C0042 code meaning
Brake Pedal Position Sensor Circuit A
What C0042 means
Covers circuit A of the brake pedal position sensor, which reports how far the pedal is pressed rather than just on/off like a switch. The brake or stability module uses this analog signal for brake-by-wire assist, regenerative braking blending and precise stop-lamp and cruise control. The module sets the code for a signal outside the valid voltage range, an open or short, or a value that disagrees with the pedal switch or a second sensor channel. Chrysler documents C0042 on 2015-2017 Durango and Grand Cherokee alongside P0572, with the brake lamps remaining lit or cruise control failing to engage, and prescribes checking and relearning the pedal rest position. A fault can disable assist and cruise functions and set a warning lamp.
C0042 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.4 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0042
- Brake lights stay on
- Cruise control will not set
- ABS or brake warning lamp on
Common causes of C0042
- Most likelyPedal position sensor out of range
- PossiblePedal home position not learned
- Less likelyHarness or connector fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Brake pedal position sensor
What each part of C0042 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 42 | The exact fault in that area. |
What to do next
- Note C0042 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about C0042
What does C0042 mean?
C0042 means "Brake Pedal Position Sensor Circuit A". Covers circuit A of the brake pedal position sensor, which reports how far the pedal is pressed rather than just on/off like a switch. It is a generic code, so it means the same on every make.
Is it safe to drive with C0042?
Drive gently and only to a workshop. With C0042 the car can go into limp mode (reduced power) to protect itself.
Will C0042 fail an emissions test?
C0042 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is C0042 to fix?
Difficulty: medium. A typical repair takes 0.4 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0042 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.