P0325 on Chevrolet
Knock Sensor 1 Circuit Malfunction (Bank 1)
P0325 on Chevrolet vehicles indicates knock sensor 1 circuit malfunction (bank 1). Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 1500. This code indicates a fault in the knock sensor 1 circuit on Bank 1. The knock sensor listens for the vibrations of detonation (pinging/spark knock) and lets the computer retard ignition timing to protect the engine. When the sensor's signal is missing, out of range, or the circuit is open/shorted, P0325 sets. With knock detection compromised, the computer may run more conservative timing, causing reduced power and slightly lower fuel economy, and the engine is less protected against damaging knock. Typical repair costs on Chevrolet range from $350 to $900, depending on the specific model and root cause.
Common Causes of P0325
- •Failed knock sensor
- •Corroded or loose knock sensor connector
- •Damaged, open, or shorted sensor wiring
- •Improperly torqued or loosely mounted sensor
- •Moisture or corrosion in the connector
- •Wiring harness chafing near the engine
- •Faulty PCM/ECM (rare)
P0325 on Chevrolet by Model
Chevrolet Silverado 1500(1 issue)
- Knock Sensor Water Intrusion Under Intake Causing Persistent Check Engine Light and Reduced Performance2000-2006
On 4.8L, 5.3L, and 6.0L GMT800 V8 trucks, the valley-mounted knock sensors and harness are prone to water intrusion from the cowl/intake area. Moisture corrodes the sensors or harness connectors, leading to false knock readings, a check engine light, and timing retard that can make the truck feel sluggish. This is one of the best-known early Silverado engine electrical issues and is heavily documented by owners and repair shops.
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What does P0325 mean on Chevrolet?▼
P0325 stands for "Knock Sensor 1 Circuit Malfunction (Bank 1)." This code indicates a fault in the knock sensor 1 circuit on Bank 1. The knock sensor listens for the vibrations of detonation (pinging/spark knock) and lets the computer retard ignition timing to protect the engine. When the sensor's signal is missing, out of range, or the circuit is open/shorted, P0325 sets. With knock detection compromised, the computer may run more conservative timing, causing reduced power and slightly lower fuel economy, and the engine is less protected against damaging knock. On Chevrolet specifically, this code is documented across 1 model.
What causes P0325 on Chevrolet vehicles?▼
Common causes on Chevrolet: Failed knock sensor, Corroded or loose knock sensor connector, Damaged, open, or shorted sensor wiring, Improperly torqued or loosely mounted sensor, Moisture or corrosion in the connector. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0325 on a Chevrolet?▼
Repair costs on Chevrolet range from $350 to $900, depending on the specific model and root cause.
Which Chevrolet models have P0325 documented?▼
Au7o has documented P0325 on 1 Chevrolet model: Silverado 1500.