AutoCodes – Generic – P2502

P2502 Code - Charging System Voltage

Quick Answer

The Powertrain Control Module (PCM) monitors the charging system for changes in the output voltage. Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator 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: P2502 indicates Charging System Voltage.
Common causes: Common causes include Faulty Generator (Alternator), Generator harness is open or shorted, Generator 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 30,370

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 Jan 15, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2502 Description

The Powertrain Control Module (PCM) monitors the charging system for changes in the output voltage. The PCM set the OBDII P0502 code when the output voltage is out of factory specifications.

OBDII Code P2502 - Charging System Voltage - AutoCodes.com — P2502 Code - Charging System Voltage

What does this mean?

What are the Possible Causes of the DTC P2502?

Faulty Generator (Alternator)
Generator harness is open or shorted
Generator circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P2502?

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 P2502 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 P2502 code?

Need more information on how to fix the P2502 code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific Makes

P2502 Chrysler — Charging System Voltage
P2502 Dodge — Charging System Voltage
P2502 Jeep — Charging System Voltage

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.