AutoCodes – Chrysler – P1594 Chrysler

P1594 Chrysler Code - Charging System Voltage Too High

Quick Answer

When the Powertrain Control Module (PCM) regulates the generator field and the there are no detected field problems but the voltage output does not decrease, the P594 code will set. Common causes include Faulty Ambient/Battery temperature sensor, Faulty Alternator, Alternator harness is open or shorted. 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: P1594 Chrysler indicates Charging System Voltage Too High.
Common causes: Common causes include Faulty Ambient/Battery temperature sensor, Faulty Alternator, Alternator harness is open or shorted.
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 7,224

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 May 20, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1594 Chrysler Description

When the Powertrain Control Module (PCM) regulates the generator field and the there are no detected field problems but the voltage output does not decrease, the P594 code will set.

OBDII Code P1594 Chrysler - Charging System Voltage Too High - AutoCodes.com — P1594 Chrysler Code - Charging System Voltage Too High

What does this mean?

What are the Possible Causes of the DTC P1594 Chrysler?

Faulty Ambient/Battery temperature sensor
Faulty Alternator
Alternator harness is open or shorted
Alternator electrical circuit poor electrical connection

How to Fix the DTC P1594 Chrysler?

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 P1594 Chrysler 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.