AutoCodes – RAM – P1604 RAM

P1604 RAM 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 RAM 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 1,165

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 Sep 30, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1604 RAM 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 RAM - PCM Internal Dual-Port RAM Read/Write Integrity Failure - AutoCodes.com — P1604 RAM Code - PCM Internal Dual-Port RAM Read/Write Integrity Failure

What does this mean?

What are the Possible Causes of the DTC P1604 RAM?

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 RAM?

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 P1604 RAM 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 RAM Code

1. What are the common symptoms of OBDII code P1604 RAM?

The common symptoms of OBDII code P1604 RAM include rough idling, engine misfires, reduced fuel efficiency, and potential stalling of the vehicle.

2. What are the possible causes of OBDII code P1604 RAM?

Possible causes of OBDII code P1604 RAM include a faulty PCM (Powertrain Control Module), damaged wiring or connectors in the PCM circuit, or issues with the internal dual-port RAM within the PCM.

3. How can I diagnose OBDII code P1604 RAM?

Diagnosing OBDII code P1604 RAM typically involves using a diagnostic scanner to retrieve the trouble codes, conducting a visual inspection of the PCM and related components, and performing tests on the PCM's internal RAM integrity.

4. What are some repair tips for addressing OBDII code P1604 RAM?

Repair tips for OBDII code P1604 RAM may include checking and repairing any damaged wiring or connectors, resetting the PCM, or replacing the PCM if the internal dual-port RAM integrity is compromised.

5. Can OBDII code P1604 RAM be fixed at home, or do I need professional help?

The complexity of fixing OBDII code P1604 RAM varies depending on the underlying cause. While some simple fixes like resetting the PCM can be done at home, diagnosing and repairing internal PCM issues may require professional help.

6. Is it safe to continue driving with OBDII code P1604 RAM present?

It is not recommended to continue driving with OBDII code P1604 RAM present, as it can lead to further damage to the vehicle's engine and systems. It is best to address the issue promptly to prevent any potential safety hazards.

7. How much does it typically cost to repair OBDII code P1604 RAM?

The cost of repairing OBDII code P1604 RAM can vary depending on the specific cause of the issue and whether professional diagnostic and repair services are needed. Costs may range from a simple reset procedure to a more involved PCM replacement.

8. Can a low car battery trigger OBDII code P1604 RAM?

A low car battery can potentially trigger OBDII code P1604 RAM if it causes voltage fluctuations that affect the PCM's operations. Ensuring the car battery is in good condition is important for overall vehicle health.

9. How long does it take to repair OBDII code P1604 RAM?

The time needed to repair OBDII code P1604 RAM can vary based on the specific cause of the issue and the complexity of the repair. Simple fixes may take a short amount of time, while more involved repairs could require a longer duration.

10. Is it possible for OBDII code P1604 RAM to reappear after repair?

OBDII code P1604 RAM can reappear if the underlying issue is not fully addressed during the repair process. It's essential to follow proper diagnostic procedures and ensure all related components are functioning correctly to prevent the code from reoccurring.