P0135 Cadillac Code - HO2S Heater Performance Bank 1 Sensor 1
Quick Answer
Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0135 Cadillac indicates HO2S Heater Performance Bank 1 Sensor 1.
- Common causes
- Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1, Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0135 Cadillac Description
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S 1 heater current is out of factory specifications.
What are the Possible Causes of the DTC P0135 Cadillac?
- Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 1
- Heated Oxygen Sensor Bank 1 Sensor 1 harness is open shorted
- Heated Oxygen Sensor Bank 1 Sensor 1 circuit poor electrical connection
- Heated Oxygen Sensor Bank 1 Sensor 1 circuit fuse
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0135 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.
Code Tech Notes
User Submitted Video
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0135 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.
Need more information about the P0135 Cadillac code?
Need more information on how to fix the P0135 Cadillac code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0135 Cadillac code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0135 Cadillac Code
1. What does the OBDII code P0135 mean on a Cadillac?
P0135 indicates a malfunction in the heater circuit of the oxygen sensor (Bank 1, Sensor 1), which may prevent the sensor from reaching its operating temperature quickly.
2. What are the symptoms of code P0135 in a Cadillac?
Common symptoms include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and potential difficulty passing emissions tests.
3. What causes code P0135 on a Cadillac?
The most common causes are a faulty oxygen sensor, damaged wiring or connectors in the heater circuit, or a blown fuse related to the sensor.
4. Can I drive my Cadillac with code P0135?
While the vehicle may still be drivable, prolonged driving with this code can lead to reduced fuel efficiency and potential damage to the catalytic converter.
5. How do I fix the P0135 code on a Cadillac?
Repairs may include replacing the faulty oxygen sensor, repairing damaged wiring, checking and replacing blown fuses, or addressing issues in the engine control module (ECM).
6. How can I confirm if the oxygen sensor is bad for code P0135?
You can test the heater circuit's resistance with a multimeter or use a scan tool to monitor the sensor's performance. If the readings are out of range, the sensor is likely faulty.
7. Which oxygen sensor is affected by code P0135 on a Cadillac?
P0135 specifically refers to the oxygen sensor on Bank 1 (the side of the engine with cylinder 1), Sensor 1 (the upstream sensor before the catalytic converter).
8. Can a dirty or clogged catalytic converter cause code P0135?
No, a dirty or clogged catalytic converter typically won't cause P0135. This code relates specifically to the oxygen sensor's heater circuit, not the catalytic converter's condition.
9. Is a blown fuse a common reason for code P0135 on a Cadillac?
Yes, a blown fuse in the oxygen sensor heater circuit can prevent the sensor from functioning properly and trigger the P0135 code.
10. How much does it cost to fix code P0135 on a Cadillac?
Repair costs can vary but typically range from $150 to $400, depending on whether you need a new oxygen sensor, wiring repairs, or other fixes.
Discuss the causes and fixes for P0135 Cadillac OBDII Code
Code P0135 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.
