B1314 — Battery Saver Relay Coil Circuit Open

How much does it cost to fix B1314?

Replace an ignition coil — $150–$380; Replace spark plugs — $90–$250; Repair coil wiring or connector — $80–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.

How do I diagnose B1314 myself?

Start with a scan: confirm B1314, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the battery saver relay coil, and verify the suspect component against live data before buying parts.

Is it safe to drive with B1314?

Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.

What is the most common cause of B1314?

The most common causes are: damaged coil wiring or connector, worn spark plugs or wrong plug gap, failed ignition coil or coil pack.

What does OBD2 code B1314 mean?

Battery Saver Relay Coil Circuit Open (B1314): a body electrical fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by damaged coil wiring or connector, worn spark plugs or wrong plug gap, failed ignition coil or coil pack.

OBD2 code B1314 points to a problem with the battery saver relay coil circuit — specifically, an open condition in that circuit. When the vehicle's computer detects that the electrical path for this relay coil has been interrupted, it logs B1314 in its memory, typically only after confirming the fault across multiple check cycles. The battery saver relay plays a role in managing power distribution when the ignition is off, and an open circuit means the relay coil never receives the signal it needs to function.

An open circuit simply means electricity cannot complete its journey through that particular pathway. Something has broken the connection — whether that is a severed wire, a connector that has come loose or developed corrosion at its pins, a fuse that has blown, or a component that has failed internally and no longer conducts. The engine control module expects to see a specific electrical behavior from this circuit, and when it sees nothing, B1314 gets set.

To reach the threshold for storing this code, the control module compares live sensor readings against its programmed parameters over more than one drive cycle. This prevents false triggers from a single glitch. When the fault is confirmed, the module also saves a freeze frame — a snapshot of engine operating conditions at the exact moment the failure occurred, including rpm, engine load, coolant temperature, and vehicle speed. Reviewing that snapshot before diving into diagnostics often points you directly at the root cause and keeps you from chasing the wrong system.

Common symptoms of B1314

• Check Engine Light is illuminated
• Engine misfires, either under acceleration or while idling
• Noticeable loss of power and hesitant or jerky acceleration
• Fuel economy has gotten worse than usual
• Engine is difficult to start, especially in wet or humid conditions

What causes B1314?

• Blown fuse supplying power to the battery saver relay coil circuit
• Battery saver relay coil itself has failed internally (open coil)
• Electrical connector is unplugged, a pin has backed out, or corrosion is blocking the signal
• Broken or frayed wire somewhere in the relay coil harness
• Moisture or oil present in the spark plug wells
• Spark plugs are worn, fouled, or have an incorrect gap setting
• Ignition coil or coil pack has failed
• Wiring or connector for the coil circuit is damaged
• Faulty ignition control signal coming from the ECM itself

How to diagnose B1314

1. Plug in an OBD2 scanner, verify that B1314 is stored, and capture the freeze frame data — this record shows exactly what the engine was doing when the fault was detected and is the best starting point for any diagnosis.
2. Look at any other stored codes for patterns. Codes that appear alongside B1314 often point to the real underlying problem. Check for relevant technical service bulletins (TSB) for your specific make and model — many electrical faults have known fixes or software updates published by the manufacturer; search by VIN on the manufacturer website or at nhtsa.gov.
3. Perform a detailed visual inspection of the wiring harness and connectors tied to the battery saver relay coil circuit. Look for damaged insulation, corrosion buildup, pins that are pushed back or out of position, and any signs of heat damage or chafing.
4. Use a multimeter to check continuity through the entire circuit from end to end. While measuring, gently wiggle the harness — a reading that jumps around indicates an intermittent open that may not show up when the wire is stationary.
5. If an ignition coil is accessible, swap it with one from another cylinder and clear the code. If B1314 moves to a different cylinder, the coil is the problem; if it stays put, the issue is elsewhere in the circuit.
6. Remove and inspect the spark plugs for wear, carbon fouling, oil contamination, or gaps that are out of spec. Replace as needed.
7. After repairs, clear the code and run the vehicle through a complete drive cycle, including the conditions recorded in the freeze frame. B1314 should not return if the fault is truly fixed.

How to fix B1314

Work from the simplest and least expensive possibilities toward the more costly ones:

• Ignition coil replacement — $150–$380
• Spark plug replacement — $90–$250
• Coil circuit wiring or connector repair — $80–$250

How much does it cost to fix B1314?

The total bill hinges entirely on which part is actually at fault. Here are typical scenarios for B1314, including parts and labor at independent shop rates in the United States:

• Ignition coil replacement: $150–$380
• Spark plug replacement: $90–$250
• Coil circuit wiring or connector repair: $80–$250

Most B1314 repairs fall in the $80 to $380 range. Getting an accurate diagnosis before purchasing parts is the single best way to keep costs down — the most expensive fix is rarely the first thing to check.

Can you drive with B1314?

Use caution and avoid putting heavy loads on the engine. Ignition-related faults cause misfires, and sustained misfiring generates enough unburned fuel to overheat and destroy the catalytic converter. If the Check Engine Light is flashing rather than steady, stop driving immediately and address the problem before continuing — a flashing light signals a severe misfire condition that demands prompt repair.

Related OBD2 codes

• B1300: Power Door Lock Circuit Failure
• B1301: Power Door Lock Circuit Open
• B1302: Accessory Delay Relay Coil Circuit Failure
• B1303: Accessory Delay Relay Coil Circuit Open
• B1304: Accessory Delay Relay Coil Circuit Short To Battery
• B1305: Accessory Delay Relay Coil Circuit Short To Ground