AutoCodes – Infiniti – P1720 Infiniti

P1720 Infiniti Code - Vehicle Speed Meter Circuit Malfunction

Quick Answer

The Engine Control Module (ECM) receives two vehicle speed sensor signals via the Control Area Network (CAN) communication line. Common causes include VDC/TCS/ABS to ECM circuit harness is open or shorted, TCM to ECM circuit harness is open or shorted, VDC/TCS/ABS to ECM circuit connectors. 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: P1720 Infiniti indicates Vehicle Speed Meter Circuit Malfunction.
Common causes: Common causes include VDC/TCS/ABS to ECM circuit harness is open or shorted, TCM to ECM circuit harness is open or shorted, VDC/TCS/ABS to ECM circuit connectors.
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 6,929

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 Sep 12, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1720 Infiniti Description

The Engine Control Module (ECM) receives two vehicle speed sensor signals via the Control Area Network (CAN) communication line. One is sent from Vehicle Dynamic Control (VDC) / Traction Control System (TCS) / Anti-Lock Brake System (ABS) control unit, and the other is from Transmission Control Module (TCM). ECM uses these two signals for engine control.

OBDII Code P1720 Infiniti - Vehicle Speed Meter Circuit Malfunction - AutoCodes.com — P1720 Infiniti Code - Vehicle Speed Meter Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P1720 Infiniti?

VDC/TCS/ABS to ECM circuit harness is open or shorted
TCM to ECM circuit harness is open or shorted
VDC/TCS/ABS to ECM circuit connectors
TCM to ECM circuit connectors
Faulty revolution sensor

How to Fix the DTC P1720 Infiniti?

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 P1720 Infiniti 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 P1720 Infiniti code?

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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.