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Engine-Codes – Generic – P317B

P317B Code - Traction Motor Inverter Relay Cut-Off Request

Quick Answer

The P317B diagnostic trouble code indicates that there is a malfunction in the traction motor inverter relay cut-off request system. Common causes include Faulty traction motor inverter relay, Wiring issues or loose connections in the inverter relay circuit, Malfunctioning sensors that monitor the inverter relay system. 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
P317B indicates Traction Motor Inverter Relay Cut-Off Request.
Common causes
Common causes include Faulty traction motor inverter relay, Wiring issues or loose connections in the inverter relay circuit, Malfunctioning sensors that monitor the inverter relay system.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P317B Description

The P317B diagnostic trouble code indicates that there is a malfunction in the traction motor inverter relay cut-off request system. In electric and hybrid vehicles, the traction motor inverter is responsible for converting direct current (DC) from the battery into alternating current (AC) to power the electric motor. The relay cut-off request system controls the operation of the inverter relay, which plays a crucial role in managing power flow to the electric motor.

OBDII Code P317B - Traction Motor Inverter Relay Cut-Off Request
P317B Code - Traction Motor Inverter Relay Cut-Off Request

Common Causes of P317B

  1. Faulty traction motor inverter relay
  2. Wiring issues or loose connections in the inverter relay circuit
  3. Malfunctioning sensors that monitor the inverter relay system
  4. Software or programming issues in the vehicle's control module
  5. Overheating or thermal damage to the traction motor inverter relay

Symptoms of P317B

  1. Loss of power or reduced acceleration
  2. Erratic behavior of the electric motor
  3. Inconsistent or jerky driving experience
  4. Warning lights on the dashboard, such as the check engine light
  5. Vehicle may go into limp mode to prevent further damage

How to Fix P317B

  1. Diagnose the issue by using a diagnostic scan tool to retrieve the trouble codes and inspecting the traction motor inverter relay system.
  2. Check the wiring and connections in the inverter relay circuit for any damage or loose connections.
  3. Test the traction motor inverter relay for proper functionality and replace if necessary.
  4. Clear the trouble codes from the vehicle's computer and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the malfunction.

Cost to Fix P317B

The cost of repairing the traction motor inverter relay cut-off request issue can vary depending on the specific cause of the problem and the extent of the repairs needed. In general, the cost of parts for replacing the traction motor inverter relay can range from $100 to $300. Labor costs for this repair can range from $100 to $300, depending on the shop's hourly rate and the complexity of the repair. Additional diagnostic testing or repairs may incur extra costs. It's advisable to consult with a professional mechanic or repair shop to get an accurate estimate based on your vehicle's make and model.

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Code P317B Information for Specific Makes

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 P317B Code

1. What does the OBDII code P317B mean?

P317B indicates that the traction motor inverter has detected a relay cut-off request, typically due to a fault in the hybrid or electric vehicle’s powertrain system.

2. What are the common symptoms of code P317B?

Common symptoms include reduced power or performance, illumination of the check engine light or hybrid system warning light, and limited functionality of the vehicle’s electric drive system.

3. What causes the P317B code to appear?

Possible causes include a malfunctioning traction motor inverter relay, wiring issues, a faulty inverter assembly, or software errors in the hybrid control system.

4. Can driving with code P317B damage my vehicle?

Yes, continuing to drive with this code may strain the hybrid or electric powertrain components and could lead to more severe damage.

5. How is code P317B diagnosed?

A technician will use a diagnostic scan tool to read the code, inspect the traction motor inverter relay and related wiring, and perform tests on the hybrid control system.

6. How do you fix the P317B code?

Repairs may involve replacing the traction motor inverter relay, repairing damaged wiring or connectors, reprogramming the hybrid control module, or, in rare cases, replacing the inverter.

7. Is the P317B code specific to hybrid or electric vehicles?

Yes, P317B is specific to hybrid or electric vehicles, as it pertains to the traction motor inverter and its relay system.

8. Can a weak battery cause a P317B code?

A weak or failing high-voltage battery may contribute to this code, as it can disrupt the proper operation of the traction motor inverter.

9. How much does it cost to fix the P317B code?

Repair costs can vary widely, typically ranging from $200 to $2,000, depending on whether the issue is a minor wiring repair or a major inverter component replacement.

10. Can I clear the P317B code without fixing the issue?

Clearing the code without addressing the root cause may temporarily turn off the warning light, but the issue will likely return and could lead to further complications.

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