AutoCodes – GMC – P2097 GMC

P2097 GMC Code - Post Catalyst Fuel Trim System High Limit Bank 1

Quick Answer

Fuel trim bias is used to keep the post catalyst air/fuel ratio within a predetermined range. Common causes include Exhaust system leaks, Split, kinked or improperly connected vacuum hoses, Insufficient fuel in the tank. 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: P2097 GMC indicates Post Catalyst Fuel Trim System High Limit Bank 1.
Common causes: Common causes include Exhaust system leaks, Split, kinked or improperly connected vacuum hoses, Insufficient fuel in the tank.
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 8,447

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 Sep 08, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P2097 GMC Description

Fuel trim bias is used to keep the post catalyst air/fuel ratio within a predetermined range. This allows optimal catalyst efficiency under various operating conditions. The Engine Control Module (ECM) constantly monitors how lean or rich the fuel trim bias is commanded, to determine if the fuel trim bias is greater than a calibrated amount. The Diagnostic Trouble Code (DTC) will be set when the correction limit for a condition causing a rich or lean air/fuel ratio has been exceeded.

OBDII Code P2097 GMC - Post Catalyst Fuel Trim System High Limit Bank 1 - AutoCodes.com — P2097 GMC Code - Post Catalyst Fuel Trim System High Limit Bank 1

What does this mean?

What are the Possible Causes of the DTC P2097 GMC?

Exhaust system leaks
Split, kinked or improperly connected vacuum hoses
Insufficient fuel in the tank
Leaks in the air induction system and air intake ducts
Missing air filter element
Cracked evaporative canister
Evaporative pipes plugged, obstructed, or leaking
Crankcase ventilation system leaking
Engine vacuum leaks
Low fuel system pressure
Contaminated fuel
Lean fuel injectors

How to Fix the DTC P2097 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 P2097 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 P2097 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P2097 2014 GMC Sierra — Post Catalyst Fuel Trim System High Limit Bank 1
P2097 2015 GMC Sierra — Post Catalyst Fuel Trim System High Limit Bank 1
P2097 2016 GMC Sierra — Post Catalyst Fuel Trim System High Limit Bank 1
P2097 2017 GMC Sierra — Post Catalyst Fuel Trim System High Limit Bank 1
P2097 2018 GMC Sierra — Post Catalyst Fuel Trim System High Limit Bank 1

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.