P0046 Code- Turbocharger/Supercharger Boost Control 'A' Circuit Range/Performance

What Does Code P0046 Mean

This code has varied definitions as provided by the manufacturer. Generally, the Engine Control Unit (ECU) has detected an out of range reading in the turbocharger or supercharger boost control circuit. This code is related to circuit A and an area of the system circuit, as opposed to a particular malfunction or component.

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Possible symptoms

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

What causes the P0046 code?

• Vacuum leaks on the intake manifold
• A dirty, restrictive air cleaner
• The waste gate is either stuck open or closed
• A plugged or leaking intercooler
• Loose connections or a bad gasket between the exhaust manifold and the turbocharger
• Loose connection between the turbocharger and the inlet pipe
• A bad boost sensor
• Shorted or open wiring in the boost sensor circuit
• Loose, corroded, or disconnected electrical connectors in the boost sensor's 5-volt reference circuit
• Turbo failure from internal oil leaks and oil supply problems, causing bearing failure and blade damage

Troubleshooting P0046

A Range/Performance related code will be set when either a sensor or other component does not perform within the range the PCM (Powertrain Control Module) expects to see, given the current engine load/speed, and information gathered from other sensors. The possible causes of Range/Performance codes are likely to be defective sensors as easily as they are likely to be the result of wiring issues that affect the operation of the affected sensor or component, which means that with these codes, it is important to regard all sensors and components as part of the control circuit the code refers to.

I would begin my diagnosis with a careful visual inspection of all related wiring, connectors, components, and vacuum hoses. Repair or replace damaged, burnt, or disconnected parts as required. Also, check battery cable and battery post condition. Carefully rectify loose or corroded battery connectors and/or terminals before proceeding with your diagnosis.

Continue by noting all stored codes and freeze frame data before clearing all codes from the system. Clearing the codes may allow the turbocharger/supercharger boost control system to return to normal operating conditions if the PCM placed it in a failure or “limp-in” mode. It may also make you aware of an intermittent failure condition that will be much more difficult to diagnose than a “hard” failure.

After the codes have been cleared, obtain a manufacturer’s service manual (or equivilant) with a diagnostic flow chart for this code. You may carefully follw the steps of the flow chart but here a few basic tests that you may attempt:

Boost Control Solenoid

After obtaining specifications for the boost control solenoid, disconnect the solenoid electrical connector and use a digital volt/ohmmeter (DVOM) to check solenoid resistance levels. If solenoid resistance fails to comply with specs, replace it and retest the system. If solenoid resistance complies with the specs in the service manual, carefully apply battery voltage and a ground signal to the solenoid and listen for an audible “tick”. If the solenoid makes a sound, it is likely functioning properly. Check the passages of the solenoid for signs of obstruction and replace as necessary.

System Circuitry

If system wiring and connectors appear to be in proper working order, perform a circuit voltage and continuity test.

Test voltage at the boost control solenoid when it is commanded ON and compare your actual findings with manufacturer’s specifications. If the signal fails to comply, establish which of the signals (voltage or ground) are absent according to your particular vehicle specifications.

Prior to testing for individual system circuit continuity, disconnect the connector from the PCM and all related components to prevent possible damage. Use the DVOM to test continuity on each individual circuit and repair open (disconnected, cut, burnt, or disconnected) circuits and shorted (to ground or vehicle voltage) circuits as required.

PCM

While testing the PCM is not feesible, you may follow a process of elimination and remember that failure of this component is rare.

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