AutoCodes – GMC – P214F GMC

P214F GMC Code - Reductant Heater 1 Current Too High

Quick Answer

The Selective Catalyst Reduction (SCR) system reduces Oxides of Nitrogen (NOx) emissions by injecting a metered amount of Diesel Exhaust Fluid (DEF) or reductant into the exhaust gas stream entering the SCR catalyst. Common causes include Faulty Reductant Heater 1, Reductant Heater 1 harness is open or shorted, Reductant Heater 1 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: P214F GMC indicates Reductant Heater 1 Current Too High.
Common causes: Common causes include Faulty Reductant Heater 1, Reductant Heater 1 harness is open or shorted, Reductant Heater 1 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 1,580

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Sep 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P214F GMC Description

The Selective Catalyst Reduction (SCR) system reduces Oxides of Nitrogen (NOx) emissions by injecting a metered amount of Diesel Exhaust Fluid (DEF) or reductant into the exhaust gas stream entering the SCR catalyst. Within the SCR catalyst, the reductant reacts with the NOx to form nitrogen, carbon dioxide, and water vapor. Upstream and downstream NOx sensors provide the Engine Control Module (ECM) with engine-out and tailpipe-out NOx levels in Parts Per Million (ppm). The ECM then adjusts the amount of reductant injected upstream of the SCR based on the NOx concentration. Engine-out NOx levels as measured by NOx Sensor 1 will either increase (high ppm) or decrease (low ppm) the amount of reductant injected. The NOx concentration as measured by NOx Sensor 2 provides the ECM with both an indication of the NOx conversion efficiency within the SCR as well as confirming the proper operation of the reductant system. The Diagnostic Trouble Code (DTC) will be set when the Glow Plug Control Module (GPCM) detects a heater short circuit by detecting a high current in the heater.

OBDII Code P214F GMC - Reductant Heater 1 Current Too High - AutoCodes.com — P214F GMC Code - Reductant Heater 1 Current Too High

What does this mean?

What are the Possible Causes of the DTC P214F GMC?

Faulty Reductant Heater 1
Reductant Heater 1 harness is open or shorted
Reductant Heater 1 circuit poor electrical connection
Faulty Glow Plug Control Module (GPCM)

How to Fix the DTC P214F 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 P214F 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.

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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 P214F GMC Code

1. What are the common symptoms of OBDII code P214F GMC (Reductant Heater 1 Current Too High)?

The common symptoms include the check engine light illuminating on the dashboard, reduced engine performance, and potential issues with the Selective Catalytic Reduction (SCR) system.

2. What are the possible causes of OBDII code P214F GMC?

Potential causes of this code include a faulty reductant heater 1, damaged wiring or connectors in the reductant heater circuit, software issues, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose OBDII code P214F GMC?

Diagnosing this code typically involves using a diagnostic scanner to retrieve the fault codes, checking the wiring and connectors in the reductant heater circuit for damage, and testing the reductant heater 1 for proper function.

4. Can a DIYer repair OBDII code P214F GMC?

Repairing this code may require specialized tools and knowledge, so it's recommended to consult with a professional mechanic or dealership for proper diagnosis and repair.

5. Is it safe to continue driving with OBDII code P214F GMC active?

It's not recommended to continue driving with this code active, as it can lead to further damage to the SCR system and potentially affect vehicle emissions compliance.

6. How much does it typically cost to repair OBDII code P214F GMC?

The cost of repairing this code can vary depending on the underlying cause, but it may involve replacing the reductant heater 1, repairing damaged wiring or connectors, or addressing PCM issues.

7. Can a reductant heater 1 failure cause other issues in the vehicle?

A malfunctioning reductant heater 1 can potentially affect the efficiency of the SCR system, leading to increased emissions and reduced engine performance if left unrepaired.

8. Are there any preventive measures to avoid OBDII code P214F GMC?

Regular maintenance and inspections of the SCR system, including checking the reductant heater 1 and its connections, can help prevent issues that may trigger this fault code.

9. How long does it typically take to repair OBDII code P214F GMC?

The repair time can vary depending on the exact cause of the code and the availability of parts, but it's advisable to consult with a mechanic for a more accurate estimate.

10. Can resetting the fault codes clear OBDII code P214F GMC?

Resetting the fault codes may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's essential to diagnose and repair the root cause of the problem.