AutoCodes – Generic – P1DDE

P1DDE 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 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 4,013

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

What does this mean?

What are the Possible Causes of the DTC P1DDE?

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?

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 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.

Need more information about the P1DDE code?

Need more information on how to fix the P1DDE code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1DDE code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1DDE Chrysler — Ignition Run-Start Input 1-2 Correlation
P1DDE Dodge — Ignition Run-Start Input 1-2 Correlation
P1DDE Fiat — Ignition Run-Start Input 1-2 Correlation
P1DDE Jeep — Ignition Run-Start Input 1-2 Correlation

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 Code

1. What are common symptoms of OBDII code P1DDE (Ignition Run-Start Input 1-2 Correlation)?

- Common symptoms include engine misfires, rough idling, stalling, and difficulty starting the vehicle.

2. What causes OBDII code P1DDE to appear?

- This code is typically triggered by issues with the correlation between the ignition run-start input signals 1 and 2, which can be caused by faulty sensors or wiring.

3. How can I diagnose the cause of OBDII code P1DDE?

- Diagnosing this code often involves checking the integrity of the ignition run-start input sensors, inspecting the wiring harness for damage, and performing a thorough scan of the vehicle's electrical system.

4. Can a bad battery cause OBDII code P1DDE to trigger?

- Yes, a weak or failing battery can sometimes lead to issues with the ignition run-start input signals, potentially triggering code P1DDE.

5. What are the repair options for OBDII code P1DDE?

- Repair options may include replacing faulty sensors, repairing damaged wiring, addressing any underlying electrical issues, and ensuring proper connection of the ignition run-start input components.

6. Is it safe to continue driving with OBDII code P1DDE present?

- It is not recommended to continue driving with this code active, as it can lead to poor engine performance, potential stalling, and other safety concerns.

7. Can a DIY enthusiast fix OBDII code P1DDE at home?

- Depending on the specific cause of the code, some DIY enthusiasts may be able to address the issue by replacing sensors or repairing wiring themselves, but complex electrical diagnostics may require professional assistance.

8. Will resetting the OBDII system clear the P1DDE code?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.

9. How do I prevent OBDII code P1DDE from recurring?

- To prevent the code from recurring, it's essential to address the root cause of the issue, perform regular maintenance on the vehicle's electrical system, and address any related problems promptly.

10. Can extreme weather conditions affect the ignition run-start input signals and trigger OBDII code P1DDE?

- Extreme weather conditions, such as extreme heat or cold, can sometimes impact the performance of sensors and wiring related to the ignition system, potentially leading to the triggering of code P1DDE.