C056D: Brake Pedal Position Sensor Supply Voltage Circuit Low

Severity

High

System

Chassis

Last reviewed: Jan 1, 0001 Last updated: Jan 1, 0001

Methodology: We combine code standards with complaint and reliability patterns, then review for clear, vehicle-first diagnosis steps.

Sources: SAE/OBD-II definitions, manufacturer service information, and public reliability reports (including NHTSA where applicable).

Limits: Guidance is informational and may not match every model-year or revision. Confirm with the official manual and diagnostics before replacing parts. For safety-critical or electrical work, use a qualified technician.

What Does C056D Mean?

C056D is a diagnostic trouble code indicating: Brake Pedal Position Sensor Supply Voltage Circuit Low. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C056D

⚠️ Check Engine Light (MIL) illuminated
⚠️ Brake Pedal Position Sensor Supply Voltage reading at zero or minimum value
⚠️ Related system not functioning or in fail-safe mode
⚠️ ABS or stability control warning light

Common Causes

🔍 Open or broken wire in Brake Pedal Position Sensor Supply Voltage circuit
🔍 Poor ground connection at Brake Pedal Position Sensor Supply Voltage
🔍 Faulty Brake Pedal Position Sensor Supply Voltage with no output signal
🔍 Disconnected or loose Brake Pedal Position Sensor Supply Voltage connector
🔍 Blown fuse in related circuit

Frequently Asked Questions

What does C056D mean?

C056D indicates: Brake Pedal Position Sensor Supply Voltage Circuit Low. The vehicle's computer has detected that the Brake Pedal Position Sensor Supply Voltage is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C056D?

Only short distances if absolutely necessary. C056D affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C056D?

Repair costs for C056D typically range from $20 to $400, depending on the root cause. Simple wiring or connector repairs are on the lower end, while component replacement costs more. A proper diagnosis ($80–$150 at most shops) will identify the exact cause before committing to expensive parts.

What To Do Next

Possible Fixes

🔧 Repair broken wire or restore ground in Brake Pedal Position Sensor Supply Voltage circuit
🔧 Clean and secure Brake Pedal Position Sensor Supply Voltage connector and ground points
🔧 Replace failed Brake Pedal Position Sensor Supply Voltage

1
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2
Check for recalls
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

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