What Does P1319 Mean?
P1319 indicates that the knock sensor 1 circuit has a short to ground. The knock sensor produces a voltage signal when it detects engine detonation, and a short to ground pulls this signal low, making the ECM unable to detect knock events. The ECM will typically retard ignition timing as a protective measure, reducing performance and fuel economy.
Common Causes
30%
Damaged knock sensor 1 wiring shorted to engine block or ground
30%
Internal knock sensor 1 failure (piezoelectric element shorted)
20%
Water or oil contamination in the knock sensor connector
15%
Chafed wiring harness near the engine block or exhaust
5%
ECM knock sensor input circuit failure
Diagnostic Steps
1
Locate knock sensor 1 (typically on the engine block, Bank 1 side) and inspect the connector for oil, coolant, or water contamination.
2
Disconnect the knock sensor and measure resistance between the signal pin and engine ground — infinite resistance expected; any continuity indicates a sensor fault.
3
Check the wiring harness from the sensor to the ECM for insulation damage, especially where it passes near hot exhaust components or sharp edges.
4
Measure the sensor's internal resistance against manufacturer specs (typically 500k-5M ohms for piezoelectric type).
5
Clear codes, perform a test drive with aggressive acceleration to verify repair — monitor knock sensor PID for proper signal activity.
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
P1319 indicates that the knock sensor 1 circuit has a short to ground. The knock sensor produces a voltage signal when it detects engine detonation, and a short to ground pulls this signal low, making the ECM unable to detect knock events. The ECM will typically retard ignition timing as a protectiv...
The most common cause of P1319 (Knock Sensor 1 Circ. Short to Ground) is: Damaged knock sensor 1 wiring shorted to engine block or ground
Typical repair costs for P1319 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Without proper knock detection, the ECM defaults to conservative timing, reducing power. If the ECM fails to retard timing during actual detonation, severe engine damage (cracked pistons, damaged bearings) can result.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1319 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Knock Detection / Ignition Timing
Difficulty
Type
Manufacturer
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