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AutoCodes – Mercury – B1310 Mercury

B1310 Mercury Code - Run/Start Control Circuit Short to Ground or Open

Quick Answer

When the ignition switch is turned to the RUN position, a voltage signal is sent to the Body Control Module (BCM). Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
B1310 Mercury indicates Run/Start Control Circuit Short to Ground or Open.
Common causes
Common causes include Faulty Ignition Switch, Ignition Switch harness is open or shorted, Ignition Switch circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 805
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Nov 29, 2024
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Code B1310 Mercury Description

When the ignition switch is turned to the RUN position, a voltage signal is sent to the Body Control Module (BCM). The BCM then activates the run/start relay and the run/acc relay, which distribute fused voltage to various components. The run/acc relay is serviced as part of the BCM. the BCM continuously monitors the control side of the run/start relay. This Diagnostic Trouble Code (DTC) sets if the BCM detects an open or a short to ground on the control circuit. The BCM uses a Field-Effect Transistor (FET) to control the run/start relay. When this DTC sets, the control side of the run/start relay is disabled via the FET. Once the condition that caused the DTC to set is repaired, the BCM must pass a self-test in order for the DTC to clear and the system to resume normal operation.
OBDII Code B1310 Mercury - Run/Start Control Circuit Short to Ground or Open - AutoCodes.com
B1310 Mercury Code - Run/Start Control Circuit Short to Ground or Open
What does this mean?

What are the Possible Causes of the DTC B1310 Mercury?

  • Faulty Ignition Switch
  • Ignition Switch harness is open or shorted
  • Ignition Switch circuit poor electrical connection
  • Faulty Run/Start Relay
  • Faulty Body Control Module (BCM

How to Fix the DTC B1310 Mercury?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B1310 Mercury code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B1310 Mercury code?

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Need Help with the Code?

Get the B1310 Mercury code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B1310 Mercury Code

1. What does the OBDII code B1310 mean on a Mercury?

Code B1310 indicates a problem in the Run/Start Control Circuit, typically caused by a short to ground or an open circuit.

2. What are the symptoms of the B1310 code in a Mercury vehicle?

Symptoms may include the engine not starting, intermittent starting issues, or the inability to switch the ignition to the "Run" or "Start" position.

3. What causes the B1310 code to appear?

Common causes include damaged wiring, a faulty ignition switch, a defective relay, or poor electrical connections in the Run/Start circuit.

4. How is the B1310 code diagnosed?

A technician will inspect the wiring and connectors in the Run/Start circuit, test the ignition switch, and use a multimeter to check for shorts or open circuits.

5. Can I drive my Mercury with the B1310 code active?

Driving may not be possible if the engine doesn’t start. If it does start, the vehicle could experience intermittent issues, so it’s best to address the problem promptly.

6. How do I fix the B1310 code on my Mercury?

Repairs may involve replacing damaged wiring, fixing poor connections, or replacing a faulty ignition switch or relay.

7. Can a dead battery trigger the B1310 code?

A dead or weak battery alone is unlikely to trigger the code, but it can exacerbate electrical issues in the Run/Start circuit.

8. What tools are needed to fix the B1310 code?

Basic tools include a multimeter for electrical testing, wire repair tools, and possibly a scan tool to confirm the repair by clearing the code.

9. Is the B1310 code specific to Mercury vehicles?

While other manufacturers may use similar codes, B1310 specifically refers to a Run/Start circuit issue in Mercury and some Ford vehicles.

10. How much does it cost to repair the B1310 code?

Repair costs depend on the root cause. Wiring repairs may cost $50-$200, while replacing an ignition switch or relay could range from $150 to $400.

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