Diagnostic Aids

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

An intermittent CMP sensor signal may cause DTC P0341 to set. Wiggle the wiring harness with the engine running and observe the Cam Signal Missed parameter of the scan tool. If the parameter indicates anything other than 0, there is an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections and Inducing Intermittent Fault Conditions in Wiring Systems.
A short from the 12-volt reference circuit to the low reference circuit internally in the camshaft position (CMP) or crankshaft position (CKP) sensor can cause all three DTCs P0336, P0340, P0341, and P0016 to set.
If the CMP sensor signal is lost while running, the engine will operate normally. If the CMP sensor signal is not present on start-up, the engine will not start.

DTC P0341

Step	Action	Yes	No
Schematic Reference: Engine Controls Schematics Connector End View Reference: Engine Control Module (ECM) Connector End Views or Engine Controls Connector End Views
1	Did you perform the Diagnostic System Check- Engine Controls?	Go to Step 2	Go to Diagnostic System Check - Engine Controls
2	Observe the Freeze Frame/Failure Records data for this DTC. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	Go to Step 3	Go to Diagnostic Aids
3	Inspect all of the circuits going to the camshaft position (CMP) sensor for the following conditions: Routed too closely to fuel injection wiring or components Routed too closely to after-market add-on electrical equipment Routed too closely to solenoids, relays, and motors If you find incorrect routing, correct the harness routing. Did you find and correct the condition?	Go to Step 9	Go to Step 4
4	Test for an intermittent and for a poor connection at the CMP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 9	Go to Step 5
5	Test for an intermittent and for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 9	Go to Step 6
6	Remove the CMP sensor. Refer to Camshaft Position (CMP) Sensor Replacement . Inspect the CMP sensor for signs of damage. If the CMP is damaged, refer to Camshaft Position (CMP) Sensor Replacement . Did you find and correct the condition?	Go to Step 9	Go to Step 7
7	Inspect the CMP reluctor wheel for damage. If the CMP reluctor wheel is damaged, refer to Camshaft Reluctor Replacement in Engine Mechanical-6.6L. Did you find and correct the condition?	Go to Step 9	Go to Step 8
8	Replace the CMP sensor. Refer to Camshaft Position (CMP) Sensor Replacement . Did you complete the replacement?	Go to Step 9	-
9	Clear the DTCs with a scan tool. Turn OFF the ignition for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition?	Go to Step 2	Go to Step 10
10	Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed?	Go to Diagnostic Trouble Code (DTC) List	System OK