AutoCodes – Cadillac – P2303 Cadillac

P2303 Cadillac Code - Ignition Coil 2 Control Circuit Low Voltage

Quick Answer

The ignition system on this engine uses ignition coils with integrated power transistors. Common causes include Faulty Ignition Coil 2, Ignition Coil 2 harness is open or shorted, Ignition Coil 2 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: P2303 Cadillac indicates Ignition Coil 2 Control Circuit Low Voltage.
Common causes: Common causes include Faulty Ignition Coil 2, Ignition Coil 2 harness is open or shorted, Ignition Coil 2 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 624

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 31, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2303 Cadillac Description

The ignition system on this engine uses ignition coils with integrated power transistors. The Engine Control Module (ECM) controls the spark event for each cylinder through individual ignition coil control circuits. When the ECM commands the ignition control circuit On, electrical current flows through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM commands the ignition control circuit Off, interrupting current flow through the primary winding. The collapsing magnetic field created by the primary winding induces a high voltage in the secondary winding, which is connected to the spark plugs. The Diagnostic Trouble Code (DTC) will be set when the control circuit commanded by the ECM state does not match the actual state.

OBDII Code P2303 Cadillac - Ignition Coil 2 Control Circuit Low Voltage - AutoCodes.com — P2303 Cadillac Code - Ignition Coil 2 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2303 Cadillac?

Faulty Ignition Coil 2
Ignition Coil 2 harness is open or shorted
Ignition Coil 2 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2303 Cadillac?

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 P2303 Cadillac 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.

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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 P2303 Cadillac Code

What does OBDII code P2303 mean for a Cadillac?

Code P2303 indicates an issue with the Ignition Coil 2 Control Circuit, specifically low voltage detected by the powertrain control module (PCM).

What are the common symptoms of code P2303 in a Cadillac?

Symptoms include engine misfires, poor performance, rough idling, reduced fuel efficiency, and possibly an illuminated check engine light.

What causes code P2303 on a Cadillac?

Common causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a bad PCM, or issues with the coil driver circuit.

How can I diagnose code P2303 on my Cadillac?

Start by inspecting the ignition coil, wiring, and connectors for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit.

Can a bad ignition coil cause code P2303?

Yes, a faulty ignition coil can prevent the proper voltage from being delivered, triggering the P2303 code.

How do I fix code P2303 on a Cadillac?

Repairs may involve replacing the ignition coil, repairing damaged wiring or connectors, or in rare cases, replacing the PCM.

Can I still drive my Cadillac with code P2303 active?

Driving with this code is not recommended, as it can lead to engine misfires, reduced performance, and potentially cause damage to other components.

Does code P2303 affect fuel efficiency on a Cadillac?

Yes, ignition coil issues can cause incomplete combustion, leading to decreased fuel efficiency.

How much does it cost to repair code P2303 on a Cadillac?

Costs vary but may range from $100â€“$300 for ignition coil replacement. Additional expenses may apply if wiring repairs or PCM replacement is needed.

Will clearing the code P2303 fix the problem permanently?

Clearing the code without addressing the underlying issue will likely result in the code returning and continued vehicle performance issues.