Chevrolet Trax: DTC P0324, P0326, OR P06B6

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 P0324

Knock Sensor Module Performance

DTC P0326

Knock Sensor Performance

DTC P06B6

Control Module Knock Sensor Processor Performance

Diagnostic Fault Information

Circuit/System Description

The knock sensor enables the engine control module (ECM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The knock sensor produces an alternating current (AC) voltage signal that varies depending on the vibration level during engine operation. The ECM adjusts the spark timing based on the amplitude and the frequency of the knock sensor signal. The ECM learns a minimum knock sensor noise level for all of the engine speed ranges and monitors the normal knock sensor signal. The ECM monitors the internal knock sensor processor test circuits which perform the open circuit diagnostic.

Conditions for Running the DTCs

P0324 or P0326

• Engine speed is between 400 and 8,500 RPM.
• Engine is running for greater than 2 s.
• The engine coolant temperature (ECT) is warmer than -40ºC (-40ºF).
• The intake air temperature (IAT) sensor 1 is warmer than -40ºC (-40ºF).

AND

• Engine speed is 400 RPM or greater for 200 or more cumulative revolutions.

OR

• Engine speed is 8,500 RPM or greater.

P06B6

• Engine speed is between 500 and 5,500 RPM for 100 or more cumulative revolutions.
• Engine is running for greater than 2 s.

The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTCs

P0324

The ECM detects that the knock sensor signal performance is out of the normal calibrated range due to excessive engine knock on a per cylinder basis.

P0326

The ECM detects that the knock sensor signal performance is out of the normal calibrated range due to a low signal level.

P06B6

The ECM has detected a fault in the knock sensor processor open circuit diagnostic internal test circuit.

Action Taken When the DTCs Set

• DTCs P0324, P0326, and P06B6, are Type B DTCs.
• The ignition timing is retarded to reduce the potential of engine damaging spark knock.

Conditions for Clearing the DTCs

DTCs P0324, P0326, and P06B6 are Type B DTCs.

Reference Information

Description and Operation

Electronic Ignition System Description

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (LUV) , Powertrain Diagnostic Trouble Code (DTC) Type Definitions (2H0)

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Engine Running
2. Verify DTC P0325, P0327, P0328 or P06B6 is not set.

• IF DTC P0325, P0327, or P0328 is set with P06B6

Refer to DTC P0325, P0327, or P0328 .

• If only DTC P06B6 is set

Replace the K20 Engine Control Module.

• If none of the DTCs are set

3. Ignition OFF.
4. Verify none of the conditions listed below exist:

• Physical damage.
• Incorrect B68 Knock Sensor installation. Refer to Fastener Tightening Specifications .
• B68 Knock Sensor and engine mounting surface burrs, casting flash, and foreign material.
• Close proximity of hoses, brackets, and engine wiring.
• Loose brackets.
• Loose or broken accessory drive belts, brackets, components.
• An engine mechanical condition. Refer to Symptoms - Engine Mechanical .
• If a condition exists

Repair or replace as necessary.

• If no conditions exist

5. 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 data.

• If the DTC sets

Test or replace the B68 Knock Sensor.

• If the DTC does not set

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

• Knock Sensor Replacement
• Control Module References for engine control module replacement, programming, and setup.

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