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P1603 Chrysler Code - PCM Internal Dual-Port Communication Failure

Quick Answer

The P1603 Chrysler code indicates a PCM (Powertrain Control Module) Internal Dual-Port Communication Failure. Common causes include Damaged wiring or connectors, Corrosion on electrical connections, Internal component failure within the PCM. 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
P1603 Chrysler indicates PCM Internal Dual-Port Communication Failure.
Common causes
Common causes include Damaged wiring or connectors, Corrosion on electrical connections, Internal component failure within the PCM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P1603 Chrysler Description

The P1603 Chrysler code indicates a PCM (Powertrain Control Module) Internal Dual-Port Communication Failure. The PCM is a crucial component of the vehicle's onboard computer system, responsible for controlling various functions such as engine performance, emissions, and transmission. The dual-port communication failure refers to a breakdown in the communication between two different communication ports within the PCM.

OBDII Code P1603 Chrysler - PCM Internal Dual-Port Communication Failure
P1603 Chrysler Code - PCM Internal Dual-Port Communication Failure

Common Causes of P1603 Chrysler

  1. Damaged wiring or connectors
  2. Corrosion on electrical connections
  3. Internal component failure within the PCM
  4. Overloading of the communication ports
  5. Electrical interference from other components

Symptoms of P1603 Chrysler

  1. Engine misfires
  2. Rough idling
  3. Poor fuel efficiency
  4. Stalling or difficulty starting

How to Fix P1603 Chrysler

  1. Diagnose the issue using a scan tool to identify the specific cause of the communication failure.
  2. Inspect wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
  3. Check for proper grounding and clean connections to ensure proper communication.
  4. Reset the PCM and clear the code to see if the issue resolves.
  5. If the problem persists, consider replacing the PCM with a new unit.

Cost to Fix P1603 Chrysler

The typical repair costs for addressing a PCM Internal Dual-Port Communication Failure can vary depending on the extent of the damage and the specific components that need to be replaced. In general, replacing a PCM can range from $500 to $1500, including parts and labor. However, it's essential to note that labor rates at auto repair shops can vary, so it's advisable to check local rates for a more accurate estimate based on your location and vehicle model.

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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 P1603 Chrysler Code

1. What are the common symptoms of OBDII code P1603 Chrysler (PCM Internal Dual-Port Communication Failure)?

The common symptoms include issues with engine performance, stalling, rough idling, and illuminated Check Engine light.

2. What can cause the OBDII code P1603 Chrysler to trigger?

The code P1603 Chrysler is typically triggered by internal communication failures within the Powertrain Control Module (PCM) of the vehicle.

3. How serious is the OBDII code P1603 Chrysler (PCM Internal Dual-Port Communication Failure)?

While the code itself may not cause immediate harm to the vehicle, it can lead to performance issues and should be addressed promptly to prevent further complications.

4. Can a DIY enthusiast repair OBDII code P1603 Chrysler?

Repairing the PCM Internal Dual-Port Communication Failure (P1603) may require advanced diagnostic tools and technical expertise, making it more suitable for professional repair.

5. What are some possible repair tips for fixing the OBDII code P1603 Chrysler?

Repair tips may include checking and repairing wiring connections, ensuring proper ground connections, and, if necessary, replacing the PCM with a new unit.

6. Is it safe to continue driving with the OBDII code P1603 Chrysler activated?

Continuing to drive with the code active may result in further damage to the vehicle's systems. It is recommended to address the issue as soon as possible to avoid potential complications.

7. How can a mechanic diagnose the OBDII code P1603 Chrysler?

A mechanic can diagnose the code by using a scan tool to retrieve the specific error codes, checking the PCM for internal communication issues, and performing a thorough inspection of related components.

8. Are there any common mistakes to avoid when dealing with the OBDII code P1603 Chrysler?

Common mistakes include overlooking simple wiring issues, failing to properly diagnose the PCM, and attempting repairs without the necessary tools and knowledge.

9. Can weather or environmental factors contribute to the activation of OBDII code P1603 Chrysler?

Extreme weather conditions or exposure to moisture can potentially impact the internal communication within the PCM, leading to the activation of the code.

10. How much can a repair for the OBDII code P1603 Chrysler cost?

The cost of repairing the code P1603 Chrysler can vary depending on the extent of the damage, the need for a PCM replacement, and labor costs. It is advisable to consult with a professional mechanic for an accurate estimate.

Discuss the causes and fixes for P1603 Chrysler OBDII Code

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  • I put two pcms in and both didn't work car started then died twice then wouldn't start put old one back in and car starts and runs but ck eng light cums on...if I take the battery cable off for 20 sec. you can drive the car for a thousand miles just don't turn it off cas the light will cum on and car will stay in second gear....it gives code p1603 p0700 u0101

    Reply to Comment

  • What model and year is your vehicle?

    Reply to Comment

  • 2005 sebring 2.7L 41te (A604) transmission.

    I have had the exact same issues as of late, with the exception of p0700. I have had u0101 intermittently and p1603 more frequently. Same issue though, can drive as far as gas will take you so long as you don't fully disengage ignition switch (leave key in ignition-accessory on position) during short stops less than 10-15 minutes. If you do, limp mode occurs and I have to either wait, or drive a little way and reset ignition connection a few times to get it to quit. I'm starting to lean towards clogged transmission solenoid at this point.. will update if I get any results from shift solenoid body rebuild. Have you had any more luck diagnosing this?

    Reply to Comment