C1241: ABS Hydraulic Pressure Differential Switch Input Short Circuit To Ground
What Does C1241 Mean?
C1241 is a diagnostic trouble code indicating: ABS Hydraulic Pressure Differential Switch Input Short Circuit To Ground. This code relates to the chassis system. It has been reported in NHTSA complaints across 6 different vehicle models.
Symptoms of C1241
- ⚠️ Engine misfires
Common Causes
- 🔍 Torque converter malfunction
- 🔍 Turbocharger or boost system issue
- 🔍 Sensor or control module malfunction
C1241 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"Safety issue: The vehicle experiences intermittent loss of acceleration and transmission “slip/rev” events, especially when cold, from a stop, or at low speed. At times, the vehicle revs as if in neutral, then re-engages. The driver sometimes must press the accelerator fully to gain speed. In one in"
— Toyota Rav4 owner, 11/28/2025
"CODE C1241: LOW OR HIGH POWER SUPPLY VOLTAGE CODE C1422: MASTER CYLINDER PRESSURE SENSOR ZERO POINT HIGH CODE P0304: CYLINDER 4 MISFIRE DETECTED CODE P0304: CYLINDER 4 MISFIRE DETECTED CODE P0304: CYLINDER 4 MISFIRE DETECTED CODE P0304: CYLINDER 4 MISFIRE DETECTED CODE P0304: CYLINDER 4 M"
— Toyota Tacoma owner, 11/24/2018
"On approx. August 13, 2021, my 2008 Toyota Highlander Hybrid vehicle began making grinding sounds when the brake is fully depressed while the transmission lever is set to "drive". On approx. August 20, 2021, my vehicle started showing 4 error messages on the display: Brake Malfunction, Check ABS, C"
— Toyota Highlander owner, 08/20/2021
Source: NHTSA Complaints Database
Most Reported Vehicles for C1241
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | TOYOTA HIGHLANDER | |
| 2 | TOYOTA PRIUS | |
| 3 | TOYOTA RAV4 | |
| 4 | TOYOTA TACOMA | |
| 5 | TOYOTA 4RUNNER | |
| 6 | TOYOTA TUNDRA |
C1241 Reports by Vehicle
Detailed NHTSA complaint analysis for each vehicle model.
Frequently Asked Questions
Can I drive with this code?
Will this code clear itself?
How do I find the exact cause?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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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.