The dreaded check engine light illuminates your 2012 Audi A6 supercharged dashboard. You connect your OBD-II scanner and retrieve the cryptic code P2138. What does it mean, and more importantly, what should you do? This article will delve into the notorious P2138 code, specifically concerning the 2012 Audi A6 supercharged, and guide you through understanding the related Technical Service Bulletin (TSB) and potential solutions.

Understanding the P2138 Code on a 2012 Audi A6 Supercharged

The P2138 code signifies a “Throttle/Pedal Position Sensor/Switch ‘D’/’E’ Voltage Correlation.” Simply put, the car’s computer detects a mismatch between two throttle position sensors. This discrepancy can lead to performance issues ranging from a rough idle to reduced power and even limp mode. While this code can occur in various vehicles, it’s somewhat prevalent in the 2012 Audi A6 supercharged model, often linked to a specific TSB.

What is a TSB and Why Does it Matter for the 2012 Audi A6 Supercharged P2138 Code?

A Technical Service Bulletin (TSB) is a document released by the vehicle manufacturer (in this case, Audi) to address known issues affecting specific models. TSBs provide valuable information for technicians and car owners alike, outlining the problem, diagnostic steps, and recommended repair procedures. For the 2012 Audi A6 supercharged and the P2138 code, a TSB often points to faulty throttle position sensors or wiring issues.

Troubleshooting the P2138 Code: A Step-by-Step Guide

1. Check the Wiring: Before replacing any parts, thoroughly inspect the wiring harness connected to the throttle position sensors. Look for any signs of damage, corrosion, or loose connections. A simple wiring repair can sometimes resolve the issue.
2. Inspect the Throttle Body: Examine the throttle body for carbon buildup or other obstructions. A dirty throttle body can interfere with the sensor’s readings.
3. Test the Throttle Position Sensors: Using a multimeter, test the voltage readings from the throttle position sensors. Compare the readings with the manufacturer’s specifications to identify any discrepancies.
4. Consult the TSB: Locate the relevant TSB for the 2012 Audi A6 supercharged and the P2138 code. The TSB will provide specific guidance for diagnosing and resolving the issue, often recommending the replacement of specific components.

Wiring Harness Inspection for P2138 Code

Why is my 2012 Audi A6 Supercharged throwing a P2138 code?

Several factors can trigger the P2138 code, including faulty throttle position sensors, wiring problems, or even a malfunctioning Engine Control Module (ECM). However, the specific TSB for the 2012 Audi A6 supercharged often implicates the throttle position sensors as the primary culprit.

“In my experience, the P2138 code on a 2012 Audi A6 supercharged almost always points to the throttle position sensors. The TSB provides a clear roadmap for diagnosis and repair,” says Michael Becker, ASE Certified Master Technician.

How do I fix the P2138 code on my 2012 Audi A6 Supercharged?

The most effective fix typically involves replacing the throttle position sensors as outlined in the TSB. However, addressing any underlying wiring issues is crucial to prevent the problem from recurring.

Conclusion: Tackling the 2012 Audi A6 Supercharged Code P2138

The P2138 code on a 2012 Audi A6 supercharged can be a frustrating issue. However, understanding the code, consulting the relevant TSB, and following the appropriate diagnostic steps can lead to a successful resolution. By addressing the underlying cause, you can restore your Audi’s performance and prevent future occurrences of this troublesome code. For further assistance or a professional diagnosis, connect with us at VCDStool. Contact us at +1 (641) 206-8880 and our email address: vcdstool@gmail.com or visit our office at 6719 W 70th Ave, Arvada, CO 80003, USA.

FAQ

1. What does the P2138 code mean? It indicates a voltage correlation issue between the throttle position sensors.
2. Is the P2138 code serious? It can lead to drivability issues and should be addressed promptly.
3. Can I drive my car with a P2138 code? It’s advisable to avoid driving until the issue is resolved.
4. Where can I find the TSB for the 2012 Audi A6 supercharged P2138 code? Check the NHTSA website or consult an authorized Audi dealer.
5. How much does it cost to fix the P2138 code? The cost varies depending on the repair needed but typically involves the cost of the sensors and labor.
6. Can I fix the P2138 code myself? While some DIYers may be capable, it’s often best to consult a qualified technician.
7. What happens if I ignore the P2138 code? It can potentially lead to further damage and more expensive repairs down the line.