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Home / DTC / P0092 — Fuel Pressure Regulator A Control Circuit High

P0092 — Fuel Pressure Regulator A Control Circuit High

Detailed page for trouble code P0092.

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11,925generic
23,694specific
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P0092

Generic P — Powertrain

Fuel Pressure Regulator A Control Circuit High

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring harness to the fuel pressure regulator (broken conductor, chafing)
  • Short to battery voltage on the regulator control circuit (power feed short)
  • Poor, corroded or loose connector pins at regulator or PCM
  • Failed fuel pressure regulator / control solenoid
  • Faulty PCM (rare)
  • Aftermarket wiring or recent repairs with incorrect connections

Symptoms

  • Check Engine Light (MIL) illuminated
  • Engine hesitation, rough idle or reduced drivability
  • Hard starting or extended crank times
  • Poor fuel economy or inconsistent fuel pressure
  • Possible limp-home mode or reduced power on some vehicles

What to check

  • Read freeze frame and freeze PID data (fuel rail pressure, commanded regulator duty, engine load, RPM) to understand when fault set
  • Visual inspection of wiring and connectors at regulator and PCM for damage, corrosion, bent pins or water intrusion
  • Check related fuses and relays for power feed integrity
  • Backprobe regulator control pin and measure voltage with key ON and engine running while observing PCM command
  • Measure regulator coil resistance with connector disconnected (compare to OEM spec)
  • Wiggle test wiring while monitoring voltage / codes to reproduce intermittent faults

Signal parameters

  • Expected control circuit voltage when PCM commands regulator OFF: near battery voltage (approx. 11–14 V) or open/high, depending on design
  • Expected control circuit voltage when PCM commands regulator ON (active pull-down/ground): low — typically
  • Typical regulator coil resistance (generic): roughly 5–30 ohms — confirm OEM spec for exact value
  • PWM control: many systems use a variable duty-cycle PWM; frequency commonly in the tens to low hundreds of Hz (refer to OEM)
  • Compare measured voltages and duty cycle to PCM commanded duty from live data/oscilloscope

Diagnostic algorithm

  1. Record freeze-frame and current live PIDs (fuel rail pressure, commanded regulator duty, battery voltage, engine RPM).
  2. Perform a visual inspection of the fuel pressure regulator connector, harness and PCM connector. Repair obvious damage before further testing.
  3. With ignition ON (engine OFF), backprobe the regulator control wire and measure voltage. Note voltage with PCM not commanding and while commanding (if possible).
  4. Use a scan tool to command the regulator (if supported) while monitoring the control circuit voltage. If PCM commands ground but voltage remains high, suspect wiring short to B+ or failed PCM driver.
  5. Disconnect the regulator connector and measure coil resistance between regulator terminals. Compare to OEM spec. Infinite or very high resistance indicates open coil; near zero indicates short.
  6. If wiring looks OK and regulator resistance is correct, bench-test or substitute a known-good regulator to confirm behavior.
  7. If aftermarket repairs or harness splices are present, trace and repair incorrect connections or shorts to battery voltage.
  8. If wiring and the regulator check good but the control circuit still reads high only when PCM should be pulling low, test PCM output driver or consult OEM procedures; consider PCM replacement only after exhausting wiring and component checks.
  9. After repairs, clear DTCs and perform a road/functional test to confirm the fault does not return.
  10. Safety note: when working on fuel system components relieve fuel pressure per vehicle procedure and avoid open flames; disconnect battery if instructed by OEM when replacing electronic modules.

Likely causes

  • Corroded or pushed-out female terminal in the regulator connector causing intermittent high-voltage reading
  • Wire rubbed through and contacting a fused 12V source (short to B+)
  • Regulator internal leakage or shorted coil producing incorrect voltage signature
  • PCM output transistor failed high or internal pull-down/open circuit

Fault status

⚠️ Status
Fuel Pressure Regulator A Control Circuit High — control circuit voltage higher than expected (possible short to battery, open/poor connection, or failed regulator/PCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P0092

ISUZU P — Powertrain

Fuel Pressure Regulator Control Circuit High

Brand: ISUZU
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring harness to the fuel pressure regulator (broken conductor, chafing)
  • Short to battery voltage on the regulator control circuit (power feed short)
  • Poor, corroded or loose connector pins at regulator or PCM
  • Failed fuel pressure regulator / control solenoid
  • Faulty PCM (rare)
  • Aftermarket wiring or recent repairs with incorrect connections

Symptoms

  • Check Engine Light (MIL) illuminated
  • Engine hesitation, rough idle or reduced drivability
  • Hard starting or extended crank times
  • Poor fuel economy or inconsistent fuel pressure
  • Possible limp-home mode or reduced power on some vehicles

What to check

  • Read freeze frame and freeze PID data (fuel rail pressure, commanded regulator duty, engine load, RPM) to understand when fault set
  • Visual inspection of wiring and connectors at regulator and PCM for damage, corrosion, bent pins or water intrusion
  • Check related fuses and relays for power feed integrity
  • Backprobe regulator control pin and measure voltage with key ON and engine running while observing PCM command
  • Measure regulator coil resistance with connector disconnected (compare to OEM spec)
  • Wiggle test wiring while monitoring voltage / codes to reproduce intermittent faults

Signal parameters

  • Expected control circuit voltage when PCM commands regulator OFF: near battery voltage (approx. 11–14 V) or open/high, depending on design
  • Expected control circuit voltage when PCM commands regulator ON (active pull-down/ground): low — typically
  • Typical regulator coil resistance (generic): roughly 5–30 ohms — confirm OEM spec for exact value
  • PWM control: many systems use a variable duty-cycle PWM; frequency commonly in the tens to low hundreds of Hz (refer to OEM)
  • Compare measured voltages and duty cycle to PCM commanded duty from live data/oscilloscope

Diagnostic algorithm

  1. Record freeze-frame and current live PIDs (fuel rail pressure, commanded regulator duty, battery voltage, engine RPM).
  2. Perform a visual inspection of the fuel pressure regulator connector, harness and PCM connector. Repair obvious damage before further testing.
  3. With ignition ON (engine OFF), backprobe the regulator control wire and measure voltage. Note voltage with PCM not commanding and while commanding (if possible).
  4. Use a scan tool to command the regulator (if supported) while monitoring the control circuit voltage. If PCM commands ground but voltage remains high, suspect wiring short to B+ or failed PCM driver.
  5. Disconnect the regulator connector and measure coil resistance between regulator terminals. Compare to OEM spec. Infinite or very high resistance indicates open coil; near zero indicates short.
  6. If wiring looks OK and regulator resistance is correct, bench-test or substitute a known-good regulator to confirm behavior.
  7. If aftermarket repairs or harness splices are present, trace and repair incorrect connections or shorts to battery voltage.
  8. If wiring and the regulator check good but the control circuit still reads high only when PCM should be pulling low, test PCM output driver or consult OEM procedures; consider PCM replacement only after exhausting wiring and component checks.
  9. After repairs, clear DTCs and perform a road/functional test to confirm the fault does not return.
  10. Safety note: when working on fuel system components relieve fuel pressure per vehicle procedure and avoid open flames; disconnect battery if instructed by OEM when replacing electronic modules.

Likely causes

  • Corroded or pushed-out female terminal in the regulator connector causing intermittent high-voltage reading
  • Wire rubbed through and contacting a fused 12V source (short to B+)
  • Regulator internal leakage or shorted coil producing incorrect voltage signature
  • PCM output transistor failed high or internal pull-down/open circuit

Fault status

⚠️ Status
Fuel Pressure Regulator A Control Circuit High — control circuit voltage higher than expected (possible short to battery, open/poor connection, or failed regulator/PCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0090 P0091 P0093 P0191 P0193
Repair manuals

Manual library for ISUZU

229

Browse 229 ISUZU manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

ISUZU

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Code

P0092

LAND ROVER P — Powertrain

Fuel pressure regulator control - high circuit

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring harness to the fuel pressure regulator (broken conductor, chafing)
  • Short to battery voltage on the regulator control circuit (power feed short)
  • Poor, corroded or loose connector pins at regulator or PCM
  • Failed fuel pressure regulator / control solenoid
  • Faulty PCM (rare)
  • Aftermarket wiring or recent repairs with incorrect connections

Symptoms

  • Check Engine Light (MIL) illuminated
  • Engine hesitation, rough idle or reduced drivability
  • Hard starting or extended crank times
  • Poor fuel economy or inconsistent fuel pressure
  • Possible limp-home mode or reduced power on some vehicles

What to check

  • Read freeze frame and freeze PID data (fuel rail pressure, commanded regulator duty, engine load, RPM) to understand when fault set
  • Visual inspection of wiring and connectors at regulator and PCM for damage, corrosion, bent pins or water intrusion
  • Check related fuses and relays for power feed integrity
  • Backprobe regulator control pin and measure voltage with key ON and engine running while observing PCM command
  • Measure regulator coil resistance with connector disconnected (compare to OEM spec)
  • Wiggle test wiring while monitoring voltage / codes to reproduce intermittent faults

Signal parameters

  • Expected control circuit voltage when PCM commands regulator OFF: near battery voltage (approx. 11–14 V) or open/high, depending on design
  • Expected control circuit voltage when PCM commands regulator ON (active pull-down/ground): low — typically
  • Typical regulator coil resistance (generic): roughly 5–30 ohms — confirm OEM spec for exact value
  • PWM control: many systems use a variable duty-cycle PWM; frequency commonly in the tens to low hundreds of Hz (refer to OEM)
  • Compare measured voltages and duty cycle to PCM commanded duty from live data/oscilloscope

Diagnostic algorithm

  1. Record freeze-frame and current live PIDs (fuel rail pressure, commanded regulator duty, battery voltage, engine RPM).
  2. Perform a visual inspection of the fuel pressure regulator connector, harness and PCM connector. Repair obvious damage before further testing.
  3. With ignition ON (engine OFF), backprobe the regulator control wire and measure voltage. Note voltage with PCM not commanding and while commanding (if possible).
  4. Use a scan tool to command the regulator (if supported) while monitoring the control circuit voltage. If PCM commands ground but voltage remains high, suspect wiring short to B+ or failed PCM driver.
  5. Disconnect the regulator connector and measure coil resistance between regulator terminals. Compare to OEM spec. Infinite or very high resistance indicates open coil; near zero indicates short.
  6. If wiring looks OK and regulator resistance is correct, bench-test or substitute a known-good regulator to confirm behavior.
  7. If aftermarket repairs or harness splices are present, trace and repair incorrect connections or shorts to battery voltage.
  8. If wiring and the regulator check good but the control circuit still reads high only when PCM should be pulling low, test PCM output driver or consult OEM procedures; consider PCM replacement only after exhausting wiring and component checks.
  9. After repairs, clear DTCs and perform a road/functional test to confirm the fault does not return.
  10. Safety note: when working on fuel system components relieve fuel pressure per vehicle procedure and avoid open flames; disconnect battery if instructed by OEM when replacing electronic modules.

Likely causes

  • Corroded or pushed-out female terminal in the regulator connector causing intermittent high-voltage reading
  • Wire rubbed through and contacting a fused 12V source (short to B+)
  • Regulator internal leakage or shorted coil producing incorrect voltage signature
  • PCM output transistor failed high or internal pull-down/open circuit

Fault status

⚠️ Status
Fuel Pressure Regulator A Control Circuit High — control circuit voltage higher than expected (possible short to battery, open/poor connection, or failed regulator/PCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0090 P0091 P0093 P0191 P0193
413

Browse 413 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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Code

P0092

VOLKSWAGEN P — Powertrain

Fuel Pressure Regulator 2 Performance

Brand: VOLKSWAGEN
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or damaged wiring harness to the fuel pressure regulator (broken conductor, chafing)
  • Short to battery voltage on the regulator control circuit (power feed short)
  • Poor, corroded or loose connector pins at regulator or PCM
  • Failed fuel pressure regulator / control solenoid
  • Faulty PCM (rare)
  • Aftermarket wiring or recent repairs with incorrect connections

Symptoms

  • Check Engine Light (MIL) illuminated
  • Engine hesitation, rough idle or reduced drivability
  • Hard starting or extended crank times
  • Poor fuel economy or inconsistent fuel pressure
  • Possible limp-home mode or reduced power on some vehicles

What to check

  • Read freeze frame and freeze PID data (fuel rail pressure, commanded regulator duty, engine load, RPM) to understand when fault set
  • Visual inspection of wiring and connectors at regulator and PCM for damage, corrosion, bent pins or water intrusion
  • Check related fuses and relays for power feed integrity
  • Backprobe regulator control pin and measure voltage with key ON and engine running while observing PCM command
  • Measure regulator coil resistance with connector disconnected (compare to OEM spec)
  • Wiggle test wiring while monitoring voltage / codes to reproduce intermittent faults

Signal parameters

  • Expected control circuit voltage when PCM commands regulator OFF: near battery voltage (approx. 11–14 V) or open/high, depending on design
  • Expected control circuit voltage when PCM commands regulator ON (active pull-down/ground): low — typically
  • Typical regulator coil resistance (generic): roughly 5–30 ohms — confirm OEM spec for exact value
  • PWM control: many systems use a variable duty-cycle PWM; frequency commonly in the tens to low hundreds of Hz (refer to OEM)
  • Compare measured voltages and duty cycle to PCM commanded duty from live data/oscilloscope

Diagnostic algorithm

  1. Record freeze-frame and current live PIDs (fuel rail pressure, commanded regulator duty, battery voltage, engine RPM).
  2. Perform a visual inspection of the fuel pressure regulator connector, harness and PCM connector. Repair obvious damage before further testing.
  3. With ignition ON (engine OFF), backprobe the regulator control wire and measure voltage. Note voltage with PCM not commanding and while commanding (if possible).
  4. Use a scan tool to command the regulator (if supported) while monitoring the control circuit voltage. If PCM commands ground but voltage remains high, suspect wiring short to B+ or failed PCM driver.
  5. Disconnect the regulator connector and measure coil resistance between regulator terminals. Compare to OEM spec. Infinite or very high resistance indicates open coil; near zero indicates short.
  6. If wiring looks OK and regulator resistance is correct, bench-test or substitute a known-good regulator to confirm behavior.
  7. If aftermarket repairs or harness splices are present, trace and repair incorrect connections or shorts to battery voltage.
  8. If wiring and the regulator check good but the control circuit still reads high only when PCM should be pulling low, test PCM output driver or consult OEM procedures; consider PCM replacement only after exhausting wiring and component checks.
  9. After repairs, clear DTCs and perform a road/functional test to confirm the fault does not return.
  10. Safety note: when working on fuel system components relieve fuel pressure per vehicle procedure and avoid open flames; disconnect battery if instructed by OEM when replacing electronic modules.

Likely causes

  • Corroded or pushed-out female terminal in the regulator connector causing intermittent high-voltage reading
  • Wire rubbed through and contacting a fused 12V source (short to B+)
  • Regulator internal leakage or shorted coil producing incorrect voltage signature
  • PCM output transistor failed high or internal pull-down/open circuit

Fault status

⚠️ Status
Fuel Pressure Regulator A Control Circuit High — control circuit voltage higher than expected (possible short to battery, open/poor connection, or failed regulator/PCM).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0090 P0091 P0093 P0191 P0193
626

Browse 626 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

VOLKSWAGEN

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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