with a misfire condition and a breakdown in communication with the body control module. This powertrain fault code indicates that during the engine's monitoring cycle, the misfire detection system recorded readings outside acceptable parameters. The ECU accumulates data over multiple drive cycles before confirming the fault, at which point it stores P1386 alongside a freeze frame snapshot capturing engine RPM, load percentage, coolant temperature, and vehicle speed at the exact moment the problem occurred.

The misfire monitoring system works by analyzing crankshaft acceleration on each firing stroke. When cylinder combustion is weak or absent, the crankshaft slows slightly, which the position sensor detects and reports to the control module. If the pattern persists across enough cycles, the module sets P1386. The freeze frame data becomes valuable during diagnosis because it reveals what conditions triggered the code, whether the engine was under load, idling, cold, or operating at highway speeds. This context helps narrow down whether the root cause is mechanical, electrical, or fuel-related.

Several underlying problems can trigger P1386. The most frequent culprits involve components that directly affect combustion quality in one or more cylinders. When spark energy fails to ignite the air-fuel mixture properly, the engine misfires and the monitoring system detects the irregular crankshaft behavior. Mechanical wear, fuel delivery issues, and sensor problems all fall within the scope of this code.

Common Symptoms

Noticeable loss of power when you press the accelerator
Fuel economy drops noticeably compared to normal driving
Engine runs roughly at idle, with visible shaking or vibration
Check Engine Light illuminates on the dashboard
CEL flashes intermittently, especially under acceleration
A stronger-than-normal fuel smell from the exhaust

Likely Causes

Worn, fouled, or incorrectly gapped spark plugs
Failed ignition coil or damaged coil wiring/connectors
Low compression in one or more cylinders from mechanical wear
Clogged or leaking fuel injector affecting cylinder(s)
Faulty crankshaft or camshaft position sensor signals
Vacuum leak in the intake manifold allowing unmetered air to enter

How to Diagnose P1386

Plug in an OBD2 scanner and verify that P1386 is stored in the powertrain control module. Record the freeze frame data before clearing anything — that snapshot tells you engine conditions when the fault was detected.
Check for any related diagnostic trouble codes alongside P1386. Secondary codes often point directly to the failing component. Review manufacturer technical service bulletins for your specific make and model, as many P0xxx codes have documented software updates or factory-recommended repair procedures.
Perform a thorough visual inspection of wiring harnesses and connectors feeding the ignition system, fuel injectors, and position sensors. Look for damaged insulation, corrosion at terminals, chafing from contact with brackets, or loose connections.
Access live data on your scan tool and review per-cylinder misfire counters. This identifies which cylinder or cylinders are misfiring, allowing targeted testing rather than guessing.
Use a swap test to isolate faulty parts.交换点火线圈或喷油器 between cylinders with known-good units and monitor whether the misfire follows the part or stays in the original cylinder.
Clear P1386 after repairs and complete a full drive cycle that replicates the freeze frame conditions — the same RPM range, load, and temperature. Confirm the code does not return before considering the vehicle repaired.

Repair Options and Costs

Parts and labor estimates below reflect typical independent shop rates in USD:

Ignition coil replacement: $150–$380
Spark plug replacement: $90–$250
Fuel injector cleaning or replacement: $200–$600
Engine mechanical repair for compression issues: $800–$2,500

The total cost to repair P1386 typically falls between $90 and $2,500 depending on which component failed. Begin with the least expensive possibilities — inspect and replace spark plugs or ignition coils first before committing to major engine work. Proper diagnosis before purchasing parts prevents wasted money on components that are not actually causing the problem.

Can You Drive with P1386?

Exercise caution. Continued operation with an active cylinder misfire allows unburned fuel to pass into the exhaust stream, where it can overheat and destroy the catalytic converter in a short time. If the Check Engine Light is flashing, this indicates a severe misfire occurring right now — stop driving and address the problem immediately. Limit driving to the minimum necessary to reach a repair facility if the light is steady but the code remains stored.