4.6L ( L37 , LD8 ) Engine with a Lack of Power and Possible DTC P0336 - knock MIL sensor

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

2004 4.6L( L37, LD8) Engine with a lack of power and possible DTC P0336.

The 2004 4.6L(L37, LD8) engine is equipped with dual knock sensors: The harness pigtails can be easily switched to the opposite bank i.e.: the left side input on the right bank and the right side input on the left bank. The complaint would be lack of power because spark is retarding, retarding, retarding and no results. The other scenario is that a circuit code sets for one bank and the tech is looking at the wrong side to correct the concern. The correct routing is the longer harness lead goes to the rear bank. Changes are being made in production to have color-coding to identify the front and rear knock sensor harness.

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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.

(2004 CADILLAC DEVILLE 4.6L (LD8) ENGINE) and (2004 CADILLAC DEVILLE 4.6L (L37) ENGINE) and (2004 CADILLAC SEVILLE 4.6L (LD8) ENGINE) and (2004 CADILLAC SEVILLE 4.6L (L37) ENGINE)

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