P0018

DTC P0016, P0017, P0018, or P0019

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category

DTC Descriptors
DTC P0016
- Crankshaft Position (CKP) - Intake Camshaft Position (CMP) Correlation Bank 1

DTC P0017
- Crankshaft Position (CKP) - Exhaust Camshaft Position (CMP) Correlation Bank 1

DTC P0018
- Crankshaft Position (CKP) - Intake Camshaft Position (CMP) Correlation Bank 2

DTC P0019
- Crankshaft Position (CKP) - Exhaust Camshaft Position (CMP) Correlation Bank 2

Circuit/System Description

The engine control module (ECM) uses the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor pulses to monitor the correlation between the crankshaft and the camshaft position. An improper relative position can be caused by either engine timing or improper indexing of the camshaft drive chain.

Conditions for Running the DTC

* DTC P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, P0391, P0641, or P0651 is not set.
* The engine speed is less than 1,200 RPM and the CMP actuator is commanded to the home or parked position.
* The engine is running.
* DTC P0016, P0017, P0018, and P0019 run continuously once the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the CMP sensor pulses occur less than or greater than 9 crankshaft degrees outside of the normal position for 25 out of 35 engine cycles.

Action Taken When the DTC Sets

* DTC P0016, P0017, P0018, P0019 are Type B DTCs.
* The CMP actuators are commanded to the home or parked position.

Conditions for Clearing the MIL/DTC

DTC P0016, P0017, P0018, P0019 are Type B DTCs.

Diagnostic Aids

* Inspect the engine for any recent engine mechanical repairs. An incorrectly installed timing chain can cause this DTC to set.
* A camshaft actuator stuck in the full actuation position may cause the engine to crank but not start.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

Camshaft Actuator System Description (Camshaft Actuator System)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition ON, observe the DTC information with a scan tool. Verify that none of the following DTCs are set. DTC P0010, P0013, P0020, P0023, P0335, P0336, P0340, P0341, P0345, P0346, P0365, P0366, P0390, or P0391.

• If any of the DTCs listed are set refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.

2. Idle the engine at the normal operating temperature. Observe the DTC information with a scan tool. DTCs P0016, P0017, P0018, or P0019 should not set.

• If a DTC sets, inspect for the following and repair as necessary:

* The correct installation of the camshaft sensors
* The correct installation of the crankshaft sensor
* A timing chain tensioner condition
* An incorrectly installed timing chain
* Excessive play in the timing chain
* A mechanical cam actuator that is stuck in the full advance or retard position.
* A timing chain that jumped teeth
* A crankshaft reluctor wheel that has moved in relationship to top dead center (TDC) on the crankshaft

3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Camshaft Timing Drive Components Cleaning and Inspection (65. Camshaft Timing Drive Components Cleaning and Inspection) for timing chain, sprockets, and CMP actuator filter screen replacement