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Home / DTC / P0033 — Turbocharger/Supercharger Bypass Valve A Control Circuit

P0033 — Turbocharger/Supercharger Bypass Valve A Control Circuit

Detailed page for trouble code P0033.

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Code

P0033

Generic P — Powertrain

Turbocharger/Supercharger Bypass Valve A Control Circuit

Brand: Generic
Type: P — Powertrain
Views: UK: 26 EN: 74 RU: 53
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring in the bypass valve control circuit
  • Corroded or loose connector at the bypass valve solenoid
  • Failed bypass valve solenoid (stuck or electrically open/shorted)
  • Poor ground or power supply to the solenoid
  • Blocked or disconnected vacuum/boost control hose (if vacuum actuated)
  • Intermittent connection (broken wire, chafing)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power, poor acceleration or limp mode
  • Erratic or incorrect boost pressure (overboost or underboost)
  • Hissing or unusual boost noises
  • Possible turbo surge or delayed boost response

What to check

  • Read stored freeze frame and pending codes; note conditions when code set
  • Inspect wiring and connector at bypass valve for damage, corrosion or loose pins
  • Use a scan tool to command the bypass valve and observe commanded state vs actual
  • Backprobe connector: measure supply voltage and ground while commanding actuator
  • Measure coil resistance of bypass valve solenoid (compare to spec)
  • Wiggle test wiring while monitoring signal for intermittent faults

Signal parameters

  • Typical solenoid coil resistance: commonly 20–100 ohms (varies by vehicle) — consult OEM spec
  • Control signal behavior: many systems are PCM-grounded; when commanded ON the ECM grounds the circuit (voltage at connector may drop toward 0–1 V), when OFF it is near battery voltage (~12 V) or open
  • If system is high-side switched, commanded ON may apply battery voltage to solenoid — check vehicle wiring diagram
  • Expected response: voltage/ground state changes when commanded by scan tool; no open-circuit or short-to-B+/-GND

Diagnostic algorithm

  1. Verify the code and note freeze-frame data. Clear codes and attempt to re-create under same operating conditions.
  2. Visually inspect the bypass valve, solenoid, vacuum/boost hoses, harness and connectors for damage, corrosion, rodent chew or loose pins.
  3. Using a scan tool, command the bypass valve ON/OFF while watching live data and listening for valve operation. Note any lack of response or incorrect state.
  4. With ignition ON (engine off) backprobe the solenoid connector. Check for correct supply voltage and ground reference per wiring diagram. If supply or ground missing, trace upstream (fuse, relay, harness).
  5. Measure solenoid coil resistance with connector disconnected. Compare to manufacturer spec. Infinite or very high resistance = open coil; near zero ohms = short.
  6. If coil resistance is within spec, apply appropriate bench voltage (battery voltage or per spec) briefly to the solenoid to confirm it actuates (observe valve movement or listen for click). Use caution and avoid continuous application.
  7. Perform a wiggle test on wiring/connectors while commanding the valve to check for intermittent faults. Repair any damaged wiring or corroded connectors.
  8. Inspect and test vacuum/boost hoses and the mechanical bypass/wastegate for sticking or blockage. Replace or clean as required.
  9. If wiring, connector and solenoid test good, verify ECM drive output using an oscilloscope or multimeter under dynamic conditions. If ECM drive is missing or erratic and wiring is good, consider ECM fault and consult manufacturer service information before replacement.
  10. After repairs, clear codes and perform a road test to confirm proper operation and that the code does not return.

Likely causes

  • Damaged harness or connector to bypass valve
  • Failed solenoid coil (electrical failure)
  • Short to battery or short to ground at solenoid connector
  • Stuck bypass valve or mechanical binding preventing expected feedback
  • Blown fuse or relay feeding the circuit

Fault status

⚠️ Status
P0033 — Turbocharger/Supercharger Bypass Valve A Control Circuit. The ECM detected an electrical fault in the bypass valve control circuit (open, short, or incorrect signal) or a lack of expected actuation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0030 P0031 P0032 P0234 P0299 P2263
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Code

P0033

LAND ROVER P — Powertrain

Turbocharger/Supercharger Bypass Valve Control - open circuit

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 10 EN: 18 RU: 20
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring in the bypass valve control circuit
  • Corroded or loose connector at the bypass valve solenoid
  • Failed bypass valve solenoid (stuck or electrically open/shorted)
  • Poor ground or power supply to the solenoid
  • Blocked or disconnected vacuum/boost control hose (if vacuum actuated)
  • Intermittent connection (broken wire, chafing)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power, poor acceleration or limp mode
  • Erratic or incorrect boost pressure (overboost or underboost)
  • Hissing or unusual boost noises
  • Possible turbo surge or delayed boost response

What to check

  • Read stored freeze frame and pending codes; note conditions when code set
  • Inspect wiring and connector at bypass valve for damage, corrosion or loose pins
  • Use a scan tool to command the bypass valve and observe commanded state vs actual
  • Backprobe connector: measure supply voltage and ground while commanding actuator
  • Measure coil resistance of bypass valve solenoid (compare to spec)
  • Wiggle test wiring while monitoring signal for intermittent faults

Signal parameters

  • Typical solenoid coil resistance: commonly 20–100 ohms (varies by vehicle) — consult OEM spec
  • Control signal behavior: many systems are PCM-grounded; when commanded ON the ECM grounds the circuit (voltage at connector may drop toward 0–1 V), when OFF it is near battery voltage (~12 V) or open
  • If system is high-side switched, commanded ON may apply battery voltage to solenoid — check vehicle wiring diagram
  • Expected response: voltage/ground state changes when commanded by scan tool; no open-circuit or short-to-B+/-GND

Diagnostic algorithm

  1. Verify the code and note freeze-frame data. Clear codes and attempt to re-create under same operating conditions.
  2. Visually inspect the bypass valve, solenoid, vacuum/boost hoses, harness and connectors for damage, corrosion, rodent chew or loose pins.
  3. Using a scan tool, command the bypass valve ON/OFF while watching live data and listening for valve operation. Note any lack of response or incorrect state.
  4. With ignition ON (engine off) backprobe the solenoid connector. Check for correct supply voltage and ground reference per wiring diagram. If supply or ground missing, trace upstream (fuse, relay, harness).
  5. Measure solenoid coil resistance with connector disconnected. Compare to manufacturer spec. Infinite or very high resistance = open coil; near zero ohms = short.
  6. If coil resistance is within spec, apply appropriate bench voltage (battery voltage or per spec) briefly to the solenoid to confirm it actuates (observe valve movement or listen for click). Use caution and avoid continuous application.
  7. Perform a wiggle test on wiring/connectors while commanding the valve to check for intermittent faults. Repair any damaged wiring or corroded connectors.
  8. Inspect and test vacuum/boost hoses and the mechanical bypass/wastegate for sticking or blockage. Replace or clean as required.
  9. If wiring, connector and solenoid test good, verify ECM drive output using an oscilloscope or multimeter under dynamic conditions. If ECM drive is missing or erratic and wiring is good, consider ECM fault and consult manufacturer service information before replacement.
  10. After repairs, clear codes and perform a road test to confirm proper operation and that the code does not return.

Likely causes

  • Damaged harness or connector to bypass valve
  • Failed solenoid coil (electrical failure)
  • Short to battery or short to ground at solenoid connector
  • Stuck bypass valve or mechanical binding preventing expected feedback
  • Blown fuse or relay feeding the circuit

Fault status

⚠️ Status
P0033 — Turbocharger/Supercharger Bypass Valve A Control Circuit. The ECM detected an electrical fault in the bypass valve control circuit (open, short, or incorrect signal) or a lack of expected actuation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0030 P0031 P0032 P0234 P0299 P2263
Workshop Manuals

Repair manuals for LAND ROVER

3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
Download

Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Download

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Download
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0033

MITSUBISHI P — Powertrain

Waste gate system

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 13 EN: 21 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring in the bypass valve control circuit
  • Corroded or loose connector at the bypass valve solenoid
  • Failed bypass valve solenoid (stuck or electrically open/shorted)
  • Poor ground or power supply to the solenoid
  • Blocked or disconnected vacuum/boost control hose (if vacuum actuated)
  • Intermittent connection (broken wire, chafing)

Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced engine power, poor acceleration or limp mode
  • Erratic or incorrect boost pressure (overboost or underboost)
  • Hissing or unusual boost noises
  • Possible turbo surge or delayed boost response

What to check

  • Read stored freeze frame and pending codes; note conditions when code set
  • Inspect wiring and connector at bypass valve for damage, corrosion or loose pins
  • Use a scan tool to command the bypass valve and observe commanded state vs actual
  • Backprobe connector: measure supply voltage and ground while commanding actuator
  • Measure coil resistance of bypass valve solenoid (compare to spec)
  • Wiggle test wiring while monitoring signal for intermittent faults

Signal parameters

  • Typical solenoid coil resistance: commonly 20–100 ohms (varies by vehicle) — consult OEM spec
  • Control signal behavior: many systems are PCM-grounded; when commanded ON the ECM grounds the circuit (voltage at connector may drop toward 0–1 V), when OFF it is near battery voltage (~12 V) or open
  • If system is high-side switched, commanded ON may apply battery voltage to solenoid — check vehicle wiring diagram
  • Expected response: voltage/ground state changes when commanded by scan tool; no open-circuit or short-to-B+/-GND

Diagnostic algorithm

  1. Verify the code and note freeze-frame data. Clear codes and attempt to re-create under same operating conditions.
  2. Visually inspect the bypass valve, solenoid, vacuum/boost hoses, harness and connectors for damage, corrosion, rodent chew or loose pins.
  3. Using a scan tool, command the bypass valve ON/OFF while watching live data and listening for valve operation. Note any lack of response or incorrect state.
  4. With ignition ON (engine off) backprobe the solenoid connector. Check for correct supply voltage and ground reference per wiring diagram. If supply or ground missing, trace upstream (fuse, relay, harness).
  5. Measure solenoid coil resistance with connector disconnected. Compare to manufacturer spec. Infinite or very high resistance = open coil; near zero ohms = short.
  6. If coil resistance is within spec, apply appropriate bench voltage (battery voltage or per spec) briefly to the solenoid to confirm it actuates (observe valve movement or listen for click). Use caution and avoid continuous application.
  7. Perform a wiggle test on wiring/connectors while commanding the valve to check for intermittent faults. Repair any damaged wiring or corroded connectors.
  8. Inspect and test vacuum/boost hoses and the mechanical bypass/wastegate for sticking or blockage. Replace or clean as required.
  9. If wiring, connector and solenoid test good, verify ECM drive output using an oscilloscope or multimeter under dynamic conditions. If ECM drive is missing or erratic and wiring is good, consider ECM fault and consult manufacturer service information before replacement.
  10. After repairs, clear codes and perform a road test to confirm proper operation and that the code does not return.

Likely causes

  • Damaged harness or connector to bypass valve
  • Failed solenoid coil (electrical failure)
  • Short to battery or short to ground at solenoid connector
  • Stuck bypass valve or mechanical binding preventing expected feedback
  • Blown fuse or relay feeding the circuit

Fault status

⚠️ Status
P0033 — Turbocharger/Supercharger Bypass Valve A Control Circuit. The ECM detected an electrical fault in the bypass valve control circuit (open, short, or incorrect signal) or a lack of expected actuation.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0030 P0031 P0032 P0234 P0299 P2263
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