AutoCodes – Generic – P186D

P186D Code - High Side 1 System Voltage Low Range Out

Quick Answer

The Twin Clutch Sportronic Shift Transmission (TC-SST) Electronic Control Unit (ECU) monitors the system and the voltage of the high side 1 circuit is determined to be too low. Common causes include Faulty Twin Clutch Sportronic Shift Transmission (TC-SST) Electronic Control Unit (ECU), TC-SST-ECU harness is open or shorted, TC-SST-ECU 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: P186D indicates High Side 1 System Voltage Low Range Out.
Common causes: Common causes include Faulty Twin Clutch Sportronic Shift Transmission (TC-SST) Electronic Control Unit (ECU), TC-SST-ECU harness is open or shorted, TC-SST-ECU 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 2,376

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 Jan 31, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P186D Description

The Twin Clutch Sportronic Shift Transmission (TC-SST) Electronic Control Unit (ECU) monitors the system and the voltage of the high side 1 circuit is determined to be too low.

OBDII Code P186D - High Side 1 System Voltage Low Range Out - AutoCodes.com — P186D Code - High Side 1 System Voltage Low Range Out

What does this mean?

What are the Possible Causes of the DTC P186D?

Faulty Twin Clutch Sportronic Shift Transmission (TC-SST) Electronic Control Unit (ECU)
TC-SST-ECU harness is open or shorted
TC-SST-ECU circuit poor electrical connection

How to Fix the DTC P186D?

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 P186D 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 P186D code?

Need more information on how to fix the P186D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P186D code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P186D Mitsubishi — High Side 1 System Voltage Low Range Out

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 P186D Code

1. What are the common symptoms of OBDII code P186D (High Side 1 System Voltage Low Range Out)?

- Common symptoms of this code may include poor vehicle performance, rough idling, decreased fuel efficiency, and possible stalling.

2. What are the possible causes of OBDII code P186D?

- The code P186D may be triggered by issues such as a faulty high-side driver circuit, wiring problems, a defective powertrain control module (PCM), or issues with the high-side driver circuit components.

3. How can I diagnose the OBDII code P186D?

- Diagnosis involves using an OBDII scanner to retrieve the code, checking for any other related codes, inspecting the high-side driver circuit components, and testing the wiring for continuity and proper voltage.

4. Can I still drive my vehicle with OBDII code P186D present?

- It is not recommended to drive your vehicle with the P186D code present, as it can lead to further damage and potential safety hazards. It's best to address the issue promptly.

5. How can I repair OBDII code P186D (High Side 1 System Voltage Low Range Out)?

- Repairing this code may involve replacing the faulty high-side driver circuit components, repairing any damaged wiring, or replacing the PCM if necessary. It's recommended to consult a professional mechanic for proper diagnosis and repair.

6. Is it safe to reset the OBDII code P186D without fixing the underlying issue?

- While you can reset the code temporarily, it is not advisable to do so without addressing the root cause. Ignoring the underlying problem may lead to further damage and potential safety risks.

7. Can a DIY enthusiast fix OBDII code P186D at home?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the issues related to P186D. However, due to the complexity of the high-side driver circuit and wiring, it's recommended to seek professional help for accurate diagnosis and repair.

8. What are the long-term effects of ignoring OBDII code P186D?

- Ignoring the P186D code can lead to more severe engine problems, decreased fuel efficiency, and potential safety hazards. It's crucial to address this issue promptly to prevent further damage.

9. Is OBDII code P186D a common issue in certain vehicle models?

- The occurrence of the P186D code can vary across different vehicle makes and models. However, it may be more prevalent in vehicles with high-side driver circuitry or PCM issues.

10. How much can I expect to pay for repairing OBDII code P186D at a mechanic's shop?

- The cost of repairing the P186D code can vary depending on the extent of the issue, the specific repairs needed, and the labor rates of the mechanic. It's advisable to obtain quotes from different shops for a more accurate estimate.