AutoCodes – GMC – P1400 2014 GMC Sierra

P1400 2014 GMC Sierra Code - Cold Start Emission Reduction Control System

Quick Answer

The catalytic converter must be warmed to efficiently reduce emissions. Common causes include Dirty Throttle Body, Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor. 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: P1400 2014 GMC Sierra indicates Cold Start Emission Reduction Control System.
Common causes: Common causes include Dirty Throttle Body, Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor.
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 400

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 Aug 13, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1400 2014 GMC Sierra Description

The catalytic converter must be warmed to efficiently reduce emissions. The cold start strategy is to reduce the amount of time it takes to warm the catalytic converter. During a cold start, the engine idle speed is elevated, and spark timing is retarded to allow the catalyst to warm quickly. This diagnostic monitors the following to build an exhaust energy model: Engine speed, Spark advance, Throttle position, Engine airflow, Engine coolant temperature, Engine runtime, Park/neutral position, Vehicle speed. The actual model is then compared to the expected exhaust energy model. The Diagnostic Trouble Code (DTC) will set when the actual exhaust energy model does not match the expected exhaust energy model.

OBDII Code P1400 2014 GMC Sierra - Cold Start Emission Reduction Control System - AutoCodes.com — P1400 2014 GMC Sierra Code - Cold Start Emission Reduction Control System

What does this mean?

What are the Possible Causes of the DTC P1400 2014 GMC Sierra?

Dirty Throttle Body
Dirty Air Filter
Dirty Mass Air Flow (MAF) Sensor
Intake manifold leak
Exhaust leak
Damaged, restricted, modified or enhanced exhaust system

How to Fix the DTC P1400 2014 GMC Sierra?

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 P1400 2014 GMC Sierra 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 P1400 2014 GMC Sierra code?

Need more information on how to fix the P1400 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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.

Frequently Asked Questions about P1400 2014 GMC Sierra Code

What does the OBDII code P1400 mean for a 2014 GMC Sierra?

The OBDII code P1400 indicates a malfunction in the Cold Start Emission Reduction Control System, which is designed to reduce emissions during engine cold starts.

What are common symptoms associated with the P1400 code?

Common symptoms include poor engine performance, increased emissions, reduced fuel efficiency, and the check engine light being illuminated.

What could cause the P1400 code to trigger?

Causes may include a faulty cold start emission reduction control system, damaged or disconnected vacuum hoses, a malfunctioning engine coolant temperature sensor, or issues with the engine control module (ECM).

How can I diagnose the P1400 code?

To diagnose the P1400 code, use an OBDII scanner to confirm the code, inspect the cold start emission reduction components, check for vacuum leaks, and test the engine coolant temperature sensor.

What are some common repairs for the P1400 code?

Common repairs include replacing faulty components in the cold start emission reduction system, fixing or replacing damaged vacuum hoses, or reprogramming/replacing the ECM if itâ€™s determined to be defective.

Is it safe to drive with the P1400 code?

While it may be safe to drive, it is advisable to address the issue promptly as it can lead to increased emissions and potential long-term engine damage.

Can the P1400 code affect fuel efficiency?

Yes, the P1400 code can negatively impact fuel efficiency due to improper air-fuel mixture during cold starts, leading to less efficient combustion.

Will clearing the P1400 code fix the underlying issue?

No, clearing the code will not fix the underlying problem. It is essential to diagnose and repair the root cause to prevent the code from reappearing.

How do I clear the P1400 code after repairs?

You can clear the P1400 code using an OBDII scanner or by disconnecting the vehicle's battery for a short period, but ensure that the underlying issue is resolved first.