AutoCodes – Smart – P0903 Smart-car

P0903 Smart-car Code - Clutch Actuator Circuit High

Quick Answer

The clutch actuator is operated by the Transmission Control Module (TCM) and engages and disengages the clutch by the clutch master cylinder movement of the clutch actuator. Common causes include Faulty Clutch Actuator, Clutch Actuator harness is open or shorted, Clutch Actuator 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: P0903 Smart-car indicates Clutch Actuator Circuit High.
Common causes: Common causes include Faulty Clutch Actuator, Clutch Actuator harness is open or shorted, Clutch Actuator 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 1,398

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 May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0903 Smart-car Description

The clutch actuator is operated by the Transmission Control Module (TCM) and engages and disengages the clutch by the clutch master cylinder movement of the clutch actuator. An electric motor moves the clutch master cylinder, and the clutch stroke sensor, which is mounted on the clutch actuator assembly, detects the clutch master cylinder position. The TCM monitors the electrical current and clutch motor output terminal voltage, and detects malfunctions in the clutch motor circuit.

OBDII Code P0903 Smart-car - Clutch Actuator Circuit High - AutoCodes.com — P0903 Smart-car Code - Clutch Actuator Circuit High

What does this mean?

What are the Possible Causes of the DTC P0903 Smart-car?

Faulty Clutch Actuator
Clutch Actuator harness is open or shorted
Clutch Actuator circuit poor electrical connection

How to Fix the DTC P0903 Smart-car?

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 P0903 Smart-car 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 P0903 Smart-car code?

Need more information on how to fix the P0903 Smart-car code? Get Access to Factory Service Manuals

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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 P0903 Smart-car Code

1. What does the OBDII code P0903 mean on a Smart car?

The P0903 code indicates a "Clutch Actuator Circuit High," meaning the vehicle's computer has detected an issue with the electrical circuit of the clutch actuator, such as high voltage.

2. What are the common symptoms of a P0903 code?

Common symptoms include difficulty shifting gears, the transmission stuck in one gear, a lack of response when accelerating, and the check engine light being illuminated.

3. What causes the P0903 code to appear in a Smart car?

Possible causes include a faulty clutch actuator, damaged wiring or connectors, a malfunctioning transmission control module (TCM), or electrical problems like a short circuit or high resistance.

4. Can I still drive my Smart car with a P0903 code?

While you may be able to drive, it is not recommended. The vehicle may experience shifting issues or become stuck in gear, which could lead to unsafe driving conditions or further damage.

5. How do I diagnose the P0903 code on my Smart car?

Start by inspecting the clutch actuator and its wiring for damage or loose connections. Use a multimeter to check for proper voltage, and scan the TCM for additional codes to narrow down the issue.

6. How do I fix a P0903 code on a Smart car?

Repairs may involve replacing the clutch actuator, repairing or replacing damaged wiring or connectors, updating or reprogramming the TCM, or addressing any electrical faults in the circuit.

7. How much does it cost to repair a P0903 code?

Repair costs vary depending on the cause but typically range from $200 to $600, including parts and labor. Replacing the clutch actuator is usually the most expensive repair.

8. Can a weak battery cause the P0903 code?

Yes, a weak or failing battery can cause voltage issues, potentially triggering the P0903 code. Ensure your battery is in good condition before diagnosing further.

9. Will clearing the code fix the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.

10. Can a P0903 code damage my transmission?

If left unresolved, the P0903 code can cause improper shifting and increased wear on the transmission, potentially leading to more expensive repairs over time.