AutoCodes – Generic – P135A

P135A Code - Ignition Coil Supply Voltage Circuit Bank 1

Quick Answer

The ignition system uses an individual ignition coil for each cylinder. Common causes include Blown Ignition Coil Fuse, Ignition Coil Fuse harness is open or shorted, Ignition Coil Fuse 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: P135A indicates Ignition Coil Supply Voltage Circuit Bank 1.
Common causes: Common causes include Blown Ignition Coil Fuse, Ignition Coil Fuse harness is open or shorted, Ignition Coil Fuse 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 5,471

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 Aug 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P135A Description

The ignition system uses an individual ignition coil for each cylinder. The Engine Control Module (ECM) monitors the ignition voltage from the fuse to the individual coils. The Diagnostic Trouble Code (DTC) will be set if the ECM detects less than 2.5 V on the ignition coil supply voltage circuit.

OBDII Code P135A - Ignition Coil Supply Voltage Circuit Bank 1 - AutoCodes.com — P135A Code - Ignition Coil Supply Voltage Circuit Bank 1

What does this mean?

What are the Possible Causes of the DTC P135A?

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

How to Fix the DTC P135A?

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 P135A 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 P135A code?

Need more information on how to fix the P135A code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P135A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P135A Buick — Ignition Coil Supply Voltage Circuit Bank 1
P135A Cadillac — Ignition Coil Supply Voltage Circuit Bank 1
P135A Chevrolet — Ignition Coil Supply Voltage Circuit Bank 1
P135A GMC — Ignition Coil Supply Voltage Circuit Bank 1

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 P135A Code

1. What are the common symptoms of OBDII code P135A (Ignition Coil Supply Voltage Circuit Bank 1)?

- Common symptoms include engine misfires, rough idling, loss of power, and illuminated check engine light.

2. What can cause the OBDII code P135A to trigger?

- The code can be triggered by issues such as a faulty ignition coil, wiring problems in the ignition coil circuit, or a problem with the power supply to the ignition coil.

3. How can I diagnose the OBDII code P135A?

- Diagnosis typically involves using a scan tool to read the code, checking the ignition coil for proper functioning, and inspecting the wiring and connections related to the ignition coil.

4. What are the potential effects of ignoring the OBDII code P135A?

- Ignoring the code can lead to further engine performance issues, decreased fuel efficiency, and potential damage to other engine components over time.

5. Can I continue driving my vehicle with the OBDII code P135A present?

- It is not recommended to continue driving the vehicle with the code present as it can lead to more serious issues and potential safety hazards.

6. How can I repair the OBDII code P135A?

- Repair options may include replacing the faulty ignition coil, repairing any damaged wiring, ensuring proper power supply to the ignition coil, and clearing the error code.

7. Are there any preventive measures to avoid OBDII code P135A in the future?

- Regular maintenance, such as checking and replacing ignition components as needed, can help prevent the recurrence of the code.

8. Can a DIY enthusiast fix the OBDII code P135A issue?

- Depending on the skill level and experience of the individual, a DIY enthusiast may be able to fix the issue by following repair guides and using the necessary tools.

9. Will resetting the error code resolve the OBDII code P135A permanently?

- Resetting the error code may temporarily clear the check engine light, but if the underlying issue is not addressed, the code is likely to reappear.

10. Is it advisable to seek professional help for the OBDII code P135A?

- Seeking professional help from a certified mechanic is recommended to accurately diagnose and repair the issue, ensuring the proper functioning of the ignition system.