DTC P0335, P0336, or P0338. Pontiac G8 2008

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2008 🢒 G8 🢒 Safety and Security 🢒 Supplemental Inflatable Restraints 🢒 DTC P0335, P0336, or P0338

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 Descriptors

DTC P0335: Crankshaft Position (CKP) Sensor Circuit

DTC P0336: Crankshaft Position (CKP) Sensor Performance

DTC P0338: Crankshaft Position (CKP) Sensor Circuit High Duty Cycle

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5-Volt Reference	P0122, P0222, P0335, P0698, P2127	P0335, P0697	P0335, P0338, P0699	P0336, P0697, P0698, P0699
CKP Sensor Signal	P0122, P0222, P0335, P0698, P2127	P0335	P0335, P0338, P0699	P0336, P0698, P0699
Low Reference	P0335	P0335	--	P0336

The crankshaft position (CKP) sensor is located on the rear of bank 1 of the engine block. The CKP sensor is a hall effect switch that works in conjunction with a 58X reluctor wheel that is attached to the crankshaft. Each tooth on the reluctor wheel is spaced 6 degrees apart with one span having a 12 degree space. The engine control module (ECM) uses the 12 degree space to determine top dead center (TDC) for cylinders 1 and 4. The ECM determines when cylinder 1 is on the compression stroke by monitoring the CKP sensor and the camshaft position (CMP) sensors. The ECM can synchronize the ignition timing, fuel injector timing, and spark knock control based on the CKP sensor and the CMP sensor inputs.

Conditions for Running the DTC

•	The engine is cranking or operating.

•	The ECM has detected greater than 12 camshaft revolutions.

•	The DTC P0335 and P0336 run continuously once the above conditions are met for greater than 5 seconds.

•	The DTC P0338 runs once each engine revolution once the above conditions are met for greater than 2 seconds.

Conditions for Setting the DTC

P0335

•	The ECM does not detect a signal from the CKP sensor.

•	The ECM detects a CKP signal without a reference pulse for greater than 6 revolutions.

•	Either condition exists for greater than 1 second or a cumulative of 10 seconds.

P0336

•	The ECM re-syncs the engine position 2,600 or more times during an ignition cycle.

•	The ECM detects 28 or more interruptions in the engine speed signal during an ignition cycle.

•	Either condition exists for greater than 1 second or a cumulative of 10 seconds.

P0338

•	The ECM detects a difference of greater than 250 teeth between reference gap position pulses.

•	The condition exists for greater than 1 second or a cumulative of 10 seconds.

Action Taken When the DTC Sets

DTCs P0335, P0336, and P0338 are Type A DTCs.

Conditions for Clearing the DTC

DTCs P0335, P0336, and P0338 are Type A DTCs.

Diagnostic Aids

The following conditions could also set the DTCs:

•	Physical damage to the CKP sensor or the reluctor wheel

•	Excessive play or looseness of the CKP sensor or the reluctor wheel

•	Improper installation of the CKP sensor or the reluctor wheel

•	Foreign material passing between the CKP sensor and the reluctor wheel

•	Excessive air gap between the CKP sensor and the reluctor wheel

•	The ECM uses the camshaft position sensors to determine engine speed and position when there is a CKP sensor condition.

•

The engine will operate with a CKP sensor condition only if the ECM has stored the learned reference position of the camshafts in memory. With a crankshaft position sensor condition the engine will go into a limp home mode after a restart. The ECM then calculates engine speed from one of the camshaft position sensors.

•	An intermittent condition in the camshaft position (CMP) sensor circuits can cause a CKP DTC to set. Inspect the CMP sensor, harness connections, and related wiring, if you suspect this condition.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the DTC information with a scan tool. DTC P0697, P0698, or P0699 should not be set.

⇒	If a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699.

Clear the DTC Info with a scan tool. Attempt to start the engine, observe the DTC information with a scan tool. DTC P0335, P0336, or P0338 should not set.
Observe the scan tool CKP Resync parameter, the parameter should always display zero. Move the related harnesses/connectors of the CKP sensor while observing the parameter, verify the engine does not stumble, or stall, and the parameter does not increment.
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.

Circuit/System Testing

Ignition OFF, remove the fuse that supplies B+ to terminal X2-56 of the ECM.
Disconnect the harness connector at the crankshaft position (CKP) sensor.
Test for 5 ohms or less between the low reference circuit terminal 1 and ground.

⇒	If greater than the specified range, test for an open/high resistance in the low reference circuit. If the circuits/connections test normal, replace the ECM.

Install the fuse that supplies B+ to terminal X2-56 of the ECM.
Ignition ON, test for greater than 4.8 volts between the 5-volt reference circuit terminal 3 and the low reference circuit terminal 1.

⇒	If less than the specified value, test for an open/high resistance in the 5-volt reference circuit. If the circuits/connections test normal, replace the ECM.

Test for 4.8-5.2 volts between the signal circuit terminal 2 and ground.

⇒	If the voltage is greater than specified range, test for a short to voltage in the signal circuit. If circuit/connections test normal, replace the ECM.

⇒	If the voltage is less than the specified range, test for a short to ground or an open/high resistance in the signal circuit. If circuit/connections test normal, replace the ECM.

If all circuits/connections test normal, test or replace the CKP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Crankshaft Position Sensor Replacement

•	Control Module References for engine control module replacement, setup, and programming