22-05-2025
5 min.
735

P2514 Event Data Recorder Request Circuit High

P2514 is a generic OBD-II diagnostic trouble code that indicates the Engine Control Module (ECM) or Powertrain Control Module (PCM) has detected that the Event Data Recorder (EDR) Request Circuit voltage is higher than the manufacturer-specified operating range. In other words, the ECM has identified an abnormally high voltage signal in the circuit used to communicate with the Event Data Recorder or related control modules.

The Event Data Recorder (EDR) is an electronic system built into many modern vehicles that automatically records important operating data before, during, and immediately after significant events such as collisions or airbag deployment. Depending on the manufacturer, the recorded information may include vehicle speed, engine RPM, throttle position, brake pedal application, steering angle, seat belt usage, and other safety-related parameters.

When the ECM detects excessive voltage in the EDR request circuit, it stores diagnostic code P2514 and illuminates the Check Engine Light. Although this code rarely affects engine performance directly, it can interfere with communication between safety-related control modules.

What Does P2514 Mean?

Modern vehicles use multiple electronic control modules connected through the Controller Area Network (CAN).

The Event Data Recorder exchanges information with systems such as:

Engine Control Module (ECM)
Airbag Control Module (SRS)
Body Control Module (BCM)
Anti-lock Braking System (ABS)
Transmission Control Module (TCM)

The EDR Request Circuit carries signals between these modules whenever data recording or communication is required.

If the ECM detects that the request circuit voltage exceeds the expected operating range, it stores diagnostic code P2514.

Unlike P2513, which indicates low voltage, P2514 specifically identifies an overvoltage condition in the request circuit.

Common Symptoms of P2514

In many cases, drivers may not notice any obvious drivability problems because the Event Data Recorder operates independently of engine management.

Common symptoms include:

Check Engine Light illuminated
Airbag warning light on some vehicles
Additional communication-related diagnostic trouble codes
Diagnostic scanner communication problems
Intermittent instrument cluster warning messages
Certain advanced driver assistance features may become unavailable
Body or chassis control module faults

Most vehicles continue to drive normally despite the stored code.

Common Causes of P2514

An excessively high voltage in the Event Data Recorder request circuit is usually caused by electrical faults or communication problems.

Short to battery voltage

A wiring short may allow battery voltage to enter the request circuit.

Damaged wiring

The wiring harness may develop:

Melted insulation
Pinched wires
Heat damage
Chafed insulation
Improper repairs

Loose electrical connectors

Poor connector contact may create unstable voltage conditions.

Corroded connectors

Corrosion may interfere with normal circuit operation.

Faulty Body Control Module (BCM)

A malfunctioning BCM may transmit an excessively high voltage signal.

Faulty Airbag Control Module

Because the Event Data Recorder is often integrated with the Supplemental Restraint System, an internal SRS module fault may trigger this code.

Charging system overvoltage

A faulty alternator or voltage regulator may raise system voltage above normal operating limits.

CAN bus communication faults

Network communication problems can occasionally produce abnormal circuit voltage readings.

Improper aftermarket electrical installation

Incorrectly installed alarms, remote starters, lighting systems, or audio equipment may interfere with communication circuits.

ECM malfunction

Although uncommon, an internal ECM fault may incorrectly interpret the request circuit voltage.

Vehicles Commonly Affected by P2514

P2514 can occur on many OBD-II vehicles equipped with integrated Event Data Recorder systems.

Frequently affected vehicles include:

Ford F-150
Ford Explorer
Chevrolet Silverado
Chevrolet Equinox
GMC Sierra
Ram 1500
Jeep Grand Cherokee
Toyota Camry
Toyota RAV4
Honda Accord
Honda CR-V
Nissan Altima
Nissan Rogue
Hyundai Tucson
Kia Sportage
BMW 3 Series
Mercedes-Benz C-Class
Audi A4
Volkswagen Passat
Subaru Forester

The code is more common on vehicles equipped with advanced electronic safety systems and extensive communication networks.

How Is P2514 Diagnosed?

Diagnosing P2514 requires evaluating both the electrical circuit and the communication network.

Check for additional diagnostic trouble codes

Related codes involving:

Airbag system
CAN communication
Charging system
Body Control Module
ABS
Battery voltage

can provide valuable diagnostic information.

Inspect wiring and connectors

Technicians inspect the request circuit for:

Melted insulation
Wiring shorts
Loose connectors
Corrosion
Heat damage
Water intrusion

Measure circuit voltage

A digital multimeter is used to verify that circuit voltage remains within manufacturer specifications.

Inspect charging system

Battery voltage and alternator output should be checked to ensure the electrical system is not producing excessive voltage.

Inspect related fuses

All fuses supplying the ECM, BCM, SRS module, and communication circuits should be tested.

Review live scan data

A professional scan tool allows technicians to monitor:

Module communication
Network voltage
Event Data Recorder status
Battery voltage
Charging system voltage

Inspect previous repairs

Vehicles with accident repairs or aftermarket electrical modifications should be inspected carefully for wiring errors.

How to Fix P2514

The proper repair depends on the cause of the excessive circuit voltage.

Common repairs include:

Repairing wiring shorted to battery voltage
Replacing damaged wiring harnesses
Cleaning corroded electrical connectors
Repairing loose electrical connections
Repairing damaged CAN bus wiring
Replacing blown or damaged fuses
Replacing a faulty alternator or voltage regulator
Repairing water-damaged connectors
Replacing a faulty Body Control Module
Replacing a faulty Airbag Control Module if necessary
Correcting improperly installed aftermarket electrical accessories
Updating module software if recommended by the manufacturer
Replacing the ECM if internal failure is confirmed

After repairs are completed, the diagnostic code should be cleared and the communication network should be tested to verify proper operation.

Can You Drive With P2514?

In most cases, yes, the vehicle remains drivable because this code usually does not interfere directly with engine operation.

However, continued driving without diagnosis is not recommended because:

Communication between safety-related modules may be unreliable.
Advanced safety systems may become limited.
Additional communication faults may develop.
Electrical overvoltage can affect other electronic components.

If an airbag warning light or multiple electronic warning lights are illuminated, the vehicle should be inspected as soon as possible.

Is P2514 a Serious Code?

P2514 is generally considered a moderately serious diagnostic trouble code.

Although it usually does not cause immediate drivability issues, it may affect communication between important electronic control modules responsible for safety and vehicle diagnostics.

Ignoring the problem may eventually lead to:

Additional network communication faults
Reduced functionality of safety systems
Diagnostic communication failures
Electrical system instability
Difficulty diagnosing future electronic problems

Prompt repair helps maintain reliable operation of the vehicle's electronic systems.

How to Prevent P2514

Routine maintenance of the vehicle's electrical and communication systems can help reduce the likelihood of this fault.

Recommended preventive maintenance includes:

Inspect wiring harnesses regularly for damage.
Keep electrical connectors clean and dry.
Repair damaged wiring immediately.
Protect connectors from water intrusion.
Test the charging system periodically.
Replace damaged fuses with the correct rating.
Address communication or airbag warning lights promptly.
Inspect electrical wiring carefully after collision repairs.
Ensure aftermarket electrical accessories are installed correctly.

Maintaining the vehicle's electrical system helps ensure reliable communication between all control modules.

Final Thoughts

P2514 Event Data Recorder Request Circuit High indicates that the ECM has detected an abnormally high voltage in the Event Data Recorder request circuit. The most common causes include wiring shorted to battery voltage, damaged wiring, corroded connectors, charging system overvoltage, CAN bus communication faults, faulty Body Control Module, malfunctioning Airbag Control Module, improperly installed aftermarket electrical accessories, or previous repair-related wiring issues. Although an internal ECM fault is possible, external electrical problems are much more common.

While this code typically does not affect normal driving performance, it can interfere with communication between important electronic safety modules and should be repaired promptly. Correcting the underlying electrical fault restores proper communication, supports reliable Event Data Recorder operation, and helps protect the vehicle's electronic systems from unnecessary voltage-related problems.