P0325 on a Chevy: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

You can drive, but the engine runs with reduced timing protection and fuel economy may drop, so have the knock sensor checked soon.

What P0325 means on a Chevy

On a Chevy, P0325 means the knock sensor on bank 1 is not sending a proper signal to the engine computer. The sensor detects engine knock so the computer can retard timing; without it, the engine can't protect itself from pinging.

Is P0325 common on Chevys?

P0325 is a well-known issue on Chevy trucks and SUVs with the V8 engines, especially Silverado and Tahoe-style platforms, and it also shows up on Equinox and Malibu models. On the V8s the knock sensors sit under the intake manifold and are prone to failure, often with a companion code for bank 2.

Commonly reported on: Silverado, Equinox, Malibu, Traverse.

Symptoms

Check engine light on
Reduced fuel economy
Engine pinging under load
Slight loss of power

Common causes

most common: Failed knock sensor
common: Chafed or damaged sensor wiring harness
common: Corroded or loose sensor connector
rare: Engine computer issue

How to fix it

Fix	DIY?	Typical cost
Replace the knock sensor	Mechanic	$200–500
Repair the wiring harness near the sensor	Mechanic	$100–300
Clean and reseat the sensor connector	Yes	$20–60

Frequently asked questions

Can I drive a Chevy with a P0325 code?

Yes, in most cases. The engine still runs, but without knock protection it may ping under load, and fuel economy can drop, so get it checked soon.

What usually causes P0325 on a Chevy?

A failed knock sensor, which is common on Chevy V8 trucks and SUVs. The sensors sit under the intake manifold, so they are exposed to heat and age poorly.

How much does it cost to fix P0325 on a Chevy?

Replacing a knock sensor typically runs $200–500 with parts and labor because the intake manifold has to come off. Wiring repairs are usually $100–300.