P0022

What the Code Means

Code P0022 indicates that the intake camshaft on bank 2 is over-retarded relative to its commanded position. This is typical of engines with dual VANOS and Valvetronic. Causes can include faulty VANOS solenoids, low oil pressure, or a stretched timing chain.

VANOS varies valve timing to optimize power, fuel economy, and emissions. When the intake camshaft is retarded, cylinder filling drops, which degrades engine operation.

Symptoms

• Engine: rough idle (misfire), power loss, poor throttle response
• Fuel economy: increased fuel consumption
• Indicators: Check Engine light (MIL) on

Symptoms may show up on a cold engine or during warm-up, and they can also appear under load.

Diagnosis and Repair

Step 1: Check Oil Level and Pressure

• Make sure the oil level is correct and the oil is the recommended viscosity (for example, Longlife-04).
• Measure oil pressure with a mechanical gauge — low pressure can delay VANOS response.

Step 2: Replace the VANOS Solenoids

• Read fault codes with ISTA or INPA.
• Check VANOS solenoid resistance (typically 6–12 ohms).
• If faulty, replace the solenoids on bank 2 (part number if available in the data).

Step 3: Check the Timing Chain

• Inspect the chain for stretch (check cam timing via ISTA).
• If stretched, replace the chain, the timing chain tensioner, and the chain guides.

Step 4: Reset Adaptations

• After repair, reset the VANOS adaptations with ISTA.

Common mistakes: replacing solenoids without checking oil pressure or the chain.

Secondary Damage

Ignoring code P0022 can lead to:

• Timing chain stretch: if the chain is the cause, continued driving risks chain failure, which causes catastrophic engine damage (valve-to-piston contact).
• Increased fuel consumption and emissions: from incorrect valve timing.
• Accelerated VANOS component wear: from constant operation outside its normal range.

See the code? Get it diagnosed now — a failed chain turns a solenoid job into an engine rebuild. Repair costs after a chain failure can reach several thousand dollars.