C1239 Code - Foreign Object Attached on Tip of Left Rear Sensor
Quick Answer
The diagnostic code C1239 indicates that there is a foreign object attached to the tip of the left rear sensor in the vehicle's braking system. Common causes include Debris or dirt accumulation around the sensor, Loose or damaged sensor mounting, Impact from road debris or objects. 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
- C1239 indicates Foreign Object Attached on Tip of Left Rear Sensor.
- Common causes
- Common causes include Debris or dirt accumulation around the sensor, Loose or damaged sensor mounting, Impact from road debris or objects.
- 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 C1239 Description
The diagnostic code C1239 indicates that there is a foreign object attached to the tip of the left rear sensor in the vehicle's braking system. This can lead to inaccurate readings from the sensor, potentially causing issues with the vehicle's stability control system. The sensor is responsible for detecting wheel speed and relaying this information to the vehicle's computer system to help regulate the braking force applied to each wheel. If a foreign object is obstructing the sensor, it can lead to incorrect data being transmitted, resulting in compromised braking performance and potentially affecting the vehicle's overall safety.
Common Causes of C1239
- Debris or dirt accumulation around the sensor
- Loose or damaged sensor mounting
- Impact from road debris or objects
- Corrosion or rust on the sensor tip
- Improper sensor installation or maintenance
Symptoms of C1239
- ABS warning light illuminated on the dashboard
- Traction control system malfunction
- Inconsistent braking performance
- Unusual noises coming from the rear of the vehicle
- Difficulty maintaining control during braking or slippery conditions
How to Fix C1239
- Inspect the left rear sensor for any foreign objects attached to the tip.
- Remove any debris or dirt obstructing the sensor.
- Check the sensor mounting for proper alignment and secure any loose components.
- Test the sensor's functionality by driving the vehicle and monitoring the ABS and traction control systems.
- Clear the diagnostic trouble code and reset the vehicle's computer system if necessary.
Cost to Fix C1239
The typical repair costs for addressing a foreign object attached to the tip of the left rear sensor can vary depending on the specific vehicle make and model, as well as the location and labor rates of the auto repair shop. On average, the repair for this issue may range from $100 to $300, including parts and labor. It is recommended to consult with a professional mechanic or auto repair shop for an accurate estimate based on your vehicle's specific needs. Keep in mind that additional diagnostic time may be required to pinpoint the exact cause of the issue before repairs can be made.
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Code C1239 Information for Specific Makes
- C1239 Buick — Brake Pressure Sensor 1/2 Correlation
- C1239 Cadillac — Brake Pressure Sensor 1/2 Correlation
- C1239 Chevrolet — Brake Pressure Sensor 1/2 Correlation
- C1239 GMC — Brake Pressure Sensor 1/2 Correlation
- C1239 Lexus — Foreign Object Attached on Tip of Left Rear Sensor
- C1239 Scion — Foreign Object Attached on Tip of Left Rear Sensor
- C1239 Toyota — Foreign Object Attached on Tip of Left Rear Sensor
Frequently Asked Questions about C1239 Code
1. What does the OBDII code C1239 mean?
C1239 indicates that a foreign object is detected on the tip of the left rear sensor, potentially interfering with its proper function.
2. What are the common symptoms of code C1239?
Symptoms can include erratic readings from the left rear sensor, warning lights on the dashboard (e.g., ABS or traction control), or reduced functionality of driver-assist systems.
3. What causes OBDII code C1239 to appear?
The code is typically caused by debris, mud, ice, or a physical obstruction on the left rear sensor, or a damaged sensor tip.
4. How can I fix the C1239 code?
Inspect the left rear sensor for any debris or foreign objects and clean it carefully. If the sensor is damaged, it may need to be replaced.
5. Can I drive with the C1239 code active?
While the vehicle may still be drivable, safety systems like ABS or traction control may not function properly, so it's best to address the issue promptly.
6. How do I clean the left rear sensor to clear the C1239 code?
Gently wipe the sensor with a soft, damp cloth to remove dirt or debris. Avoid using abrasive materials that could damage the sensor.
7. Will clearing the C1239 code solve the problem?
Clearing the code without addressing the root cause may result in the code reappearing. Ensure the sensor is cleaned or repaired before resetting the code.
8. Can a damaged sensor wire cause the C1239 code?
Yes, a damaged or disconnected wire to the left rear sensor can sometimes trigger this code.
9. What tools are needed to diagnose the C1239 code?
A basic OBDII scanner can read the code, but a visual inspection of the sensor and its surroundings is also necessary.
10. Is the C1239 code specific to certain vehicles?
Yes, the code and its description may apply to specific vehicle makes and models, so refer to your vehicle’s service manual for exact details.
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