P0327 on Chevrolet
Knock Sensor 1 Circuit Low Input (Bank 1)
P0327 on Chevrolet vehicles indicates knock sensor 1 circuit low input (bank 1). Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 1500. This code means the knock sensor on engine bank 1 sent a voltage signal that was lower than the expected range. The knock sensor is a small vibration microphone bolted to the engine block that listens for the 'pinging' of abnormal combustion (detonation), letting the computer retard ignition timing to protect the engine. A low-input reading usually points to an electrical problem — a fault in the sensor, its wiring, or connector — rather than actual knock. With the sensor compromised, the engine may run with safer, less efficient timing, causing slightly reduced power or fuel economy. Typical repair costs on Chevrolet range from $350 to $900, depending on the specific model and root cause.
Common Causes of P0327
- •Faulty knock sensor (Bank 1, Sensor 1)
- •Damaged, shorted-to-ground, or corroded sensor wiring
- •Loose or corroded sensor connector
- •Improperly torqued/loose sensor mounting
- •Open or high-resistance signal circuit
- •Wiring shielding or grounding problem
- •Faulty engine control module (PCM) — rare
P0327 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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View P0327 across all makes →Frequently Asked Questions
What does P0327 mean on Chevrolet?▼
P0327 stands for "Knock Sensor 1 Circuit Low Input (Bank 1)." This code means the knock sensor on engine bank 1 sent a voltage signal that was lower than the expected range. The knock sensor is a small vibration microphone bolted to the engine block that listens for the 'pinging' of abnormal combustion (detonation), letting the computer retard ignition timing to protect the engine. A low-input reading usually points to an electrical problem — a fault in the sensor, its wiring, or connector — rather than actual knock. With the sensor compromised, the engine may run with safer, less efficient timing, causing slightly reduced power or fuel economy. On Chevrolet specifically, this code is documented across 1 model.
What causes P0327 on Chevrolet vehicles?▼
Common causes on Chevrolet: Faulty knock sensor (Bank 1, Sensor 1), Damaged, shorted-to-ground, or corroded sensor wiring, Loose or corroded sensor connector, Improperly torqued/loose sensor mounting, Open or high-resistance signal circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0327 on a Chevrolet?▼
Repair costs on Chevrolet range from $350 to $900, depending on the specific model and root cause.
Which Chevrolet models have P0327 documented?▼
Au7o has documented P0327 on 1 Chevrolet model: Silverado 1500.