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P0355 Cadillac Code - Ignition Coil 5 Control Circuit

Quick Answer

The P0355 diagnostic trouble code (DTC) indicates a problem with the ignition coil 5 control circuit in a Cadillac vehicle. Common causes include Faulty ignition coil: The ignition coil itself may be defective and in need of replacement, Wiring issues: Damaged or corroded wiring connections to the ignition coil can disrupt the control circuit, Faulty spark plugs: Worn-out or damaged spark plugs can put added stress on the ignition coil, leading to failure. 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
P0355 Cadillac indicates Ignition Coil 5 Control Circuit.
Common causes
Common causes include Faulty ignition coil: The ignition coil itself may be defective and in need of replacement, Wiring issues: Damaged or corroded wiring connections to the ignition coil can disrupt the control circuit, Faulty spark plugs: Worn-out or damaged spark plugs can put added stress on the ignition coil, leading to failure.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P0355 Cadillac Description

The P0355 diagnostic trouble code (DTC) indicates a problem with the ignition coil 5 control circuit in a Cadillac vehicle. The ignition coil is responsible for generating the high voltage needed to ignite the air-fuel mixture in the combustion chamber. When this control circuit malfunctions, it can lead to misfires, rough idling, and overall poor engine performance. If left unaddressed, the issue can cause damage to the engine and result in decreased fuel efficiency.

OBDII Code P0355 Cadillac - Ignition Coil 5 Control Circuit
P0355 Cadillac Code - Ignition Coil 5 Control Circuit

Common Causes of P0355 Cadillac

  1. Faulty ignition coil: The ignition coil itself may be defective and in need of replacement.
  2. Wiring issues: Damaged or corroded wiring connections to the ignition coil can disrupt the control circuit.
  3. Faulty spark plugs: Worn-out or damaged spark plugs can put added stress on the ignition coil, leading to failure.
  4. Engine control module (ECM) malfunction: A problem with the ECM that controls the ignition system can trigger this code.

Symptoms of P0355 Cadillac

  1. Engine misfires: The most common symptom of a faulty ignition coil control circuit is engine misfires, which can be felt as a jerking or hesitation while driving.
  2. Rough idling: The engine may idle roughly or inconsistently, causing vibrations and noise.
  3. Decreased fuel efficiency: A malfunctioning ignition coil can lead to incomplete combustion, resulting in decreased fuel efficiency.
  4. Check Engine Light: The Check Engine Light may illuminate on the dashboard, indicating a problem with the ignition coil control circuit.

How to Fix P0355 Cadillac

  1. Diagnose the issue: Use a scan tool to retrieve the DTC and pinpoint the exact cause of the problem.
  2. Inspect wiring and connections: Check the wiring harness and connectors for any signs of damage or corrosion and repair or replace as necessary.
  3. Replace ignition coil: If the ignition coil is found to be faulty, it will need to be replaced with a new one.
  4. Test system: After repairs are made, test the ignition system to ensure proper functioning and clear the DTC.
  5. Clear codes: Use the scan tool to clear the DTC and reset the Check Engine Light.

Cost to Fix P0355 Cadillac

The cost of repairing a P0355 code in a Cadillac can vary depending on the specific model and year of the vehicle. Typically, the cost of replacing an ignition coil ranges from $100 to $300, while labor costs can range from $100 to $200. Overall, the total repair cost for this issue may range from $200 to $500. It's important to note that these estimates are general and actual costs may vary based on individual circumstances and the location of the repair shop.

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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 P0355 Cadillac Code

1. What does the OBD-II code P0355 mean on a Cadillac?

P0355 indicates a malfunction in the ignition coil "E" control circuit, typically corresponding to cylinder 5.

2. What are the common symptoms of code P0355 on a Cadillac?

Symptoms may include engine misfires, rough idling, poor acceleration, decreased fuel efficiency, and the Check Engine Light turning on.

3. What causes the P0355 code to appear on a Cadillac?

Common causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a malfunctioning PCM (Powertrain Control Module), or corroded electrical connections.

4. How can I diagnose the P0355 code on my Cadillac?

Start by inspecting the ignition coil on cylinder 5, checking for damage or loose connections. Use a multimeter to test circuit continuity and verify proper voltage. A scan tool can help monitor live data for abnormalities.

5. Can I drive my Cadillac with the P0355 code?

Driving with this code is not recommended, as it can lead to further engine damage, reduced performance, and increased emissions.

6. How do I fix the P0355 code on a Cadillac?

Repairs may include replacing the ignition coil on cylinder 5, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. How much does it cost to repair the P0355 code on a Cadillac?

The cost depends on the specific repair. Replacing an ignition coil typically costs $100–$300, while wiring repairs or PCM replacement can vary significantly.

8. Can a bad spark plug cause the P0355 code?

While P0355 specifically relates to the ignition coil circuit, a bad spark plug can indirectly contribute to misfire symptoms and should be inspected during diagnosis.

9. What tools are needed to fix the P0355 code on a Cadillac?

Common tools include an OBD-II scanner, a multimeter, and basic hand tools like screwdrivers and socket wrenches for coil replacement or wiring inspection.

10. Will clearing the P0355 code fix the problem?

Simply clearing the code won't fix the underlying issue. The problem must be diagnosed and repaired to prevent the code from returning.

Discuss the causes and fixes for P0355 Cadillac OBDII Code

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  • i have cadi sts 2006. i have changed all of the sparkplugs and ignition coils . i am still getting po303 po351 po353 and po355. i am wondering what else it could be. The engine misses at idle when you drive it. it seems to go away.

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