AutoCodes – Infiniti – P1651 Infiniti

P1651 Infiniti Code - Starter Motor Relay

Quick Answer

The Engine Control Module (ECM) controls ON/OFF state of the starter relay, according to the engine and vehicle condition. Common causes include Faulty Intelligent Power Distribution Module (IPDM) Engine Room (E/R), IPDM E/R harness is open or shorted, IPDM E/R 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: P1651 Infiniti indicates Starter Motor Relay.
Common causes: Common causes include Faulty Intelligent Power Distribution Module (IPDM) Engine Room (E/R), IPDM E/R harness is open or shorted, IPDM E/R 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,190

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 18, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1651 Infiniti Description

The Engine Control Module (ECM) controls ON/OFF state of the starter relay, according to the engine and vehicle condition. The ECM transmits a control signal to the Intelligent Power Distribution Module (IPDM) Engine Room (E/R) by CAN communication. Under normal conditions, the ECM controls and maintains the starter relay in OFF state during the following condition: The engine is running, the selector lever is D position. (CVT models), and the clutch pedal is fully released. (M/T models). When detecting a decrease in engine speed due to rapid deceleration or heavy load conditions, ECM controls and reactivates the starter relay. The IPDM E/R detects a control state of the starter relay and starter control relay and transmits a feedback signal to ECM via CAN communication. The Diagnostic Trouble Code (DTC) will set when a correlated error is detected for 2 seconds or more between a control signal transmitted from ECM and a feedback signal transmitted from IPDM E/R via CAN communication line.

OBDII Code P1651 Infiniti - Starter Motor Relay - AutoCodes.com — P1651 Infiniti Code - Starter Motor Relay

What does this mean?

What are the Possible Causes of the DTC P1651 Infiniti?

Faulty Intelligent Power Distribution Module (IPDM) Engine Room (E/R)
IPDM E/R harness is open or shorted
IPDM E/R circuit poor electrical connection

How to Fix the DTC P1651 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 does this mean?

Code Tech Notes

The Starter Motor Relay is part of the Intelligent Power Distribution Module (IPDM) Engine Room (E/R) and is not serviceable.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1651 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 P1651 Infiniti code?

Need more information on how to fix the P1651 Infiniti code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1651 Infiniti 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.