P05BA: Restraint Deployment Signal Circuit High

After a crash the restraint control module tells the engine module that airbags or belt tensioners have fired; the engine module then cuts the fuel pump (Ford: until the ignition is cycled) and possibly the engine. Depending on the maker the message travels over CAN and/or a dedicated wire with a defined level or voltage drop. P05BA means the signal line stays above its valid range – a short to battery or ignition voltage, or with a pull-up in the engine module an open circuit. The fuel cut-off may then not work via this line. No manufacturer document available to us uses this code; it is a safety function, not an emission-relevant monitor, so usually without warning lamp.

Medium severity. Can I keep driving?If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.

Symptoms

Code stored
Vehicle drives normally
No check engine light

Most likely causes

Signal wire shorted to battery or ignition voltage
Open circuit with pull-up in the engine module
Retrofitted loads or harness damage after accident repair
Restraint or engine module

What to check, in order

Start with the simplest. You can tick off each step.

Check the battery, connectors, and wiring
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Read the live data with a scanner
Follow the manufacturer's service manual

Good to know

Repair difficulty: medium

What each character of P05BA means

P: Powertrain: engine and transmission
0: Generic code: same on every make
5: Speed and idle
BA: Specific fault in that system

Frequently asked questions

Can I keep driving with code P05BA?

If the car is running normally, drive in moderation to a repair shop. If it loses power or another warning appears, do not continue.

What causes code P05BA?

The most common causes are: signal wire shorted to battery or ignition voltage; open circuit with pull-up in the engine module; retrofitted loads or harness damage after accident repair.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.