AutoCodes – Cadillac – B2503 Cadillac

B2503 Cadillac Code - Park Relay Shorted To Battery

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: B2503 Cadillac indicates Park Relay Shorted To Battery.
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 499

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 B2503 Cadillac 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) B2503 will set when park relay output is active and PZM determines output is high for 2 consecutive monitoring cycles. DTC B2503 will clear when park relay output is active and PZM determines output is low for 2 monitoring cycles.

OBDII Code B2503 Cadillac - Park Relay Shorted To Battery - AutoCodes.com — B2503 Cadillac Code - Park Relay Shorted To Battery

What does this mean?

What are the Possible Causes of the DTC B2503 Cadillac?

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 B2503 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 B2503 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 B2503 Cadillac code?

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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 B2503 Cadillac Code

What does the OBDII code B2503 mean for a Cadillac?

The B2503 code indicates a problem with the park relay, specifically that it is shorted to the battery, which can affect the vehicle's ability to engage or disengage certain electrical functions.

What symptoms might I experience with a B2503 code?

Common symptoms include issues with the vehicle's parking lights, malfunctioning gear selector indicators, or problems with the starting system.

What could cause the B2503 code to trigger?

Possible causes include a faulty park relay, wiring issues such as shorts or open circuits, or problems with the body control module.

How can I diagnose the B2503 code?

Start by visually inspecting the park relay and associated wiring for damage or corrosion. Use a multimeter to check for voltage and continuity in the circuit.

What are some common repair tips for fixing the B2503 code?

Replace the faulty park relay, repair any damaged wiring, and ensure all connections are clean and secure. You may also need to reset the vehicle's computer after repairs.

Can I drive my Cadillac with a B2503 code?

While it might be possible to drive the vehicle, it is not recommended, as the issue could lead to further electrical problems or safety concerns.

Will clearing the B2503 code fix the problem?

Clearing the code may temporarily remove the warning, but it does not fix the underlying issue. Proper diagnostics and repairs are necessary to resolve the problem.

How much will it cost to repair the B2503 code?

Repair costs can vary widely depending on the specific issue, but replacing a park relay is typically a low-cost repair, while extensive wiring repairs could be more expensive.

Is the B2503 code specific to Cadillac models?

While the code B2503 may appear in various makes and models, the specifics of the issue and how it affects each vehicle can vary, with Cadillac vehicles having their own unique systems.