2000 - 05 Chevrolet WB Delayed Crank or No Crank - kw click crank delay DTC hard ignition intermittent long mode no nocrank nostart power start voltage

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

No crank or delayed crank, may be necessary to hold key in start several seconds until vehicle cranks and starts.

FOR A NO CLICK NO CRANK CONCERN:

If the BCM does not send the VTD code to the PCM, the PCM will not energize the crank relay even if there is battery voltage at the PCM on the crank circuit 806. The BCM will not send the VTD code until the ignition 3 is at or near 0 volts and ignition 1 is at battery voltage or if there is a power mode mismatch. NOTE: If there is a power mode mismatch due to a wire or terminal concern the BCM will not set a DTC if this occurs before the vehicle is started. If the engine is running and there is a power mode mismatch DTC B1440 will set. The ignition switch power modes should be checked on the scan tool and if necessary at the BCM connectors for correct operation.

FOR A DELAYED CRANK CONCERN:

If any after-market devices are connected to CIG/AUX fuse circuits 143, remove the device and re-evaluate the concern. These circuits are blunt cut and are provided to accommodate after-market devices. Refer to document number 859128 for the wiring schematic. Any after-market device that utilizes a capacitor as part of its electrical architecture can cause the ignition 3 buss to slowly bleed down from 12 volts to 0 volts when battery voltage is removed from the buss during crank. The BCM will not send the VTD code until this ignition 3 buss is at or near 0 volts. This bleed down can take several seconds depending on the size of the capacitor in the after-market device. If removing the device resolves this condition, the device must be removed or relocated to different circuits.

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.

(2000 - 2005 Chevrolet Impala) and (2000 - 2005 Chevrolet Monte Carlo)