AutoCodes – Cadillac – P0815 Cadillac

P0815 Cadillac Code - Upshift Switch Circuit

Quick Answer

The Driver Shift Request (DSR) allows the driver to select the desired range of gears for current driving conditions. Common causes include Faulty Transmission Shift Lever, Transmission Shift Lever harness is open or shorted, Transmission Shift Lever 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: P0815 Cadillac indicates Upshift Switch Circuit.
Common causes: Common causes include Faulty Transmission Shift Lever, Transmission Shift Lever harness is open or shorted, Transmission Shift Lever 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.

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Code Popularity 408

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 02, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0815 Cadillac Description

The Driver Shift Request (DSR) allows the driver to select the desired range of gears for current driving conditions. The DSR shift system is activated when the gear selector is in the manual position. The DSR system is deactivated in all other range positions. Pressing the plus (+) switch once will command the Body Control Module (BCM) to signal the Transmission Control Module (TCM) to upshift to the next high gear. Pressing the minus (−) switch once will command the BCM to signal the TCM to downshift to the next lowest or previous gear. The TCM will not allow a downshift if the transmission is compromised by over-speeding. The automatic transmission manual shift switch is comprised of three different resistor values in series and two switches. The BCM supplies a 12-volt circuit to the automatic transmission manual shift switch. The signal circuit varies the voltage back to the body control module depending on which switch is depressed. The Diagnostic Trouble Code (DTC) will be set when the BCM detects a stuck On Tap Up switch for 1 second in Park or Neutral or the BCM detects a stuck On Tap Up switch for 10 minutes in any forward gear.

OBDII Code P0815 Cadillac - Upshift Switch Circuit - AutoCodes.com — P0815 Cadillac Code - Upshift Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P0815 Cadillac?

Faulty Transmission Shift Lever
Transmission Shift Lever harness is open or shorted
Transmission Shift Lever circuit poor electrical connection
Faulty Body Control Module (BCM)

How to Fix the DTC P0815 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 P0815 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0815 Cadillac Code

1. What are the common symptoms of OBDII code P0815 in a Cadillac related to the Upshift Switch Circuit?

- Common symptoms include issues with the upshifting function, such as difficulty changing gears or erratic shifting patterns.

2. What could cause the OBDII code P0815 Upshift Switch Circuit to trigger in a Cadillac?

- The code may be triggered due to a faulty upshift switch, damaged wiring, a defective transmission control module (TCM), or a poor electrical connection.

3. How can I diagnose the cause of OBDII code P0815 in my Cadillac?

- Diagnosing the issue involves inspecting the upshift switch, checking the wiring for any damage, testing the TCM, and ensuring all electrical connections are secure.

4. Can driving with an unresolved P0815 OBDII code cause further damage to my Cadillac?

- Continuing to drive with this code may result in poor shifting performance, potential transmission damage, and reduced fuel efficiency over time.

5. Is it safe to continue driving my Cadillac with the Upshift Switch Circuit issue until I can repair it?

- It is not recommended to drive the vehicle with unresolved upshifting problems, as it can lead to unsafe driving conditions and potential damage to the transmission.

6. How can I reset the OBDII code P0815 in my Cadillac after making repairs to the Upshift Switch Circuit?

- To reset the code, you can use an OBDII scanner to clear the code after resolving the underlying issue with the upshift switch circuit.

7. Are there any DIY repair tips for fixing the OBDII code P0815 related to the Upshift Switch Circuit in a Cadillac?

- DIY repair tips include checking and replacing the upshift switch, inspecting and repairing any damaged wiring, and ensuring all connections are tight and secure.

8. How much does it typically cost to repair the OBDII code P0815 Upshift Switch Circuit issue in a Cadillac?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the upshift switch, repairing wiring, or addressing TCM problems, with costs ranging from $100 to $500 or more.

9. Can a mechanic easily fix the OBDII code P0815 in a Cadillac, or is it a complex repair?

- A qualified mechanic should be able to diagnose and repair the Upshift Switch Circuit issue in a Cadillac with the right tools and expertise, making it a manageable repair for most automotive professionals.

10. How important is it to address the OBDII code P0815 Upshift Switch Circuit problem promptly in a Cadillac?

- It is crucial to address the issue promptly to ensure proper transmission function, safe driving conditions, and to prevent potential damage to other components in the vehicle.