AutoCodes – Generic – P135B

P135B Code - Ignition Coil Supply Voltage Circuit Bank 2

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: P135B indicates Ignition Coil Supply Voltage Circuit Bank 2.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 13,008

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P135B 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 P135B - Ignition Coil Supply Voltage Circuit Bank 2 - AutoCodes.com — P135B Code - Ignition Coil Supply Voltage Circuit Bank 2

What does this mean?

What are the Possible Causes of the DTC P135B?

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 P135B?

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 P135B 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 P135B code?

Need more information on how to fix the P135B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P135B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P135B BMW — Knock Sensor Signal 2 Signal Implausible
P135B Buick — Ignition Coil Supply Voltage Circuit Bank 2
P135B Cadillac — Ignition Coil Supply Voltage Circuit Bank 2
P135B Chevrolet — Ignition Coil Supply Voltage Circuit Bank 2
P135B GMC — Ignition Coil Supply Voltage Circuit Bank 2
P135B MINI — Knock Sensor Signal 2 Signal Implausible

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 P135B Code

1. What are the common symptoms of OBDII code P135B (Ignition Coil Supply Voltage Circuit Bank 2)?

Symptoms may include engine misfires, rough idling, loss of power, and illuminated Check Engine Light.

2. What could cause OBDII code P135B to trigger?

Potential causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, or issues with the engine control module (ECM).

3. How can I diagnose the source of OBDII code P135B?

Use a scan tool to check for the code, visually inspect the ignition coil and related components for damage, and perform voltage tests to identify any electrical issues.

4. Can driving with OBDII code P135B active cause further damage to the vehicle?

Continuing to drive with this code may lead to more severe engine problems, reduced fuel efficiency, and potential damage to the catalytic converter.

5. What is the typical repair process for OBDII code P135B?

The repair process usually involves replacing the faulty ignition coil, repairing damaged wiring or connectors, and clearing the code with a scan tool.

6. Are there any DIY tips for addressing OBDII code P135B?

While it's possible to replace the ignition coil yourself, it's recommended to have a professional diagnose the issue to ensure proper repairs and prevent further damage.

7. How much does it cost to fix OBDII code P135B at a repair shop?

Repair costs can vary depending on the extent of the issue, but replacing an ignition coil may range from $100 to $300, including parts and labor.

8. Can OBDII code P135B be intermittent or occur sporadically?

Yes, this code can sometimes appear intermittently, especially if the underlying issue is related to loose or damaged wiring connections.

9. Is it safe to drive my vehicle with OBDII code P135B temporarily?

It's recommended to address this code promptly to prevent potential damage to the engine or other components. Avoid prolonged driving with the code active.

10. Will resetting the Check Engine Light also clear OBDII code P135B?

Resetting the Check Engine Light may temporarily clear the code, but if the underlying issue persists, the code is likely to reappear.