04 4.6L L37 Engine Crank , No Start , No Injector Pulses, Possible DTC - kw P0412 PCM connector

The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.

2004 4.6L L37 engine crank no start condition. Diagnosis may lead to no injector pulses as the cause of the no start condition. The vehicle may have some or all of these PCM codes as well, P0118, P0122, P0335, P0385, P0412, and P0340. There may also be other PCM codes present. If the battery power is removed from the ECM then reconnected, the vehicle will start and run. This condition is sometimes described as PCM logic lock up.

Correction: Reprogam the PCM with the calibration listed below or later.

12595874

YHZN Bonneville GXP, LD8, 155 MPH

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12595875

YHWF Deville, 3.11, 112 MPH

.

12595876

YHWH STS, 3.71, 155 MPH

.

12595877

YHWJ Deville, 3.71, 130 MPH

.

12595878

YHWK Deville (Limo / Hearse), 3.11, 95 MPH

.

12595879

YHWL Deville (Armored Limo), 3.71, Tier 1, 155 MPH

.

12595880

YHWM SLS, 3.11, Unleaded, 130 MPH

.

12595881

YHWN STS, 3.71, Unleaded, 155 MPH

.

12595882

YHWP Deville, 3.11, Unleaded, 130 MPH

.

12595883

YHWR Deville, 3.71, Unleaded, 130 MPH

.

12595884

YHWS STS, 3.71, European, 155 MPH

.

12595885

YHWT STS, 3.71, Japanese, 130 MPH

.

12595886

YHWU Deville, 3.11, Japanese, 112 MPH

.

12595887

YHWW Deville/SLS, 3.11, Mexico Noise Pass-by, 112 MPH

.

12595888

YHWY Deville (Limo / Hearse), 3.11, Mexico Noise Pass-by, 95 MPH

.

12595889

YHWW Deville, 3.71, Mexico Noise Pass-by, 130 MPH

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.

( 2004 Cadillac Deville DTS DHS) and (2004 Pontiac Bonneville GXP)

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