AutoCodes – Fiat – C2502 Fiat

C2502 Fiat 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 Fiat 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 3,543

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

What does this mean?

What are the Possible Causes of the DTC C2502 Fiat?

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 Fiat?

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 Fiat 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 Fiat code?

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

Need Help with the Code?

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

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 Fiat Code

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

- Common symptoms include erratic shifting behavior, transmission slippage, and illuminated warning lights on the dashboard.

2. What can cause the OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- This code is commonly triggered by issues such as faulty transmission control module (TCM), damaged wiring, or a poor connection in the TCM circuit.

3. How can I diagnose the OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- Diagnosis typically involves using a scan tool to retrieve the trouble codes, inspecting the TCM and related wiring for any visible damage, and conducting a thorough system check.

4. What are the repair options for OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- Repairs may involve replacing the TCM, repairing or replacing damaged wiring, ensuring proper connections, and clearing the trouble codes to reset the system.

5. Can I drive my vehicle with the OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- It is not recommended to drive the vehicle with this code present, as it can lead to further transmission issues and potential safety hazards.

6. How serious is the OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- This code indicates a problem with the transmission control system, which can affect the vehicle's performance and drivability if not addressed promptly.

7. Can a DIY enthusiast fix the OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- While some basic diagnostics and repairs can be attempted by DIY enthusiasts, dealing with transmission control issues may require specialized knowledge and tools best handled by a professional mechanic.

8. How much does it cost to repair the OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- Repair costs can vary depending on the underlying cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

9. Are there any preventive measures to avoid OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- Regular maintenance, including checking for loose or damaged wiring, ensuring proper connection integrity, and addressing any warning signs promptly, can help prevent this code from occurring.

10. How long does it take to repair the OBDII code C2502 Fiat DTCM Signal Plausibility Failure?

- The repair time can vary based on the specific issue causing the code, but it typically takes a few hours to a day for a professional mechanic to diagnose and fix the problem.