P0018 on GMC: How to Diagnose & Fix
Crankshaft/Camshaft Position Correlation - Bank 2 Sensor A
1 GMC model · 1 documented issue · 1 critical
P0018 on GMC by model: symptoms, diagnosis and fix
GM bulletin 12-06-01-009D covers 2007-2012 GMC Acadia vehicles with 3.6L High Feature V6 engines (RPO LY7 or LLT) and timing-chain correlation DTCs P0008, P0009, P0016, P0017, P0018 or P0019.
Common Symptoms
- Check-engine light
- Camshaft-to-crankshaft correlation DTC
How to Fix
Complete the GM diagnostic procedure before ordering parts. When a stretched timing chain is confirmed, use the applicable GM timing-chain kit. The bulletin says guides, sprockets, actuators and the crank gear should not be replaced automatically unless separately worn or diagnosed.
Sources for this issue (1)
P0018 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0018 mean on a GMC?
P0018 stands for "Crankshaft/Camshaft Position Correlation - Bank 2 Sensor A." This code means the computer detected that the crankshaft and the Bank 2 'A' (typically intake) camshaft are out of their expected timing relationship. The computer compares the crankshaft and camshaft position sensor signals; they should stay in a fixed correlation as the engine turns. When the Bank 2 camshaft is too far off from the crankshaft, P0018 sets, indicating the valve timing on that bank is misaligned. This can cause rough running, reduced power, hard starting, or a no-start, and in some cases signals timing chain or phaser trouble that warrants prompt attention. On GMC it is documented across 1 model: Acadia.
What are the most common causes of P0018?
The most common causes of P0018 are: Stretched, worn, or jumped timing chain (Bank 2), Worn or broken timing chain guides/tensioner, Stuck variable valve timing solenoid or phaser, Low or dirty engine oil affecting the phaser, Faulty crankshaft or camshaft position sensor, Damaged reluctor/tone ring, Incorrect timing from prior service, Wiring or connector fault at a cam/crank sensor. The specific cause varies by vehicle.
How much does it cost to fix P0018 on a GMC?
Repair costs vary widely with the root cause and GMC model; each issue on this page carries its own estimate where one is published.
Looking for P0018 on a different make?
View P0018 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.