P135A Cadillac 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 Cadillac 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.
Code P135A Cadillac Description
What are the Possible Causes of the DTC P135A 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 P135A 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 P135A 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 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.
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