P0022 code definition
Camshaft Position A - Timing Over-Retarded (Bank 2)
What the P0022 code means
P0022 is the OBD-II generic code which indicates that the Engine Control Module (ECM) has determined the intake camshaft timing for bank 2 is more retarded than what the ECM has commanded it be. This over-retarded timing condition could be during the advancing or retarding phase of the camshaft timing.
What causes the P0022 code?
The Variable Camshaft Timing (VCT) oil control valve (OCV) gets stuck in the open position.
The camshaft phaser is damaged and gets stuck in the retarded position.
There are oil flow problems to the VCT piston and phaser.
What are the symptoms of the P0022 code?
The ECM will turn on the Check Engine Light.
The engine starts hard or hesitates on acceleration.
The fuel mileage will decrease and the engine may blow black smoke out of the tailpipe.
The engine will emit excessive fumes and may fail emissions testing.
Note: Drive complaints may change depending on the camshaft timing.
How does a mechanic diagnose the P0022 code?
Visually checks the electrical connections to the camshaft sensor
Checks the oil control solenoid valve and crankshaft sensor for loose connections or damaged wiring
Makes sure that the engine oil is clean and full, and that the viscosity is correct
Scans and documents the codes and views freeze frame data to see when the code was set
Performs a manufacturer's specific pinpoint tests for the P0022 code and repairs as directed
Common mistakes when diagnosing the P0022 code
Follow these simple guidelines to prevent mistakes:
- Always verify the failure before attempting any repairs.
- Make sure the oil viscosity is the correct type and that it is clean.
- Follow the pinpoint test step by step to help prevent a misdiagnosis.
- Do not replace parts unless pinpoint or visual testing directs you to.
How serious is the P0022 code?
Fuel mileage will go down and the engine may get carbon buildup on pistons and valves.
The engine may have a hard start, hesitation and stalling problems.
The engine emissions may exceed federal and local limits.
What repairs can fix the P0022 code?
- Resetting the fault codes and performing a road test
- Replacing the oil and filter using the proper oil viscosity for the engine
- Repairing or replacing the wiring or connection to the camshaft oil control valve (OCV)
- Replacing the camshaft oil control valve for the bank 2 intake camshaft
- Checking the timing chain alignment and cam phasers for damage
Additional comments for consideration regarding the P0022 code
- The camshaft phaser controls the timing advance and retard function with oil pressure using the Oil Control Valve. The oil needs to be of the proper viscosity for the camshaft timing control to work as designed.
Need help with a P0022 code?
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This article originally appeared on YourMechanic.com as P0022 OBD-II Trouble Code: Camshaft Position A - Timing Over-Retarded (Bank 2) and was authored by Jay Safford.