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P1651 Nissan Code - Starter Motor Relay

Quick Answer

The P1651 code for Nissan vehicles indicates a problem with the starter motor relay. Common causes include Starter motor relay failure: The relay itself may be faulty or damaged, Electrical issues: Wiring problems, loose connections, or corrosion can interfere with the relay's function, Battery issues: A weak or failing battery may not provide enough power to engage the starter motor relay. 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 Starter motor relay failure: The relay itself may be faulty or damaged, Electrical issues: Wiring problems, loose connections, or corrosion can interfere with the relay's function, Battery issues: A weak or failing battery may not provide enough power to engage the starter motor relay.
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 P1651 Nissan Description

The P1651 code for Nissan vehicles indicates a problem with the starter motor relay. The starter motor relay is a crucial component of the starting system in a vehicle, responsible for sending power to the starter motor when the ignition key is turned. When this relay fails or malfunctions, it can prevent the starter motor from receiving the necessary power to crank the engine, resulting in the vehicle's inability to start.

OBDII Code P1651 Nissan - Starter Motor Relay
P1651 Nissan Code - Starter Motor Relay

Common Causes of P1651 Nissan

  1. Starter motor relay failure: The relay itself may be faulty or damaged.
  2. Electrical issues: Wiring problems, loose connections, or corrosion can interfere with the relay's function.
  3. Battery issues: A weak or failing battery may not provide enough power to engage the starter motor relay.
  4. Ignition switch problems: Issues with the ignition switch can prevent the relay from receiving the signal to start the vehicle.
  5. Faulty starter motor: A malfunctioning starter motor can also trigger this code as it may not be receiving power from the relay.

Symptoms of P1651 Nissan

  1. Intermittent starting issues: The vehicle may start sporadically or require multiple attempts to start.
  2. Clicking sound when turning the key: A clicking noise may be heard when attempting to start the vehicle.
  3. Engine cranks but does not start: The engine may crank when the key is turned, but it does not start.
  4. No response when turning the key: The vehicle may not respond at all when the key is turned in the ignition.

How to Fix P1651 Nissan

  1. Diagnostic testing: Use a scan tool to retrieve the trouble code and perform a thorough diagnosis of the starting system.
  2. Inspect the starter motor relay: Check the relay for any signs of damage or wear and tear. Replace if necessary.
  3. Check electrical connections: Inspect the wiring, connectors, and terminals for any corrosion, loose connections, or damage. Repair or replace as needed.
  4. Test the battery: Ensure the battery is in good condition and holding a proper charge. Replace if necessary.
  5. Verify ignition switch operation: Test the ignition switch to ensure it is sending the proper signals to the starter motor relay.

Cost to Fix P1651 Nissan

The cost of repairing a starter motor relay issue can vary depending on the extent of the damage and the specific components that need to be replaced. On average, the cost of replacing a starter motor relay can range from $100 to $300, including parts and labor. Keep in mind that diagnostic time and labor rates at auto repair shops can impact the overall cost, so it's recommended to get a quote from a trusted mechanic before proceeding with the repair.

What does this mean?

Tech Notes for P1651 Nissan

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

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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.

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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