DTC code
C1241
ABS Hydraulic Pressure Differential Switch Input Short Circuit To Ground
Technical guide
Symptoms
- ABS warning light
- traction control light
- brake warning light and/or check engine light illuminated
- traction control
- stability control and ABS may be disabled
- vehicle may fail to start or stall randomly
- flickering or dimming headlights
- erratic gauge readings
- power steering may feel heavy or notchy.
Probable causes
- Most likely to least likely: weak or aging battery unable to maintain a steady state of charge (internal resistance increases with age, causing voltage fluctuations under load)
- charging system fault - faulty alternator diodes
- worn brushes or bearings
- bad wiring or loose connections in the power source circuit
- internal power supply circuit fault in the skid control ECU.
Diagnostic steps
- Read all stored codes with a scan tool and note freeze frame data.
- Measure battery voltage with a multimeter and load-test the battery.
- Perform a charging system test: measure alternator output voltage with the engine running.
- Inspect battery terminals, ground straps and power source circuit wiring/connectors to the skid control ECU for looseness or corrosion.
- If battery and charging system test good and wiring is intact, suspect the internal power supply circuit of the skid control ECU.
- Clear the code and confirm it does not return.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
Models most reported with this code (NHTSA)
Count of distinct owner complaints mentioning the code. US data — same engines, same failures.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on C1241
Nothing confirmed yet for this code. No guess is offered on purpose.
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