AutoCodes – Jeep – P1DDE Jeep

P1DDE Jeep Code - Ignition Run-Start Input 1-2 Correlation

Quick Answer

The purpose of the diagnostic is to monitor if the hard-wired ignition signal state is equal to the ignition signal state received on the Controller Area Network (CAN) BUS. Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) circuit poor electrical connection. 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: P1DDE Jeep indicates Ignition Run-Start Input 1-2 Correlation.
Common causes: Common causes include Faulty Transmission Control Module (TCM), Transmission Control Module (TCM) harness is open or shorted, Transmission Control Module (TCM) circuit poor electrical connection.
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 6,324

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 Apr 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1DDE Jeep Description

The purpose of the diagnostic is to monitor if the hard-wired ignition signal state is equal to the ignition signal state received on the Controller Area Network (CAN) BUS. The CAN message is sent by the Body Control Module (BCM) to the Transmission Control Module (TCM).

OBDII Code P1DDE Jeep - Ignition Run-Start Input 1-2 Correlation - AutoCodes.com — P1DDE Jeep Code - Ignition Run-Start Input 1-2 Correlation

What does this mean?

What are the Possible Causes of the DTC P1DDE Jeep?

Faulty Transmission Control Module (TCM)
Transmission Control Module (TCM) harness is open or shorted
Transmission Control Module (TCM) circuit poor electrical connection

How to Fix the DTC P1DDE 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1DDE 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 P1DDE Jeep Code

1. What is OBDII code P1DDE in a Jeep and what does it indicate?

Code P1DDE in a Jeep refers to the Ignition Run-Start Input 1-2 Correlation error. It means there is a discrepancy between the signals received by the ignition system during startup.

2. What are the common symptoms of OBDII code P1DDE in a Jeep?

Common symptoms of code P1DDE may include difficulty starting the vehicle, stalling or rough idling, and potentially even engine misfires.

3. What are the possible causes of OBDII code P1DDE in a Jeep?

Potential causes of code P1DDE in a Jeep include issues with the ignition switch, faulty wiring or connectors in the ignition system, or a malfunctioning Engine Control Module (ECM).

4. How can I diagnose OBDII code P1DDE in my Jeep?

Diagnosing code P1DDE typically involves using a scan tool to retrieve the code and checking the ignition system components, wiring, and connections for any visible damage or faults.

5. Can I still drive my Jeep with OBDII code P1DDE present?

It is not recommended to drive your Jeep with unresolved code P1DDE, as it can lead to potential starting or performance issues that may worsen over time.

6. How can I repair OBDII code P1DDE in my Jeep?

Repairing code P1DDE may involve replacing the ignition switch, repairing or replacing damaged wiring or connectors, or reprogramming the ECM to resolve the correlation error.

7. Are there any DIY tips for addressing OBDII code P1DDE in a Jeep?

While some basic inspections and checks can be done at home, diagnosing and repairing code P1DDE may require specialized tools and expertise, so it's recommended to consult a professional mechanic.

8. How much does it typically cost to fix OBDII code P1DDE in a Jeep?

The cost of repairing code P1DDE in a Jeep can vary depending on the exact cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

9. Can a faulty ignition system cause OBDII code P1DDE in a Jeep?

Yes, a faulty ignition system, particularly issues with the ignition switch or related components, can trigger code P1DDE in a Jeep due to the correlation error detected during startup.

10. Is it important to address OBDII code P1DDE promptly in my Jeep?

Yes, addressing code P1DDE promptly is crucial to prevent potential starting problems, engine performance issues, or further damage to the ignition system in your Jeep.