P0022
A Camshaft Position - Timing Over-Retarded (Bank 2)
The appearance of the standard OBD2 trouble fault code P0022 is an indicator that your vehicle ECU triggered a threshold alert for "A Camshaft Position - Timing Over-Retarded (Bank 2)". Understanding the root component breakdown helps avoid expensive diagnostic fees.
Driver's Summary
P0022 is triggered when the PCM detects an abnormal condition associated with a camshaft position - timing over-retarded (bank 2). On the road, this usually shows up as rough running, sluggish acceleration, check engine light. While the car is usually drivable, you should schedule a diagnosis within the next few days to prevent the issue from worsening.
Symptoms
Rough running, sluggish acceleration, check engine light
Common Causes
- Sludge buildup restricting oil flow
- Failed variable valve timing actuator
- Skipped timing chain tooth
- Low engine oil pressure
How to Fix
- 1 Flush engine oil system
- 2 Replace VVT actuator
- 3 Verify engine timing alignment
- 4 Test oil pump pressure
Technical Explanation
The PCM triggers P0022 after its internal monitoring routine detects that a specific circuit or sensor has exceeded its acceptable operating range. The module measures the voltage return on the 5V reference circuit, comparing it to the expected signal envelope at current engine load and RPM. A deviation greater than the calibrated threshold — typically ±10% outside the normal operating window — flags the fault. After two failed drive cycles, the code transitions from a pending to a confirmed DTC, and the PCM activates the MIL. Clearing the code without repairing the fault will result in re-illumination within one to two complete drive cycles.
Is It Safe to Drive?
Code P0022 allows for cautious short-distance driving, but the underlying cause — most likely sludge buildup restricting oil flow — will worsen with time. Fuel economy suffers, and ignoring the fault for weeks can turn a $100 fix into a much larger repair bill.
Mechanic's Pro Tip
For P0022, test the solenoid's coil resistance with a multimeter before ordering parts — most solenoids should read between 14 and 40 ohms; an open (infinite resistance) or short (near zero) confirms it's failed electrically. Also verify the PCM is commanding the solenoid by backprobing the connector with a test light during the relevant operating condition — if there's no command signal, the fault is in the PCM or wiring, not the solenoid itself.
VVT Actuator: $200 - $500; Timing chain job: $1,000+