P0016 on a GMC: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

You can often drive a GMC short distances with P0016, but if it runs rough, stalls, or won't start, stop driving — a jumped timing chain can cause major engine damage.

What P0016 means on a GMC

On a GMC, P0016 means the crankshaft and camshaft position sensors on bank 1 don't line up. GMC V8 engines use cam phasers and variable valve timing, so this code usually points to a stretched timing chain, a worn cam phaser, or low oil pressure. If the chain has jumped, the engine can be damaged.

Is P0016 common on GMCs?

P0016 is seen on GMC models like the Sierra and Yukon, as well as crossovers like the Terrain and Acadia. Timing chains, cam phasers, and oil pressure are the usual suspects, especially at higher mileage.

Commonly reported on: Sierra, Yukon, Terrain, Acadia.

Symptoms

Check engine light on
Rough idle or stalling
Hard starting in some cases
Loss of power or poor fuel economy

Common causes

most common: Stretched timing chain
common: Worn cam phaser
common: Low oil pressure
less common: Faulty camshaft position sensor
less common: Clogged oil passages

How to fix it

Fix	DIY?	Typical cost
Check the oil level and pressure	Yes	$30–80
Replace the timing chain kit if it is stretched	Mechanic	$1200–2500
Replace a worn cam phaser	Mechanic	$400–900
Replace a faulty camshaft position sensor	Yes	$100–250

Frequently asked questions

Can I keep driving my GMC with a P0016 code?

Short distances are usually okay if the engine runs fine. If it idles rough, stalls, or won't start, stop driving — a jumped timing chain can ruin the engine.

What causes P0016 on a GMC?

A stretched timing chain is the most common cause. A worn cam phaser, low oil pressure, or a bad camshaft position sensor can also set this code.

How much does it cost to fix P0016 on a GMC?

A timing chain job usually runs $1,200–$2,500. Replacing a cam phaser costs about $400–$900, and a camshaft sensor is around $100–$250.