Redundant Boost Pressure Sensor A
Boost pressure sensor A has a conflicting signal with another source.
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What it means (plain English)
There are two sensors measuring boost pressure, and they're sending different readings to the computer, causing confusion.
What the computer is actually seeing
The ECM sees inconsistent inputs from the primary boost pressure sensor and the redundant sensor, typically showing a difference greater than 5% in pressure readings or a significant offset in voltage (e.g. one sensor at 4.5V while the other is at 1.5V).
What a healthy reading looks like
Normal boost pressure should be around 15-30 psi during full acceleration; voltage outputs for correctly functioning sensors should be between 0.5V (no boost) and 4.5V (full boost).
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. Check for physical damage or signs of wear on the wiring and connectors between the sensors and the ECM. Repair or replace if necessary. Decision: Are the wires and connectors intact? Yes: proceed to step 2. No: repair wiring/connectors.
Common causes
- Faulty primary or redundant boost pressure sensor
- Faulty wiring or connectors between the sensors and the ECM
- ECM software issues or glitches
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's drivable, but boost performance may be compromised, leading to reduced power. Fix it soon.
Will the issue come back after fixing?
If the sensors or wiring are the cause and are properly repaired or replaced, it shouldn't return.
Why does this code pair with others?
It's common for multiple boost-related codes to appear together due to shared components or wiring issues.
Working a real vehicle right now?
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