C0042 — Brake Pedal Position Sensor Circuit A

What Does C0042 Mean?

C0042 is a diagnostic trouble code indicating: Brake Pedal Position Sensor Circuit A. This code relates to the chassis system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

Symptoms of C0042

⚠️ Check Engine Light (MIL) illuminated
⚠️ Erratic Brake Pedal Position Sensor readings
⚠️ Related system operating intermittently
⚠️ ABS or stability control warning light

Common Causes

🔍 Wiring issue in Brake Pedal Position Sensor circuit (damaged, chafed, or corroded)
🔍 Faulty Brake Pedal Position Sensor connector or terminal
🔍 Failed Brake Pedal Position Sensor
🔍 ECM/PCM connection issue

Frequently Asked Questions

What does C0042 mean?

C0042 indicates: Brake Pedal Position Sensor Circuit A. The vehicle's computer has detected that the Brake Pedal Position Sensor is not operating within its expected parameters and stored this diagnostic trouble code.

Can I drive with code C0042?

Only short distances if absolutely necessary. C0042 affects a critical system and should be diagnosed within a few days to avoid further damage.

How much does it cost to fix C0042?

Repair costs for C0042 typically range from $100 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

🔧 Inspect and repair Brake Pedal Position Sensor wiring and connectors
🔧 Replace faulty Brake Pedal Position Sensor

1
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2
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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.

C0042: Brake Pedal Position Sensor Circuit A