Turbocharger/Supercharger Wastegate Position Sensor Circuit Low Voltage
The wastegate position sensor is reading a voltage that's too low.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
This code means the sensor that tells the engine computer how much the wastegate is opening isn't sending a strong enough signal, usually below 0.3 volts, which can cause boost control problems.
What the computer is actually seeing
The engine control module expects to see a voltage from the wastegate position sensor that varies between 0.5 and 4.5 volts under normal operation. Anything below 0.3 volts triggers this fault.
What a healthy reading looks like
Normal voltage range for the wastegate position sensor should be between 0.5 and 4.5 volts.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 1Inspect the wiring and connectors leading to the wastegate position sensor. Look for any signs of damage or corrosion.
- 2With the engine off, unplug the wastegate position sensor and check for any short circuits to ground. Expected resistance should be infinite (open circuit).
- 3Start the engine and use a scan tool to monitor the voltage of the wastegate position sensor. Confirm it is below 0.3 volts.
- 4If the sensor voltage is low at idle, back-probe the sensor connector and measure the reference voltage (should be around 5 volts). If it's not, trace back to the engine control module.
- 5If the reference voltage is good, replace the wastegate position sensor and recheck the voltage.
Common causes
- Faulty wastegate position sensor
- Wiring issues (frayed, shorted, or corroded wires)
- Connector problems (loose or corroded connectors)
- Turbocharger wastegate stuck in a closed position
- Faulty engine control module (rare)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but performance may be affected, and turbo function could be compromised.
Will this code reappear after clearing?
Yes, if the underlying issue isn't fixed, the code will likely come back.
Why does this code sometimes pair with SPN 2919?
Both codes involve boost control; SPN 2919 refers to the wastegate actuator itself, which could also malfunction.
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