P0192 — Fuel Rail Pressure Sensor Circuit Low Input
P0192 sets when the FRP sensor signal voltage is below the calibrated minimum, typically a short to ground or failed sensor. Disconnect and short-isolation tests prevent unnecessary sensor replacement when the wiring is the actual cause.
Fault Overview
Short to ground on the signal wire, failed sensor with internal short, open ground, and wiring damage are the primary causes. Check for shorted signal wire to ground or shield. A signal voltage near zero almost always indicates a short to ground or failed sensor.
Engine & Platform Coverage
Symptoms
- •P0192
- •FRP sensor low voltage
- •fuel rail pressure circuit low
Possible Causes
- 1.Short to ground on signal wire
- 2.Failed sensor (internal short)
- 3.Open ground
- 4.Wiring damage
Wiring & Circuit Notes
Signal and ground circuits.
DVOM Specs & Sensor Tests
Signal voltage near zero. Disconnect test. Continuity and short-to-ground test.
Diagnostic Flow — FSM Sequence
AI Diesel Tech enforces this evidence-gate sequence. Each gate must pass before advancing.
3 steps locked behind Technician Mode- 1Step 1 — Measure Signal Voltage: Measure FRP sensor signal voltage at key-on. A reading near zero confirms a short to ground or failed sensor.
- 2Step 2 — Disconnect Sensor: Disconnect the sensor. If voltage rises to near 5 V, the sensor is shorted internally.
- 3Step 3 — Check for Short to Ground: With the sensor disconnected, measure resistance from the signal wire to ground. Any measurable resistance indicates a short.
- 4Step 4 — Inspect Wiring and Replace Sensor if Needed: Inspect wiring for damage and replace the sensor if the circuit is proven good.
Unlock the full evidence-gated diagnostic sequence, DVOM test steps, and repair procedures in Technician Mode.
Full Diagnostic Access
Verification steps, preventative measures, severity guidance, and legacy comparison are available in Technician Mode.
Typical Repair Costs
Repair short $80–250; replace sensor $80–350.
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Summary
Use the AI Diesel Tech diagnostic engine to run this code through a structured, evidence-gated sequence and get a confirmed root cause before any parts are replaced.