SES Light with a P1345 or P0016 and a Possible Rough Idle - kw 4.2 camshaft condition control DTC idle intermittent light LL* MIL performance poor repair rough solenoid
| Subject: | SES Light with a P1345 or P0016 and a Possible Rough Idle |
| Models: | . |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.
Condition/Concern:
Some 2002 - 2004 models that are equipped with the 4.2L (VIN S - RPO LL8) engine may experience a SES Light due to a P0016 or P1345 DTC and a possible rough idle.
Recommendation/Instructions:
If the SI diagnostics do not isolate a cause, the following information may help:
| • | Control of the Cam Phaser Actuator solenoid is inhibited when a P0016 (04 Model Year) or P1345 (02 - 03 Model Year) DTC is stored. |
| • | If this DTC started after recent internal engine repairs, inspect for proper engine mechanical timing. With the camshaft cover removed and the #1 cylinder at top dead center, make sure that the darkened chain links are lined up with the alignment marks on the exhaust and intake cam sprockets. At this point, J44221 should fit over the rear cam flats and the word Delphi (on the front of the Cam Phaser Actuator sprocket) should be parallel with the front edge of the cylinder head. Note: It may take up to 14 crankshaft revolutions before all timing alignment marks line up with each other. |
| • | Engines built after 2/5/01 include a thin friction washer (P/N 12573950) between the dampener and the crank gear and the torque specification was increased to 110 ft-lbs plus 180 degrees to prevent crankshaft gear and alignment pin damage. If there is any history of the crank dampener bolt ever being loose, the crankshaft gear and alignment pin may be damaged, which can cause these DTCs. |
| • | If a P0016 or P1345 is resetting without any engine performance concerns but the SI diagnostics and the above information did not isolate a cause for the DTC, replace the Cam Phaser Actuator sprocket. |
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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.
Models:
(04 Buick Rainier S1 T1 with the 4.2L engine) and (02 03 04 Chevrolet TrailBlazer S1 T1 with the 4.2L engine) and (02 03 04 GMC Envoy S1 T1 with the 4.2L engine) and (02 03 04 Oldsmobile Bravada S1 T1 with the 4.2L engine)
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