AutoCodes – GMC – B2502 GMC

B2502 GMC Code - Park Relay Shorted To Ground

Quick Answer

When transaxle is in Park, Platform Zone Module (PZM) controls park relay output low to enable Brake Transaxle Shift Interlock (BTSI). Common causes include Faulty Park Relay, Park Relay harness is open or shorted, Park Relay 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: B2502 GMC indicates Park Relay Shorted To Ground.
Common causes: Common causes include Faulty Park Relay, Park Relay harness is open or shorted, Park Relay 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 779

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 Dec 16, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2502 GMC Description

When transaxle is in Park, Platform Zone Module (PZM) controls park relay output low to enable Brake Transaxle Shift Interlock (BTSI). PZM will continuously monitor this voltage at PZM. The Diagnostic Trouble Code (DTC) B2502 will set when park relay output is not active, and PZM determines output is low for 2 consecutive monitoring cycles. DTC B2502 will clear when park relay output is not active, and PZM determines output is high for one monitoring cycle.

OBDII Code B2502 GMC - Park Relay Shorted To Ground - AutoCodes.com — B2502 GMC Code - Park Relay Shorted To Ground

What does this mean?

What are the Possible Causes of the DTC B2502 GMC?

Faulty Park Relay
Park Relay harness is open or shorted
Park Relay circuit poor electrical connection
Faulty Platform Zone Module (PZM)

How to Fix the DTC B2502 GMC?

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 B2502 GMC 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 B2502 GMC Code

1. What are the common symptoms of OBDII code B2502 GMC (Park Relay Shorted To Ground)?

- The common symptoms include the inability to shift out of Park, problems with the brake lights, and potential issues with starting the vehicle.

2. What are the possible causes of OBDII code B2502 GMC?

- The code B2502 GMC (Park Relay Shorted To Ground) is typically caused by a faulty park relay, damaged wiring, or a short circuit in the park relay circuit.

3. How can I diagnose OBDII code B2502 GMC?

- To diagnose this code, you can use a diagnostic scanner to read the code and perform a visual inspection of the park relay and wiring for any visible damage or corrosion.

4. Can I still drive my vehicle with OBDII code B2502 GMC?

- It is not recommended to drive the vehicle if you are experiencing symptoms related to this code, as it can lead to safety hazards and further damage to the vehicle.

5. How do I repair OBDII code B2502 GMC?

- The repair process typically involves replacing the faulty park relay, repairing any damaged wiring, and clearing the error code with a diagnostic scanner.

6. Is it possible to reset OBDII code B2502 GMC without repairs?

- While you can clear the error code temporarily with a diagnostic scanner, it is important to address the underlying issue to prevent the code from reoccurring.

7. Can a DIY enthusiast fix OBDII code B2502 GMC at home?

- Depending on your skill level and access to tools, you may be able to replace the park relay or repair wiring issues at home. However, professional assistance is recommended for more complex repairs.

8. How much does it cost to fix OBDII code B2502 GMC at a repair shop?

- The cost of fixing this code at a repair shop can vary depending on the extent of the damage and the rates of the service provider. It is advisable to obtain quotes from multiple shops for comparison.

9. Are there any preventive measures to avoid OBDII code B2502 GMC in the future?

- To prevent this code from reoccurring, regularly inspect and maintain the park relay and wiring connections in your vehicle, and address any issues promptly.

10. Can OBDII code B2502 GMC affect other systems in my vehicle?

- While this code specifically relates to the park relay, electrical issues in the vehicle can sometimes have secondary effects on other systems. It is important to address the issue promptly to prevent further complications.