AutoCodes – GMC – P202E GMC

P202E GMC Code - Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1

Quick Answer

The Selective Catalytic 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 Fluid Injector, Reductant Fluid Injector harness is open or shorted, Reductant Fluid Injector 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: P202E GMC indicates Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1.
Common causes: Common causes include Faulty Reductant Fluid Injector, Reductant Fluid Injector harness is open or shorted, Reductant Fluid Injector 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 6,331

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
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Code P202E GMC Description

The Selective Catalytic 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 DEF 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. The ECM varies the amount of DEF added by varying the reductant injector duty-cycle in response to changes in engine-out NOx levels.

OBDII Code P202E GMC - Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1 - AutoCodes.com — P202E GMC Code - Reductant Injection Valve Circuit Range/Performance Bank 1 Unit 1

What does this mean?

What are the Possible Causes of the DTC P202E GMC?

Faulty Reductant Fluid Injector
Reductant Fluid Injector harness is open or shorted
Reductant Fluid Injector circuit poor electrical connection

How to Fix the DTC P202E 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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P202E 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.