Park Brake Control Signal Circuit Low
The park brake control signal circuit is reading a low voltage condition.
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 computer thinks the signal from the park brake control is too low, which can mean a problem with the wiring or the switch itself.
What the computer is actually seeing
The vehicle's computer expects to see a voltage between 0.5V to 5.0V when the park brake is engaged. When the signal drops below 0.5V, it triggers this code.
What a healthy reading looks like
Expected voltage for a properly functioning park brake signal is 0.5V to 5.0V when the brake is applied.
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.
- 1Inspect the wiring and connectors going to the park brake switch for any visible damage or corrosion.
- 2With the park brake engaged, use a multimeter to check the voltage at the switch; it should be between 0.5V and 5.0V.
- 3If the voltage is low, trace the wiring back for damage; if intact, test or replace the park brake switch.
Common causes
- Damaged wiring or connectors in the park brake circuit
- Faulty park brake switch
- Corrosion in the connectors
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable but be sure your park brake works as intended; don't ignore it.
Will this code come back if I clear it?
If the underlying issue isn't fixed, yes, it will likely return.
Why do I see this code pop up with SPN 703?
SPN 703 often pairs with park brake issues; it relates to the brake system and can indicate a common fault.
Working a real vehicle right now?
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