GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2007 🢒 ION 🢒 DTC 🢒 DTC P0016

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

DTC Descriptor

DTC P0016: Crankshaft Position (CKP) - Camshaft Position (CMP) Correlation

Circuit/System Description

The engine control module (ECM) uses the crankshaft position (CKP) sensor and the camshaft position (CMP) sensor information to monitor the correlation between the crankshaft and camshaft position.

Conditions for Running the DTC
    • DTCs P0335, P0336, P0340, P0341, P0641, and P0651 are not set.
    • The engine is cranking or running.
    • DTC P0016 runs continuously when the above conditions are met.

Conditions for Setting the DTC

The ECM detects that the intake CMP sensor pulses occur less than 9 or more than 12 crankshaft degrees outside of the normal position for 25 out of 35 engine cycles.

Action Taken When the DTC Sets
    • The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
    • The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

Conditions for Clearing the MIL/DTC
    • The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    • A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
    • A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
    • Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

Inspect the engine for any recent engine mechanical repairs. An incorrectly installed camshaft, crankshaft, or timing chain can cause this DTC to set.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

    •  Engine Controls Connector End Views
    •  Engine Control Module Connector End Views

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

    •  Scan Tool Data List
    •  Scan Tool Data Definitions

Circuit/System Verification
  1. Start and run the engine.
  2. Allow the engine to reach operating temperature.
  3. Observe the DTC information with a scan tool.
    4. ⇒If the scan tool indicates DTC P0016 has failed for this ignition cycle, continue with the Circuit/System Testing.

Circuit/System Testing
  1. Ignition OFF, inspect the crankshaft balancer bolt for the proper torque. Refer to Fastener Tightening Specifications .
    2. ⇒If the crankshaft balancer bolt is not at the proper torque, refer to Crankshaft Balancer Replacement .
  2. Inspect for correct installation of the CMP sensor. Refer to Camshaft Position Sensor Replacement - Intake .
  3. Inspect the engine for correct valve timing. Refer to Camshaft Timing Chain, Sprocket, and Tensioner Replacement .

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.