P0039 Code- Turbocharger Bypass Valve Control Circuit Range/Performance

What Does Code P0039 Mean

Please note that each manufacturer has a slightly different definition for this code as it relates to their particular system. The code generally means there is a problem with the bypass system for the turbo charger or supercharger to relieve pressure either completely or partially depending on how the system is designed. For this P0039 code, the boost pressure is out of range on boost pressure, which is normally 9 psi to 14 psi, for proper engine operation and power.

Symptoms may include poor engine acceleration, whining or rattling noises from the turbocharger or turbo pipes, abnormal smoke from the exhaust, spark plug fouling, excessive engine or transmission temperature, hissing noises from the turbocharger wastegate and/or hoses, and an overall lack of engine performance.

Additional codes may include other boost codes, engine misfire codes, or knock sensor codes. Cylinder detonation is another possibility if pressures or engine temperatures are too high. The boost pressure gauge (if so equipped) will exhibit abnormal levels of boost pressure.

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Possible symptoms

• Engine Light ON (or Service Engine Soon Warning Light)

What causes the P0039 code?

Several things can cause the Check Engine Light to come on and an OBD-II scanner to indicate this code.

• Sensor input voltage signals to the Engine Control Module (ECM) that indicate a boost pressure is out of the normal range specified by the manufacturer will cause a code to be stored and the Check Engine Light will come on. The ECU recognizes this incorrect data as an inability to effectively control boost levels.
• If the boost is more than 14 psi, it can indicate that pressure is not being sent through the bypass valve when it should to relieve pressure.
• If the boost pressure is too low, then there may be a loose or cracked hose, loose or missing hose clamp, leaking intercooler, or an excessive vacuum leak.
• The bypass valve is either stuck shut or not functioning properly.

Troubleshooting P0039

Because DTC P0039 describes a circuit problem, you’ll need a DMM (digital multimeter) and vehicle-specific EWD (electrical wiring diagram) to diagnose and repair it.

• Fuse & Wire Harness Check – The easiest thing to check is the fuse, if applicable. Then check the wire harness between the ECM and the BCS. Check for obvious damage or chafing. Check for bent or broken pins, corrosion, or evidence of water entry. Repair as needed and be sure all connectors are seated properly.

• BCS Check – Unplug the BCS and check for resistance across the terminals. Typical resistance should be between 10 Ω and 25 Ω, but check your repair manual to be sure. If there is an open circuit, ∞ Ω or OL on your DMM, or a short circuit, 0 Ω, replace the BCS.
• Circuit Check – Unplug the ECM and BCS. Check for continuity from end to end on each pin and check for short circuits between pins and to ground. There should be no resistance from the ECM to the BCS, and there should be infinite resistance, over 10 kΩ, to ground. Repair as necessary.

Searches related to P0039

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