DTC P0092 – Fuel Pressure Regulator Control Circuit High.
DTC P0092 — Fuel Pressure Regulator Control Circuit High.🔧
DTC P0092 – Fuel Pressure Regulator 1 Control Circuit High
Meaning
P0092 indicates that the ECM/PCM has detected higher-than-expected voltage in the control circuit of Fuel Pressure Regulator 1 (on high-pressure fuel systems).
This usually means:
The regulator is stuck closed
The control circuit is shorted to voltage
The ECM is commanding the regulator but not seeing expected response
🔍 Common Symptoms
Hard starting
High fuel pressure
Black smoke / rich mixture
Poor fuel economy
Rough idle
Engine hesitation
🔧 Possible Causes
Electrical
Short-to-power in regulator wiring
Damaged harness near engine or rail
Corroded or loose connector pins
Faulty fuel pressure regulator (electronic)
Faulty fuel rail pressure sensor (less common)
PCM driver fault (rare)
Mechanical
Fuel pressure regulator stuck closed
High-pressure pump overproducing pressure
🛠️ Step-by-Step Diagnostic (For Workshop Use)
1️⃣ Scan & Check Live Data
Check fuel rail pressure:
If pressure is too high, suspect regulator stuck or wiring short.
Compare:
Desired FRP vs Actual FRP
2️⃣ Inspect Wiring & Connectors
Focus on the fuel pressure regulator connector:
Look for oil contamination, corrosion, bent pins.
Check harness for rubbing against engine / metal edges.
Key check:
Unplug the regulator — if voltage remains high → wiring short to power.
3️⃣ Test Regulator Power & Ground
Using multimeter:
Check supply voltage → usually 5V or 12V depending on vehicle
Confirm solid ground
If ground is floating → circuit goes high.
4️⃣ Check Control Signal
Use multimeter or scope
If control line is always high → short to battery or PCM driver fault.
5️⃣ Test Fuel Pressure Regulator
If wiring is OK:
Replace the regulator (common failure)
On some systems it is integrated into the high-pressure pump.
6️⃣ Verify Fuel Rail Pressure Sensor
A faulty sensor can falsely show high readings but typically sets other codes.
🔧 Common Fixes
Repair wiring short-to-power
Replace damaged connector
Replace fuel pressure regulator
Clean/repair ground points
Replace high-pressure pump (if regulator built-in)
Rare: PCM replacement
📌 Tips for Fast Workshop Diagnosis
If you smell rich exhaust, suspect regulator stuck.
If problem appears after other engine work, check crushed wiring.
Always check for TSBs—many manufacturers have known issues with rail regulator wiring.
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