AutoCodes – Nissan – P2100 2011 Nissan Altima Sedan

P2100 2011 Nissan Altima Sedan Code - Throttle Control Motor Relay Circuit Open

Quick Answer

The throttle actuator is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve. Common causes include Dirty throttle body, Faulty Throttle Actuator Control Motor Relay, Throttle Actuator Control Motor Relay harness is open. 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: P2100 2011 Nissan Altima Sedan indicates Throttle Control Motor Relay Circuit Open.
Common causes: Common causes include Dirty throttle body, Faulty Throttle Actuator Control Motor Relay, Throttle Actuator Control Motor Relay harness is open.
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 3,366

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Feb 28, 2019

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2100 2011 Nissan Altima Sedan Description

The throttle actuator is operated by the Engine Control Module (ECM) and it opens and closes the throttle valve. Power supply for the throttle control motor is provided to the ECM via throttle control motor relay. The throttle control motor relay is ON/OFF controlled by the ECM. When the ignition switch is turned ON, the ECM sends an ON signal to throttle control motor relay and battery voltage is provided to the ECM. When the ignition switch is turned OFF, the ECM sends an OFF signal to throttle control motor relay and battery voltage is not provided to the ECM. The opening angle of the throttle valve is detected by the throttle position sensor which is mounted on the throttle body. The throttle position sensor provides feedback to the ECM. This feedback allows the ECM to control the throttle actuator and monitor the throttle opening angle in response to driver inputs.

OBDII Code P2100 2011 Nissan Altima Sedan - Throttle Control Motor Relay Circuit Open - AutoCodes.com — P2100 2011 Nissan Altima Sedan Code - Throttle Control Motor Relay Circuit Open

What does this mean?

What are the Possible Causes of the DTC P2100 2011 Nissan Altima Sedan?

Dirty throttle body
Faulty Throttle Actuator Control Motor Relay
Throttle Actuator Control Motor Relay harness is open
Throttle Actuator Control Motor Relay circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2100 2011 Nissan Altima Sedan?

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

Check Fuse #43 (see picture)

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2100 2011 Nissan Altima Sedan 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.

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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 P2100 2011 Nissan Altima Sedan Code

1. What does the OBDII code P2100 indicate on a 2011 Nissan Altima Sedan?

The P2100 code indicates that there is a malfunction in the throttle control motor relay circuit, specifically that the circuit is open.

2. What are common symptoms of code P2100 in a 2011 Nissan Altima Sedan?

Symptoms may include erratic or non-responsive throttle response, reduced engine power, a check engine light, or the engine entering a fail-safe mode to prevent further damage.

3. What causes the P2100 code to appear on a 2011 Nissan Altima Sedan?

Common causes include a faulty throttle control motor relay, poor electrical connections in the throttle control motor relay circuit, or a broken wire within the circuit.

4. How can I diagnose the cause of a P2100 code in a 2011 Nissan Altima Sedan?

Diagnosis should start with a visual inspection of the throttle control motor relay and its circuitry for any signs of damage or loose connections. Following this, using a multimeter to check for continuity and proper voltage in the relay circuit can help pinpoint the issue.

5. What steps can be taken to repair the P2100 code on a 2011 Nissan Altima Sedan?

Repair steps typically involve replacing the faulty throttle control motor relay, repairing any damaged wiring or connectors in the relay circuit, and clearing the code from the ECU after repairs to verify the fix.

6. Is it safe to drive a 2011 Nissan Altima Sedan with the P2100 code?

While the vehicle may still be drivable, driving with this code is not recommended as it can lead to reduced engine performance and potentially cause the vehicle to enter a fail-safe mode, making it less predictable and safe on the road.

7. Can a P2100 code affect the fuel economy of a 2011 Nissan Altima Sedan?

Yes, since the throttle control affects the engine's air intake, an issue here can lead to poor combustion efficiency, which in turn could reduce fuel economy.

8. How urgent is it to fix a P2100 code on a 2011 Nissan Altima Sedan?

It is relatively urgent to address this issue because ongoing problems with the throttle control can lead to further engine performance issues and potential safety concerns while driving.

9. Are there any special tools required to diagnose and repair the P2100 code on a 2011 Nissan Altima Sedan?

A digital multimeter and an OBDII scanner are essential tools for diagnosing this issue. Additionally, basic hand tools may be needed to access and replace the throttle control motor relay.