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P1651 Nissan 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 Nissan 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.
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Code Popularity 12,069
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Sep 18, 2020
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Code P1651 Nissan 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 Nissan - Starter Motor Relay - AutoCodes.com
P1651 Nissan Code - Starter Motor Relay
What does this mean?

What are the Possible Causes of the DTC P1651 Nissan?

  • 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 Nissan?

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 Nissan 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 Nissan code?

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

Need Help with the Code?

Get the P1651 Nissan 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.

Frequently Asked Questions about P1651 Nissan Code

1. What does the OBDII code P1651 mean on a Nissan?

P1651 indicates an issue with the Starter Motor Relay circuit, suggesting a potential fault in the relay, wiring, or related components.

2. What are the symptoms of the P1651 code in a Nissan?

Common symptoms include the engine not starting, intermittent starting issues, or a lack of response when turning the key.

3. What causes the P1651 code in a Nissan vehicle?

Possible causes include a faulty starter motor relay, damaged wiring or connectors, a blown fuse, or issues with the Engine Control Module (ECM).

4. How do you diagnose the P1651 code on a Nissan?

Diagnosis involves checking the starter relay, inspecting the wiring and connectors for damage, verifying the fuse, and testing the ECM for faults.

5. Can a bad starter motor relay cause the P1651 code?

Yes, a faulty starter motor relay is one of the primary causes of the P1651 code.

6. How can I fix the P1651 code on my Nissan?

Repairs may include replacing the starter motor relay, repairing or replacing damaged wiring, checking and replacing fuses, or addressing ECM issues if necessary.

7. Can I drive my Nissan with the P1651 code?

Driving may not be possible since the code often prevents the engine from starting, and the issue should be repaired promptly.

8. How much does it cost to fix the P1651 code on a Nissan?

The repair cost varies but typically ranges from $50 to $150 for a starter relay replacement, excluding potential wiring or ECM repairs.

9. Can a weak battery cause the P1651 code on a Nissan?

While uncommon, a weak or failing battery may indirectly contribute to starting issues, so it’s worth checking the battery health.

10. Is resetting the ECM enough to clear the P1651 code?

Resetting the ECM may temporarily clear the code, but the underlying issue must be resolved to prevent the code from returning.

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