P135B Code - Ignition Coil Supply Voltage Circuit Bank 2
Quick Answer
The diagnostic trouble code P135B refers to an issue with the Ignition Coil Supply Voltage Circuit in Bank 2 of the vehicle's engine. Common causes include Faulty ignition coil: A failing or defective ignition coil can disrupt the supply voltage in Bank 2, Wiring issues: Corrosion, damage, or loose connections in the wiring harness can cause voltage supply problems, ECM malfunction: A malfunctioning engine control module (ECM) can affect the ignition coil supply voltage. 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 Faulty ignition coil: A failing or defective ignition coil can disrupt the supply voltage in Bank 2, Wiring issues: Corrosion, damage, or loose connections in the wiring harness can cause voltage supply problems, ECM malfunction: A malfunctioning engine control module (ECM) can affect the ignition coil supply voltage.
- 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 P135B Description
The diagnostic trouble code P135B refers to an issue with the Ignition Coil Supply Voltage Circuit in Bank 2 of the vehicle's engine. This code indicates that there is a problem with the voltage supply to the ignition coil in the second bank of cylinders. The ignition coil is a crucial component in the ignition system, responsible for converting the low voltage from the battery into the high voltage needed to create a spark in the spark plugs, which in turn ignites the air-fuel mixture in the combustion chamber.
Common Causes of P135B
- Faulty ignition coil: A failing or defective ignition coil can disrupt the supply voltage in Bank 2.
- Wiring issues: Corrosion, damage, or loose connections in the wiring harness can cause voltage supply problems.
- ECM malfunction: A malfunctioning engine control module (ECM) can affect the ignition coil supply voltage.
- Power supply problems: Issues with the battery or alternator can impact the voltage supply to the ignition coil.
- Sensor issues: Problems with sensors related to the ignition system can also trigger this code.
Symptoms of P135B
- Misfires: The engine may misfire or have a rough idle due to inconsistent ignition coil voltage.
- Decreased engine performance: The vehicle may experience a loss of power or acceleration.
- Poor fuel efficiency: A decrease in fuel efficiency may be noticed due to incomplete combustion.
- Stalling: The engine may stall unexpectedly, especially at idle or low speeds.
- Check Engine Light: The Check Engine Light may illuminate on the dashboard, indicating a problem with the ignition coil supply voltage circuit.
How to Fix P135B
- Diagnose the issue: Use a diagnostic scanner to retrieve the specific trouble code and perform voltage tests on the ignition coil in Bank 2.
- Inspect wiring and connections: Check the wiring harness for any damage, corrosion, or loose connections, and repair or replace as needed.
- Test the ignition coil: Test the ignition coil in Bank 2 to determine if it is functioning correctly. Replace it if necessary.
- Check the ECM: Inspect the engine control module for any signs of malfunction and repair or replace if needed.
- Clear the trouble code: After completing the repairs, clear the trouble code using a diagnostic scanner to reset the Check Engine Light.
Cost to Fix P135B
The typical repair costs for addressing the Ignition Coil Supply Voltage Circuit issue in Bank 2 can range from $150 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more accurate estimate. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher at dealerships or metropolitan areas and lower at independent shops.
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Code P135B 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
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.
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