If your Check Engine Light is glowing and your vehicle is suffering from a rough idle, hard starting, or poor acceleration, you might pull DTC P0017. This is one of the most dreaded codes in the automotive world—especially for owners of GM 3.6L V6s, Chevy Ecotec 2.4Ls, and various VW/Audi models.
The code means the Engine Control Module (ECM) has detected that the rotation of the crankshaft and the exhaust camshaft on Bank 1 are out of alignment. Before you panic and assume you need a $2,000 timing chain replacement, read this guide. Often, the culprit is something as simple as dirty engine oil or a $40 VVT solenoid.
⚡ Quick Reference: P0017 DTC
| Field | Details |
|---|---|
| Definition | Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor B) |
| Severity | HIGH — Risk of internal engine damage if the timing chain jumps |
| Affected Vehicles | Highly common on GM (Chevy Equinox/Traverse, GMC Acadia), Ford, VW/Audi, and Hyundai/Kia. |
| Most Common Cause | Low/dirty engine oil, clogged VVT solenoid, or a stretched timing chain. |
| Sensor Location | "Sensor B" refers to the Exhaust Camshaft. "Bank 1" is the side of the engine with Cylinder 1. |
| Related Codes | P0008, P0009, P0016, P0018, P0019 |
| Diagnostic Tool | iCarsoft CR Eagle P (Required to view live camshaft variance angles) |
How to Fix Code P0017: What It Actually Means
To maximize fuel economy and power, modern engines use Variable Valve Timing (VVT). This system uses engine oil pressure to actively rotate the camshafts, advancing or retarding the timing of the valves while the engine is running.
The ECM monitors this entire process using two main types of sensors: the Crankshaft Position Sensor (CKP) (which measures the bottom half of the engine) and the Camshaft Position Sensors (CMP) (which measure the top half). The ECM expects these sensors to pass each other at very specific, synchronized intervals.
When you get a P0017, the ECM is saying: "I commanded the Bank 1 Exhaust Camshaft to be at a specific angle, but according to the sensors, it's out of position relative to the crankshaft."
Common Symptoms of P0017
- Check Engine Light (MIL) — Usually comes on immediately.
- Hard Starting or Extended Cranking — The engine takes longer to fire up because the timing is off.
- Rattling Noise on Startup — A brief 1‑2 second rattle when starting the engine is a classic sign of a failing timing chain tensioner or stretched chain.
- Rough Idle and Stalling — The engine may shake or stall at stoplights.
- Reduced Engine Power — The ECM will disable the VVT system (failsafe mode), reducing acceleration.
- Poor Fuel Economy — Without VVT, engine efficiency drops significantly.
Customer towed in their Equinox with a P0017 code, rough idle, and stalling. Another shop had quoted $1,800 for a timing chain replacement. We checked the oil—it was nearly 2 quarts low and incredibly dark. Using the iCarsoft CR Eagle P, we commanded the exhaust VVT solenoid, but the cam angle didn't change.
"We pulled the exhaust VVT solenoid (actuator) on Bank 1. The micro‑screens were completely clogged with oil sludge. We cleaned the engine, replaced the $45 solenoid, did an oil change, and the cam variance went back to 0 degrees. Saved the customer $1,700."
Root Causes — Check These Before Replacing the Chain
① Low, Dirty, or Wrong Viscosity Engine Oil (Always check first)
The VVT system is entirely dependent on oil pressure. If your oil level is low, or if sludge has formed from missed oil changes, the VVT phasers cannot lock the camshafts into the correct position. An oil change is step one.
② Clogged/Faulty Exhaust VVT Solenoid (Oil Control Valve)
The VVT solenoid directs oil into the camshaft phaser. The screens on these solenoids easily clog with debris. If the exhaust solenoid on Bank 1 sticks open or closed, the camshaft will be pushed out of sync, triggering P0017. Replacing this is cheap and often solves the issue.
③ Stretched Timing Chain or Worn Tensioners (The expensive fix)
Over time, the pins in a timing chain wear down, causing the chain to "stretch." When it stretches too far, the camshaft lags behind the crankshaft. This is a massive, known issue on GM 3.6L V6 engines (generating codes P0008 and P0017). A metallic rattle on startup usually accompanies this.
④ Faulty Camshaft/Crankshaft Position Sensor (Rare)
While rare for a correlation code, a damaged tone ring, magnetic interference, or a dying sensor sending an erratic signal *can* trick the ECM into thinking the timing is off.
Decoding VVT Codes: P0016, P0017, P0018, P0019
If you have a V6 or V8, you have multiple camshafts. Make sure you are diagnosing the correct one:
| Code | Bank | Camshaft (Sensor) | Location Hint |
|---|---|---|---|
| P0016 | Bank 1 | Sensor A (Intake) | Side of engine with Cyl 1 / Intake side |
| P0017 | Bank 1 | Sensor B (Exhaust) | Side of engine with Cyl 1 / Exhaust side |
| P0018 | Bank 2 | Sensor A (Intake) | Opposite side of Cyl 1 / Intake side |
| P0019 | Bank 2 | Sensor B (Exhaust) | Opposite side of Cyl 1 / Exhaust side |
🛠 DIY Diagnostic Checklist
To correctly diagnose P0017 without wasting money on unneeded parts, you need:
Step‑by‑Step Diagnosis & Repair
Check Oil Level and Condition
Pull the dipstick. If the oil is not touching the hash marks, or if it looks like thick black molasses, stop right here. Do a complete oil and filter change. Clear the P0017 code and drive the vehicle. If the code stays away, your VVT system was simply starved of hydraulic pressure.
Inspect the Bank 1 Exhaust VVT Solenoid
Locate the Bank 1 Exhaust VVT Solenoid (usually protruding from the top of the valve cover). Unbolt it (usually a 10 mm bolt) and pull it out. Look at the fine wire mesh screens. Are they caked with metal shavings or sludge? If so, clean them thoroughly with brake cleaner, or replace the solenoid entirely (they cost around $30‑$60).
Check Live Camshaft Data (The Pro Method)
Plug in a professional scanner. Go to Engine Data and find the PID for "Camshaft Position Variance" or "Desired vs Actual Cam Angle." Rev the engine. If the Desired angle changes but the Actual angle stays stuck, your VVT solenoid/phaser is stuck. If the Actual angle is permanently 5‑10+ degrees off from 0 at idle, your timing chain has likely stretched.
→ CR Eagle P streams live Camshaft/Crankshaft Sync dataInspect the Sensor and Wiring
Check the wiring harness going to Bank 1 Sensor B. Look for melted wires near the exhaust manifold. Pull the sensor out and wipe off the magnetic tip. If the sensor is covered in heavy metal shavings, you have severe internal engine wear.
Mechanical Timing Check (Last Resort)
If the oil is fresh, the solenoids are new, and the sensors test good, you must check mechanical timing. This involves removing the valve cover and aligning the engine to Top Dead Center (TDC). If the timing marks on the camshaft sprockets do not line up perfectly with the colored links on the chain, the chain is stretched and must be replaced.
Don't Guess on Engine Timing. Use iCarsoft CR Eagle P.
A generic code reader will only tell you "P0017." It won't tell you if your chain is stretched by 2° or 15°. The CR Eagle P allows you to view the live variance data that dealerships use to condemn a timing chain vs. a cheap solenoid.
- Stream live Camshaft/Crankshaft alignment PIDs (Desired vs. Actual)
- Bi‑directional control: Command VVT solenoids ON/OFF to test them instantly
- Read & clear deep‑level OEM powertrain codes
- Covers GM, Ford, VW, Toyota, Hyundai, and more
- Free lifetime software updates included
Estimated Repair Costs
| Repair | Parts | Labor | Total (Shop) | DIY Total |
|---|---|---|---|---|
| Engine oil & filter service | $40–60 | $30–50 | $70–110 | $40–60 |
| Replace VVT Solenoid (Oil Control Valve) | $40–80 | $50–100 | $90–180 | $40–80 |
| Replace Camshaft Position Sensor | $30–70 | $60–100 | $90–170 | $30–70 |
| Replace Timing Chain & Tensioners | $250–600 | $800–1,800 | $1,050–2,400 | Advanced DIY only |
Related Fault Codes
If you see any of these codes alongside P0017, treat it as a system‑wide timing or oil‑pressure issue:
Frequently Asked Questions
Can I still drive with code P0017?
Which camshaft is Sensor B on Bank 1?
Does P0017 mean I need a new timing chain?
Will replacing the camshaft sensor fix P0017?
References
- SAE J2012 — Diagnostic Trouble Code Definitions
- GM Technical Service Bulletin (TSB) 12‑06‑01‑009 — Information on P0008, P0009, P0016, P0017 (Timing Chain Wear)
Always verify specifications against the OEM service manual for your specific vehicle and model year. Professional diagnosis is recommended for internal engine timing repairs.
Was it just a dirty solenoid or did you have to replace the timing chain? Share your vehicle make, mileage, and repair story in the comments below! 👇