AutoCodes – Jeep – P1604 Jeep

P1604 Jeep Code - PCM Internal Dual-Port RAM Read/Write Integrity Failure

Quick Answer

With the ignition off, on, and run/start the Powertrain Control Module (PCM) monitors the communication with the Ignition Switch Output circuit. Common causes include Powertrain Control Module (PCM) fused ignition switch circuit, Faulty PCM, PCM 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: P1604 Jeep indicates PCM Internal Dual-Port RAM Read/Write Integrity Failure.
Common causes: Common causes include Powertrain Control Module (PCM) fused ignition switch circuit, Faulty PCM, PCM 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 17,103

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 30, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P1604 Jeep Description

With the ignition off, on, and run/start the Powertrain Control Module (PCM) monitors the communication with the Ignition Switch Output circuit. The Diagnostic Trouble Code (DTC) will set when the PCM detects an intermittent open circuit between the PCM connector and the Fused Ignition Switch Output circuit.

OBDII Code P1604 Jeep - PCM Internal Dual-Port RAM Read/Write Integrity Failure - AutoCodes.com — P1604 Jeep Code - PCM Internal Dual-Port RAM Read/Write Integrity Failure

What does this mean?

What are the Possible Causes of the DTC P1604 Jeep?

Powertrain Control Module (PCM) fused ignition switch circuit
Faulty PCM
PCM harness is open or shorted
PCM circuit poor electrical connection

How to Fix the DTC P1604 Jeep?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1604 Jeep 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 P1604 Jeep Code

1. What are the common symptoms of OBDII code P1604 in a Jeep?

- Common symptoms of P1604 include engine performance issues, such as rough idle, stalling, or lack of power. The check engine light may also illuminate on the dashboard.

2. What does the OBDII code P1604 Jeep indicate?

- P1604 indicates a PCM Internal Dual-Port RAM Read/Write Integrity Failure in the Jeep's onboard diagnostics system.

3. What are the possible causes of OBDII code P1604 in a Jeep?

- The code P1604 in a Jeep can be caused by a faulty PCM, wiring issues, or a malfunction in the internal dual-port RAM system.

4. How can I diagnose the OBDII code P1604 in my Jeep?

- Diagnosing P1604 typically involves using a diagnostic scanner to retrieve the trouble code and then inspecting the PCM and related wiring for any visible damage or issues.

5. What are the repair options for OBDII code P1604 in a Jeep?

- Repair options for P1604 may include replacing the PCM, repairing any damaged wiring, or addressing any internal RAM system failures within the PCM.

6. Can I drive my Jeep with the OBDII code P1604 present?

- It is not recommended to drive your Jeep with the P1604 code present, as it can lead to further engine performance issues and potential damage. It is best to address the problem promptly.

7. How much does it typically cost to repair OBDII code P1604 in a Jeep?

- The cost of repairing P1604 can vary depending on the exact cause of the issue and the necessary repairs. It is advised to consult with a mechanic for an accurate cost estimate.

8. Are there any preventative maintenance tips to avoid OBDII code P1604 in a Jeep?

- Regularly scheduled maintenance, such as checking and maintaining the PCM and wiring connections, can help prevent issues that may trigger the P1604 code in a Jeep.

9. Can a DIY enthusiast fix OBDII code P1604 in a Jeep?

- While some DIY enthusiasts may be able to diagnose and address simple causes of P1604, it is recommended to seek professional help for more complex issues to ensure proper repair and safety.

10. How long does it take to repair OBDII code P1604 in a Jeep?

- The repair time for P1604 can vary depending on the extent of the issue and the availability of parts. It is best to consult with a mechanic for an accurate estimate of the repair time.