Park Assist Switch Input Circuit Low
The park assist switch circuit has detected a low signal condition.
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What it means (plain English)
The park assist system is getting a signal that's lower than normal from the switch, meaning it might think the vehicle is in a different state than it really is.
What the computer is actually seeing
The computer sees a voltage drop on the park assist switch input when it should be around 5V. Instead, it's reading a voltage below 0.5V intermittently or continuously when the switch is active.
What a healthy reading looks like
The park assist switch should show 5V when engaged and close to 0V when disengaged. Any continuous reading below 0.5V indicates a fault.
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 connectors going to the park assist switch. Look for corrosion or broken wires.
- 22. Check the park assist switch with a multimeter. It should show around 5V when pressed. If not, replace the switch.
- 33. If switch tests good, use a scan tool to check for any other related codes that might explain the low signal.
- 44. If no other codes, check the BCM input with a multimeter when the switch is engaged. Should see an appropriate voltage change.
- 55. If BCM isn't receiving correct input, consider replacing the BCM.
Common causes
- Faulty park assist switch
- Wiring issues (shorts or opens)
- Corroded connectors
- Faulty Body Control Module (BCM)
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
Yes, but be cautious of any parking assistance features that may not work properly.
Will the code come back after clearing?
If the issue isn't resolved, it will likely return once the conditions are met again.
Why did this code appear with another unrelated code?
It's common for multiple codes to relate to the same system; check for related issues in the circuit or module.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
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