P0171 Diagnostic Guide
P0171 may indicate the fuel trim correction has moved too far in the lean direction for the controller to compensate.
Article vehicle: 2020-2025 Chevrolet Silverado 2500 6.6 diesel
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P0171: P0171 Diagnostic Guide
Vehicle-specific published guides for this diagnostic trouble code.
P0171 Diagnostic Guide
P0171 often indicates the engine controller may be correcting for a lean condition on bank 1.
Article vehicle: 2014-2018 Gmc Sierra 1500 5.3 gas
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P0171 Diagnostic Guide
P0171 generally means the ECM may be correcting for a lean air-fuel condition on one side of the engine.
Article vehicle: 2019-2025 Chevrolet Silverado 1500 5.3 gas
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P0171 Diagnostic Guide
P0171 may mean the PCM is adding fuel because bank 1 appears lean during fuel control.
Article vehicle: 2011-2022 Ford F250 Superduty 6.2 Gas
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P0171 Diagnostic Guide
P0171 often means the engine computer may be seeing a lean condition on bank 1.
Article vehicle: 2015-2025 Ford F150 2.7 EcoBoost
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P0171 Diagnostic Guide
P0171 may indicate the engine control system is seeing a possible lean condition on one side of the engine.
Article vehicle: 2015-2025 Ford F150 2.7 EcoBoost
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P0171 Diagnostic Guide
P0171 often means the PCM may be correcting for a lean condition on Bank 1 by adding fuel until adaptive fuel control reaches its limit.
Article vehicle: 2015-2025 Ford F150 3.5 EcoBoost
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P0171 Diagnostic Guide
P0171 may mean Bank 1 fuel control is correcting lean and the PCM has reached a rich adaptive limit while trying to compensate.
Article vehicle: 2020-2025 Ford F250 Superduty 7.3GodzillaGas
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P0171 Diagnostic Guide
P0171 may indicate the PCM is seeing Fuel System 1/1 as lean and may be adding fuel to compensate.
Article vehicle: 2019-2024 Ram 1500Classic 3.6PentastarGas
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P0171 Diagnostic Guide
P0171 may indicate the PCM is seeing a lean fuel correction trend on Bank 1.
Article vehicle: 2019-2024 Ram 1500Classic 5.7HEMIGas
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Fuel System Lean
P0171 means the PCM may be seeing a lean fuel mixture and may be adding fuel to compensate.
Article vehicle: 2019-2024 Ram 1500DT 5.7HEMIGas
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Fuel System 1/1 Lean
P0171 means the PCM may be seeing a lean condition on Bank 1, where fuel correction can be driven higher than expected to compensate.
Article vehicle: 2019-2025 Ram 1500DT 3.6PentastarGas
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Fuel System 1/1 Lean
P0171 means the PCM may be seeing a lean fuel mixture on fuel system 1/1 and may be adding fuel to compensate.
Article vehicle: 2019-2025 Ram 2500HD 6.4HEMIGas
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