P0035 medium Severity

P0035: Turbocharger/Supercharger Bypass Valve Control Circuit High

May trigger MIL, reduced boost and performance; typically safe for short-term driving but should be diagnosed soon.

Overview

P0035 indicates a high signal/voltage condition detected in the turbocharger or supercharger bypass valve control circuit, often relating to boost control solenoid/wastegate valve issues, wiring faults, or PCM anomalies.

Common Symptoms

  • Check Engine Light (MIL) illuminated
  • Reduced boost or power loss
  • Vehicle may enter limp mode
  • Poor acceleration or performance

Most Common Causes

Faulty turbocharger bypass valve or wastegate solenoid high

Valve stuck or failed actuator causing high control signal.

Wiring harness issues (open, shorted, corroded) high

Damaged connectors, shorts to voltage or ground in control circuit.

Faulty PCM/ECM medium

Rare but possible; consider if all other tests pass.

Faulty boost pressure sensor medium

Incorrect sensor feedback can mimic bypass control circuit issues.

Diagnostic Steps

  1. Verify and read all stored DTCs with a quality OBD-II scanner.
    Expected: Confirm P0035 is current and note any related codes.
    Interpretation: Ensures correct identification of fault and contextual codes.
  2. Perform visual inspection of turbo bypass valve wiring and connectors.
    Expected: No broken wires, corrosion, or loose connectors.
    Interpretation: Faulty harness/connectors often cause high circuit signals.
  3. Test bypass valve/wastegate solenoid resistance and operation per OEM spec.
    Expected: Resistance within OEM range and proper activation.
    Interpretation: Confirms valve/solenoid integrity and correct control.
  4. Check boost pressure sensor readings with live data and compare with expected boost.
    Expected: Sensor readings align with actual boost.
    Interpretation: Faulty sensor can lead to incorrect ECM interpretations.
  5. If all else checks good, evaluate PCM control outputs and possible faults.
    Expected: PCM outputs within spec.
    Interpretation: Rare PCM faults may require replacement or reprogramming.

Repair Solutions

Replace faulty turbocharger bypass valve or wastegate solenoid medium
Estimated Cost: $200 - $800

Cost varies by vehicle model and labor; exact valve part needed.

Repair or replace damaged wiring/connectors medium
Estimated Cost: $50 - $300
Replace boost pressure sensor (if faulty) medium
Estimated Cost: $150 - $500
PCM repair/reflash or replacement hard
Estimated Cost: $500 - $1500

Consider only after exhaustive component and wiring tests.

Common Misdiagnoses

Avoid these common diagnostic mistakes:

  • Mistaking P0035 for O2 sensor heater circuit codes (e.g., P0135) due to similarity in numeric designation

Frequently Asked Questions

What is the definition of the P0035 engine code?

The P0035 code stands for Turbocharger/Supercharger Bypass Valve Control Circuit High. This generally indicates an issue with the Engine Mechanical system.

Is it safe to drive with a P0035 code?

You should treat P0035 as a medium issue. May trigger MIL, reduced boost and performance; typically safe for short-term driving but should be diagnosed soon.

What are the symptoms of P0035?

The most typical signs are: Check Engine Light (MIL) illuminated, Reduced boost or power loss, Vehicle may enter limp mode.

Why is my car throwing a P0035 code?

Potential culprits include: Faulty turbocharger bypass valve or wastegate solenoid, Wiring harness issues (open, shorted, corroded), Faulty PCM/ECM. A proper diagnosis is recommended.

Repair cost breakdown for P0035

It depends on what needs to be fixed. Repair or replace damaged wiring/connectors repairs are cheaper (~$300), while PCM repair/reflash or replacement repairs are on the higher end (~$1500).

Is P0035 a generic or manufacturer-specific code?

P0035 is not specific to any one brand. It can appear on Ford, Dodge, Toyota, Honda, Jeep, and other vehicles.

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