AutoCodes – Generic – C2502

C2502 Code - DTCM Signal Plausibility Failure

Quick Answer

Any time the key is on and the engine has been running for at least 4 seconds the Drivetrain Control Module (DTCM) continuously runs a diagnostic check on the Transmission Control Module (TCM), Anti-lock Brake System (ABS) Module, Electric Power Steering (EPS) Module and the Powertrain Control Module (PCM) to ensure that the Modules can honor any Terrain Selector Switch request. Common causes include Faulty Anti-Lock Brake System (ABS) Module, Faulty Electric Power Steering (EPS) Module, Faulty Powertrain Control Module (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: C2502 indicates DTCM Signal Plausibility Failure.
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Module, Faulty Electric Power Steering (EPS) Module, Faulty Powertrain Control Module (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.

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Code Popularity 3,910

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2502 Description

Any time the key is on and the engine has been running for at least 4 seconds the Drivetrain Control Module (DTCM) continuously runs a diagnostic check on the Transmission Control Module (TCM), Anti-lock Brake System (ABS) Module, Electric Power Steering (EPS) Module and the Powertrain Control Module (PCM) to ensure that the Modules can honor any Terrain Selector Switch request. If the DTCM receives a message from one of these other modules indicating that they have had a failure, the DTCM forces the terrain selector switch into AUTO mode and will disable the terrain selection option to the customer. This DTC is set in the DTCM to inform the Technician that the AWD system is working properly but the driving mode can not be selected because another system in the vehicle has failed.

OBDII Code C2502 - DTCM Signal Plausibility Failure - AutoCodes.com — C2502 Code - DTCM Signal Plausibility Failure

What does this mean?

What are the Possible Causes of the DTC C2502?

Faulty Anti-Lock Brake System (ABS) Module
Faulty Electric Power Steering (EPS) Module
Faulty Powertrain Control Module (PCM)
Faulty Transmission Control Module (TCM)

How to Fix the DTC C2502?

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 C2502 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 C2502 code?

Need more information on how to fix the C2502 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2502 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C2502 Chrysler — DTCM Signal Plausibility Failure
C2502 Dodge — DTCM Signal Plausibility Failure
C2502 Fiat — DTCM Signal Plausibility Failure
C2502 Jeep — DTCM Signal Plausibility Failure
C2502 RAM — DTCM Signal Plausibility Failure

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 C2502 Code

1. What are the common symptoms of OBDII code C2502 (DTCM Signal Plausibility Failure)?

The common symptoms of code C2502 include erratic shifting, transmission slipping, and illuminated warning lights on the dashboard.

2. What can cause the OBDII code C2502 to be triggered?

The DTCM Signal Plausibility Failure (C2502) can be triggered by issues such as faulty wiring, a malfunctioning transmission control module, or sensor problems.

3. How serious is the DTCM Signal Plausibility Failure (C2502) code?

Code C2502 can lead to drivability issues and potential transmission damage if left unresolved. It is important to address this issue promptly to avoid further damage.

4. What should I do if my vehicle shows the OBDII code C2502?

If your vehicle displays code C2502, it is recommended to have a professional mechanic diagnose the issue to determine the exact cause and necessary repairs.

5. Can I continue driving my vehicle with the DTCM Signal Plausibility Failure (C2502) code?

It is not advisable to continue driving your vehicle with code C2502 present, as it can lead to further transmission problems and potentially unsafe driving conditions.

6. How can I repair OBDII code C2502?

Repairing code C2502 may involve fixing wiring issues, replacing the transmission control module, or addressing sensor malfunctions. A professional mechanic can provide the most effective repair solution.

7. Is it possible to reset the OBDII code C2502 without repairs?

Resetting the code without addressing the underlying issue will likely result in the code reappearing. It is essential to diagnose and repair the root cause of code C2502.

8. How much does it typically cost to repair OBDII code C2502?

The cost of repairing code C2502 can vary depending on the specific cause of the issue, parts needed, and labor costs. It is recommended to obtain a repair estimate from a qualified mechanic.

9. Can a DIY enthusiast fix the DTCM Signal Plausibility Failure (C2502) code?

Due to the complexity of transmission control systems, it is generally best to have a professional mechanic diagnose and repair code C2502 to ensure the issue is properly resolved.

10. Are there any preventive measures to avoid OBDII code C2502 in the future?

Regular maintenance, such as checking and replacing transmission fluid as recommended by the manufacturer, can help prevent issues that may trigger code C2502.