Brake Pedal Position Sensor Voltage
The brake pedal position sensor voltage is out of the expected range.
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 brake pedal position sensor lets the engine know how far down you've pressed the brake. If it reads too low or too high, it can confuse the engine's control system.
What the computer is actually seeing
The engine control module (ECM) expects to see a voltage signal from the brake pedal position sensor between 0.5V (not pressed) and 4.5V (fully pressed). If the voltage falls outside this range, it triggers the fault code SPN 476.
What a healthy reading looks like
Voltage should be between 0.5V and 4.5V for accurate operation.
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 wiring and connectors for damage or corrosion between the brake pedal position sensor and the ECM. Repair any issues found. DECISION: If wiring is good, go to step 2; if damaged, fix it and recheck for the code.
- 22. Measure the voltage at the brake pedal position sensor connector with the key on and engine off. You should see a voltage around 0.5V to 4.5V. DECISION: If out of range, replace the sensor; if within range, go to step 3.
- 33. With the engine running, re-check the voltage at the sensor under braking action. It should vary between 0.5V and 4.5V as you apply the brake. DECISION: If it doesn't change as expected, replace the sensor; if it does, check the ECM and related circuits.
Common causes
- Faulty brake pedal position sensor
- Wiring issues (frayed/broken wires)
- Poor electrical connections at the sensor or ECM
- Corrosion or dirt in the connector
- Faulty ECM
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's moderate severity; you might experience reduced braking performance or stability. Fix soon.
Will this code come back after clearing?
If the underlying issue isn't fixed, it's likely to return after clearing the code.
Why do I see this code with other codes?
Brake pedal position is critical for multiple systems, so failures can affect various functions, leading to multiple codes.
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