Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic Trouble Code (DTC) Information
2004 Volvo V70 L5-2.4L VIN 64 B5244S6SECTION Diagnostic Trouble Code (DTC) Information
Diagnostic trouble code (DTC) information ECM-941C
Condition
The engine control module (ECM) checks and compares the signal from the brake position sensor with position of the brake light switch.
Hint: The brake pedal position sensor's signal is sent to engine control module (ECM) from brake control module (BCM) via CAN.
If engine control module (ECM) registers values from the brake position sensor that are incorrect, unreasonable, or do not match the position of the brake light switch, the diagnostic trouble code is generated.
The diagnostic trouble code can be diagnosed when the ignition is on.
Substitute value
- The cruise control is disengaged when the malfunction is active
Possible source
- Contact resistance in connections to the brake position sensor.
- Incorrectly installed brake light switch.
- Defective brake light switch.
- Incorrectly adjusted brake light switch.
- Damaged brake position sensor.
Fault symptom[s]
- Cruise control does not function at all.
- Brake light constantly on.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.