AutoCodes – GMC – P1400 GMC

P1400 GMC 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 GMC 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 12,386

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

What does this mean?

What are the Possible Causes of the DTC P1400 GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

Get the P1400 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P1400 2014 GMC Sierra — Cold Start Emission Reduction Control System
P1400 2015 GMC Sierra — Cold Start Emission Reduction Control System
P1400 2016 GMC Sierra — Cold Start Emission Reduction Control System
P1400 2017 GMC Sierra — Cold Start Emission Reduction Control System
P1400 2018 GMC Sierra — Cold Start Emission Reduction Control System

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 GMC Code

1. What are the common symptoms of OBDII code P1400 GMC related to the Cold Start Emission Reduction Control System?

- Common symptoms include rough idle upon cold start, decreased fuel efficiency, and potential stalling of the engine.

2. What are the possible causes of OBDII code P1400 GMC being triggered?

- The code is often triggered by a faulty Cold Start Emission Reduction Control System valve, wiring issues, or a malfunctioning control module.

3. How can I diagnose the source of OBDII code P1400 GMC in my GMC vehicle?

- Using a diagnostic scanner, you can pinpoint the exact cause by checking for specific codes, testing the functionality of the valve, and inspecting the wiring for any damage.

4. What are some repair tips for addressing OBDII code P1400 GMC?

- Repair options may include replacing the Cold Start Emission Reduction Control System valve, repairing any damaged wiring, or reprogramming the control module if necessary.

5. Can driving with OBDII code P1400 GMC cause further damage to my vehicle?

- While driving with the code may not immediately harm your vehicle, it is recommended to address the issue promptly to prevent potential long-term damage and maintain optimal engine performance.

6. Is it possible to reset OBDII code P1400 GMC without addressing the underlying issue?

- Resetting the code without fixing the underlying problem will only temporarily clear the code, and it is likely to reappear once the system detects the issue again.

7. Are there any preventative maintenance measures to avoid OBDII code P1400 GMC in the future?

- Regularly checking and maintaining the Cold Start Emission Reduction Control System components can help prevent issues that may trigger OBDII code P1400 in the future.

8. Can a DIY enthusiast repair OBDII code P1400 GMC on their own?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the issue by following repair guides specific to their GMC model.

9. How long does it typically take to repair OBDII code P1400 GMC?

- The repair time can vary based on the exact cause of the code, but generally, it may take anywhere from 1-3 hours to diagnose and address the issue effectively.

10. Will fixing OBDII code P1400 GMC improve my vehicle's overall performance?

- Addressing the code and resolving the underlying issue can lead to improved engine performance, better fuel efficiency, and overall smoother operation of your GMC vehicle.