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p1345 code on 99 tahoe

jasonives

By jasonives
in Ask A GM Technician

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jasonives New Member

jasonives

Posted
Posted

i just ran a scan on my tahoe it came up p1345 what do i do with that now?? had a problem before it had the light come on now the engine light comes on it still has the same misfire/hesitation problem on acceleration any one got an idea??

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

This diagnostic trouble code (DTC) monitors the crankshaft position (CKP) and the camshaft position (CMP) signals to determine if they are synchronized. If both signals are not observed by the control module within a narrow time window, the vehicle control module (VCM) will determine that an error has occurred.

 

Conditions for Running the DTC

 

The engine is running

 

Conditions for Setting the DTC

 

When the engine is running, the cam sensor reference pulse is not detected at the correct position relative to the crankshaft position sensor pulse.

 

Action Taken When the DTC Sets

 

The control module illuminates the malfunction indicator lamp (MIL) the first time the diagnostic runs and fails.

 

The control module will set the DTC and records the operating conditions at the time the diagnostic fails. The control module stores the failure information in the scan tools Freeze Frame/Failure Records.

 

Conditions for Clearing the MIL or DTC

 

The control module turns OFF the MIL after 3 consecutive drive trips when the test has run and passed.

 

A history DTC will clear if no fault conditions have been detected for 40 warm-up cycles. A warm-up cycle occurs when the coolant temperature has risen 22°C (40°F) from the startup coolant temperature and the engine coolant reaches a temperature that is more than 70°C (158°F) during the same ignition cycle.

Use a scan tool in order to clear the DTCs.

 

Diagnostic Aids

 

Check the following items:

 

A loose CMP sensor causing a variance in the sensor signal

Excessive free play in the timing chain and gear assembly

Incorrectly installed distributor - 1 tooth off in either advance or retard positions

A loose distributor rotor on the distributor shaft

A loose or missing distributor hold down bolt

An intermittent may be caused by any of the following conditions:

 

A poor connection

Rubbed through wire insulation

A broken wire inside the insulation

Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

If you haven't messed with the distributor, I'd be pulling that out and looking at the gear on it. Seen a LOT where the gear is worn very badly and the teeth were so sharp you could cut your finger on 'em.

 

Replace the gear, put it back together and it's fixed... if that's your problem.

Perandall Enthusiast

Perandall

Posted
Posted

I have a 1999 Chevrolet silverado 1500 with the 4.8l Iam getting a code of p1416 air system fault bank 2 what is that and what can i do to fix it myself. The other one i am getting is c0265 ebcm relay circuit. There is a box for the abs system under the cab that when the main 60 amp fuse is in place makes a loud buzzing sound and will not go away without pulling the fuse. any suggestions anything would help at this point thanks :nopity:

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