P135A Cadillac Code - Ignition Coil Supply Voltage Circuit Bank 1
Quick Answer
The P135A code for Cadillac vehicles refers to an issue with the Ignition Coil Supply Voltage Circuit on Bank 1. Common causes include Faulty ignition coil, Wiring issues in the ignition coil circuit, Faulty ignition coil driver module. 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 Cadillac indicates Ignition Coil Supply Voltage Circuit Bank 1.
- Common causes
- Common causes include Faulty ignition coil, Wiring issues in the ignition coil circuit, Faulty ignition coil driver module.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P135A Cadillac Description
The P135A code for Cadillac vehicles refers to an issue with the Ignition Coil Supply Voltage Circuit on Bank 1. This means that there is a problem with the circuit that provides power to the ignition coil for the cylinders on bank 1 of the engine. The ignition coil is responsible for generating the high voltage needed to ignite the air-fuel mixture in the engine cylinders. When this circuit is not functioning properly, it can lead to misfires, rough idling, and overall poor engine performance.
Common Causes of P135A Cadillac
- Faulty ignition coil
- Wiring issues in the ignition coil circuit
- Faulty ignition coil driver module
- ECM (Engine Control Module) failure
- Loose or corroded electrical connections
Symptoms of P135A Cadillac
- Engine misfires
- Rough idling
- Loss of power
- Engine stalling
- Illumination of the check engine light
How to Fix P135A Cadillac
- Diagnose the issue with a scan tool to confirm the P135A code.
- Inspect the wiring and connections in the ignition coil circuit.
- Test the ignition coil and ignition coil driver module for proper function.
- Replace any faulty components, such as the ignition coil or driver module.
- Clear the code and test drive the vehicle to ensure the issue is resolved.
Cost to Fix P135A Cadillac
The cost to repair the Ignition Coil Supply Voltage Circuit on Bank 1 can vary depending on the specific cause of the issue and the cost of parts and labor in your area. On average, the repair cost for this issue can range from $150 to $500. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's best to get a quote from a trusted mechanic before proceeding with the repair.
Need more information about the P135A Cadillac code?
Need more information on how to fix the P135A Cadillac code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P135A Cadillac code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P135A Cadillac Code
1. What does the OBDII code P135A mean on a Cadillac?
Code P135A indicates an issue with the ignition coil supply voltage circuit in Bank 1, which may affect the engine's ability to fire properly.
2. What are the common symptoms of code P135A on a Cadillac?
Common symptoms include engine misfires, rough idling, reduced power, increased fuel consumption, and the check engine light turning on.
3. What causes the P135A code to appear on a Cadillac?
Potential causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a failing powertrain control module (PCM), or a weak battery.
4. Can I drive my Cadillac with the P135A code?
Driving with this code is not recommended, as it can cause further damage to the engine and catalytic converter if left unresolved.
5. How is the P135A code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the ignition coil and related wiring, and perform voltage and continuity tests on the circuit.
6. How do I fix the P135A code on my Cadillac?
Repairs may involve replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, or addressing issues with the PCM.
7. How much does it cost to fix the P135A code on a Cadillac?
Repair costs can vary, but replacing an ignition coil typically costs $150–$300, including parts and labor. Wiring repairs or PCM replacement may increase costs.
8. Can a dead battery trigger the P135A code on a Cadillac?
Yes, a weak or dead battery can cause voltage irregularities in the ignition coil circuit, potentially triggering this code.
9. What tools are needed to troubleshoot the P135A code?
A scan tool, multimeter, and basic hand tools are typically required to diagnose and repair issues related to this code.
10. Does replacing the ignition coil always fix the P135A code?
Not always. While a faulty ignition coil is a common cause, you should also inspect the wiring, connectors, and PCM to ensure the root issue is resolved.
Discuss the causes and fixes for P135A Cadillac OBDII Code
Code P135A Cadillac comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.