P135B Cadillac 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 Cadillac 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.
Code P135B Cadillac Description
What are the Possible Causes of the DTC P135B Cadillac?
- 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 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 P135B 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 P135B Cadillac Code
What does the OBDII code P135B mean on a Cadillac?
The P135B code indicates an issue with the ignition coil supply voltage circuit for Bank 2, meaning the power supply to one or more ignition coils is disrupted.
What are the common symptoms of the P135B code?
Symptoms include engine misfires, rough idling, reduced power, poor fuel economy, and the check engine light being illuminated.
What causes the P135B code to appear?
Causes can include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a blown fuse, or issues with the powertrain control module (PCM).
How do you diagnose the P135B code on a Cadillac?
Diagnosis involves inspecting the ignition coil wiring and connectors, testing the ignition coil for proper function, checking for blown fuses, and verifying the PCM is functioning correctly.
Can a faulty ignition coil trigger the P135B code?
Yes, a malfunctioning ignition coil on Bank 2 can disrupt the supply voltage and trigger the P135B code.
Is it safe to drive with the P135B code active?
It’s not recommended to drive with this code active, as it can lead to engine misfires, reduced performance, and potential damage to other engine components.
How can I fix the P135B code on my Cadillac?
Repairs may involve replacing a faulty ignition coil, repairing or replacing damaged wiring, inspecting and replacing a blown fuse, or reprogramming or replacing the PCM if necessary.
How much does it cost to repair the P135B code?
The cost varies depending on the root cause, with ignition coil replacement typically costing $150–$300, while wiring repairs or PCM replacement may cost more.
Can a weak battery cause the P135B code?
A weak or failing battery can potentially cause voltage irregularities that affect the ignition coil circuit, leading to the P135B code.
What tools are needed to troubleshoot the P135B code?
Common tools include an OBDII scanner, a digital multimeter for testing voltage, and basic hand tools for inspecting and repairing wiring or components.
Discuss the causes and fixes for P135B Cadillac OBDII Code
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