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P1603 Jeep Code - PCM Internal Dual-Port Communication 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
P1603 Jeep indicates PCM Internal Dual-Port Communication 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 24,043
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Sep 30, 2020
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Code P1603 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 P1603 Jeep - PCM Internal Dual-Port Communication Failure - AutoCodes.com
P1603 Jeep Code - PCM Internal Dual-Port Communication Failure
What does this mean?

What are the Possible Causes of the DTC P1603 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 P1603 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





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1603 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 P1603 Jeep Code

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