P0358 Cadillac Code - Ignition Coil 8 Control Circuit
Quick Answer
The ignition system on this engine uses ignition coils with integrated power transistors. Common causes include Faulty Ignition Coil 8, Ignition Coil 8 harness is open or shorted, Ignition Coil 8 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
- P0358 Cadillac indicates Ignition Coil 8 Control Circuit.
- Common causes
- Common causes include Faulty Ignition Coil 8, Ignition Coil 8 harness is open or shorted, Ignition Coil 8 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.
Code P0358 Cadillac Description
What are the Possible Causes of the DTC P0358 Cadillac?
- Faulty Ignition Coil 8
- Ignition Coil 8 harness is open or shorted
- Ignition Coil 8 circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0358 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 P0358 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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Frequently Asked Questions about P0358 Cadillac Code
1. What does the OBDII code P0358 mean on a Cadillac?
P0358 indicates an issue with the ignition coil "8" control circuit, suggesting a malfunction in the coil, wiring, or related components.
2. What are the common symptoms of code P0358 on a Cadillac?
Symptoms may include engine misfires, rough idling, reduced power, poor fuel economy, and the Check Engine Light illuminating.
3. What causes the P0358 code to appear on a Cadillac?
Common causes include a faulty ignition coil, damaged wiring or connectors, a malfunctioning powertrain control module (PCM), or poor electrical connections.
4. Can a bad spark plug cause the P0358 code?
While unlikely, a bad spark plug could stress the ignition coil and contribute to the issue, but the code specifically points to the coil or circuit.
5. How do I diagnose the P0358 code on my Cadillac?
Inspect the ignition coil 8, check the wiring and connectors for damage or corrosion, test the coil's resistance, and verify PCM functionality.
6. Can I drive my Cadillac with a P0358 code?
Driving with this code is not recommended as it can cause engine misfires, reduced performance, and potential damage to the catalytic converter.
7. How much does it cost to fix the P0358 code on a Cadillac?
Repair costs vary but typically range from $100 to $300, depending on whether the ignition coil, wiring, or PCM needs replacement.
8. How do I fix the P0358 code on a Cadillac?
Repairs may include replacing the ignition coil 8, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if needed.
9. Does clearing the P0358 code fix the problem?
Clearing the code resets the Check Engine Light but does not address the underlying issue; proper diagnosis and repair are necessary.
10. What tools are needed to troubleshoot the P0358 code on a Cadillac?
You’ll need an OBDII scanner, a multimeter for testing electrical components, and possibly a repair manual specific to your Cadillac model.
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