4.6 LH2 Northstar Engine with DTC P0171 , P0175 - kw code ECM air filter

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

04 XLR 4.6L LH2 Northstar Engine with DTC P0171, P0175

If you have determined this vehicle has the concern of a DTC P0171, P0175 and you have completed the published diagnostics with no resolution, inspect the engine air cleaner outlet "T" duct for any heavy plastic build up (resulting in a rough interior) and replace as necessary.

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Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.

(04 XLR with the 4.6L LH2 Northstar engine)

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