📟
Check oil before parts - always. P0023 is the Bank 2 exhaust mirror of P0014. The variable valve timing system is oil-pressure driven, so dirty/low oil is the #1 trigger. Watch live cam-timing data with a Bluetooth OBD2 scanner to see if the cam stays advanced even when commanded back. See top-rated scanners on Amazon ↑
🗺️ Where Is the Problem?
Blueprint view - P0023 timing fault at the Bank 2 exhaust cam phaser/OCV (oil-pressure driven)
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0023 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
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🎯 Top Causes & Probability
60%
#1 - Most Likely
Low or Dirty Engine Oil / Sludge
The exhaust phaser on Bank 2 needs clean, full-pressure oil to release. Low oil, sludge in the head, or a clogged pickup screen makes the phaser stick advanced. Always change to fresh, correct-viscosity oil before any parts swap.
🔩 Part
$30–$80
👨🔧 Labor
$0–$60
⚡ DIY Difficulty
Easy
30%
#2 - Check First
Stuck Bank 2 Exhaust OCV
The oil control valve has gummed up with varnish or failed mechanically. Pull the solenoid, inspect the screen filter for debris, and bench-test for movement under 12V. Cleaning sometimes works; replacement is cheap insurance.
🔩 Part
$50–$180
👨🔧 Labor
$60–$140
⚡ DIY Difficulty
Easy–Medium
10%
#3 - Less Common
Worn Cam Phaser or Stretched Timing Chain (Bank 2)
If oil is clean and the OCV is good, the Bank 2 cam phaser's lock pin or the timing chain itself has worn out. Cold-start rattle is the giveaway. Significant labor - usually a shop job.
🔩 Part
$300–$1,200
👨🔧 Labor
$600–$2,000
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Check oil level & condition - Pull the dipstick. If oil is low, dark, or smells burnt, do a full oil change with the correct viscosity and a quality filter. Drive 50–100 miles - many P0023 codes never come back.
- Inspect & bench-test the Bank 2 exhaust OCV - Remove the exhaust OCV from the Bank 2 head. Inspect the screen filter for sludge or metal flake. Resistance should measure 6–12 ohms; apply 12V and listen/feel for a click.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need