What Does P0192 Mean?
This code indicates the fuel rail pressure sensor circuit is not performing within its expected range. Similar to P0191, the ECM has detected that fuel rail pressure readings deviate significantly from what is commanded or expected. The sensor output may be sluggish, offset, or failing to respond proportionally to changes in fuel pump duty cycle and engine load.
Common Causes
35%
Fuel rail pressure sensor with degraded internal sensing element producing offset or sluggish readings
25%
Fuel pump losing capacity due to worn impeller, worn brushes, or clogged inlet strainer, unable to maintain commanded pressure
25%
Fuel pressure regulator not modulating correctly, causing pressure to be consistently offset from target
15%
Wiring issue in the sensor circuit causing voltage offset, such as a high-resistance connection or partial short
Diagnostic Steps
1
Step 1: Verify the fuel rail pressure sensor reading against a mechanical gauge. Record pressure at key-on engine-off, idle, 2000 RPM, and snap throttle. Differences greater than 5 PSI between gauge and sensor indicate sensor fault.
2
Step 2: Inspect the fuel pressure regulator vacuum line for cracks, disconnection, or fuel contamination (indicates ruptured diaphragm). With vacuum applied, pressure should decrease by 5-10 PSI.
3
Step 3: Check the sensor connector and wiring for corrosion, backed-out pins, or damaged insulation. Measure 5V reference, signal, and ground voltages at the sensor connector with key on engine off.
4
Step 4: Perform a fuel pump pressure and volume test. If pressure is low at the rail, check pump output before and after the filter to isolate restriction versus pump weakness.
5
Step 5: Replace the fuel rail pressure sensor if readings do not match mechanical gauge. Clear codes and verify proper operation across multiple drive cycles.
Estimated Repair Cost
$130 - $550
Parts + labor, varies by vehicle and location
This code indicates the fuel rail pressure sensor circuit is not performing within its expected range. Similar to P0191, the ECM has detected that fuel rail pressure readings deviate significantly from what is commanded or expected. The sensor output may be sluggish, offset, or failing to respond pr...
The most common cause of P0192 (Fuel Rail Pressure Sensor Circuit Range/Performance) is: Fuel rail pressure sensor with degraded internal sensing element producing offset or sluggish readings
Typical repair costs for P0192 range from $130 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Fuel delivery that does not match ECM expectations can cause lean misfires under load, potential stalling, and accelerated catalytic converter deterioration. Prompt diagnosis prevents engine damage from prolonged lean operation.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0192 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Delivery System
Difficulty
Type
Generic (SAE)
Recommended Tools
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