Turbocharger Boost Control Position Sensor Performance
The Turbocharger boost control sensor is reporting a performance issue.
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)
The computer measures the position of the turbo control actuator, but the actual position doesn't match what it expects. This can happen if the sensor is faulty or the turbo's moving parts are sticking or broken.
What the computer is actually seeing
The Engine Control Module (ECM) receives a signal from the boost control sensor that indicates the position of the turbocharger's wastegate or actuator. If the position signal varies too much from expected values, the ECM triggers SPN 2691.
What a healthy reading looks like
The boost control position sensor should typically read voltages between 0.5V and 4.5V, corresponding to 0% to 100% actuator position.
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.
- 11. Inspect the wiring and connector at the boost control position sensor for damage or corrosion. If found, repair or replace as necessary.
- 22. Measure the voltage at the boost control position sensor with the key on, engine off. It should read between 0.5V and 4.5V.
- 3 - If voltage is out of range, replace the sensor.
- 43. Start the engine and monitor the sensor voltage as you rev the engine. It should change smoothly with engine RPM.
- 5 - If it does not change smoothly, replace the sensor.
- 64. Check the turbocharger actuator operation. Manually move the actuator to ensure it isn't stuck.
- 7 - If it's stuck, replace the turbocharged actuator.
Common causes
- Faulty boost control position sensor
- Wiring issues (frayed or shorted wires)
- Stuck or faulty turbocharger actuator
- Exhaust leaks before the turbo
- Incorrectly adjusted wastegate
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's best to fix this soon since it can lead to reduced power and efficiency.
Will this code come back after clearing?
If you fix the underlying issue, it shouldn't come back.
Why does this code sometimes pair with related boost or performance codes?
It often indicates a broader problem with the turbo system, so you may see multiple codes if there's a common failure.
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