AutoCodes – Generic – P1D25

P1D25 Code - Shift Control Rationality

Quick Answer

The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. 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: P1D25 indicates Shift Control Rationality.
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 1,680

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 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1D25 Description

The Transmission Control Module (TCM) performs various internal tests to verify proper controller operation. If the TCM detects that the variables that dictate the vehicle application are not present, the controller will enter Limp-in mode and illuminate the MIL.

OBDII Code P1D25 - Shift Control Rationality - AutoCodes.com — P1D25 Code - Shift Control Rationality

What does this mean?

What are the Possible Causes of the DTC P1D25?

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 P1D25?

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 P1D25 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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Information for Specific Makes

P1D25 Jeep — Shift Control Rationality

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 P1D25 Code

1. What does the OBDII code P1D25 mean?

P1D25 indicates a problem related to the shift control logic in the transmission, where the system detects an issue with the rationality of gear shifting.

2. What are the common symptoms of the P1D25 code?

Symptoms include erratic shifting, difficulty changing gears, the transmission staying in one gear, and an illuminated check engine light.

3. What causes the P1D25 code?

Common causes include faulty transmission solenoids, low or degraded transmission fluid, damaged wiring, a malfunctioning transmission control module (TCM), or internal transmission issues.

4. Can low transmission fluid trigger the P1D25 code?

Yes, low or contaminated transmission fluid can affect shift control and cause the P1D25 code.

5. How is the P1D25 code diagnosed?

A mechanic will use a scan tool to read the code, check transmission fluid levels and condition, inspect wiring and connectors, and test transmission solenoids and the TCM.

6. Can I drive with the P1D25 code?

Driving is possible but not recommended, as it may lead to further transmission damage and potentially unsafe driving conditions.

7. How do I fix the P1D25 code?

Repairs may include replacing or repairing transmission solenoids, cleaning or refilling transmission fluid, fixing damaged wiring, or replacing the TCM if necessary.

8. How much does it cost to fix the P1D25 code?

Costs vary widely, ranging from $100 for fluid service to over $1,000 if major transmission components or the TCM need replacement.

9. Can a software update fix the P1D25 code?

In some cases, a TCM software update from the manufacturer may resolve the issue if the problem is related to programming.

10. Will clearing the P1D25 code with a scanner fix the issue?

Clearing the code may turn off the check engine light temporarily, but it wonâ€™t resolve the underlying issue causing the code. Proper diagnosis and repair are needed.