C1240 — ABS Hydraulic Pressure Differential Switch Input Short Circuit To Battery

Q: "Can I drive with this code?"

"It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon."

Q: "Will this code clear itself?"

"Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first."

Q: "How do I find the exact cause?"

"A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component."

What Does C1240 Mean?

C1240 is a diagnostic trouble code indicating: ABS Hydraulic Pressure Differential Switch Input Short Circuit To Battery. This code relates to the chassis system. It has been reported in NHTSA complaints across 1 different vehicle models.

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"TL* THE CONTACT OWNS A 2009 TOYOTA PRIUS. THE CONTACT STATED THAT A WARNING INDICATOR FLASHED ON THE INSTRUMENT PANEL REGARDING THE BRAKE SYSTEM WHEN THE BRAKE PEDAL WAS DEPRESSED. THE CONTACT ALSO NOTICED SMOKE COMING FROM THE EXHAUST SYSTEM. THE CONTACT INSPECTED THE VEHICLE AND FOUND A LEAK UNDER"
— Toyota Prius owner, 09/15/2018

Source: NHTSA Complaints Database

Most Reported Vehicles for C1240

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	TOYOTA PRIUS

Frequently Asked Questions

Can I drive with this code?

It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon.

Will this code clear itself?

Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first.

How do I find the exact cause?

A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

C1240: ABS Hydraulic Pressure Differential Switch Input Short Circuit To Battery