C0037 code meaning
Left Rear Wheel Speed Sensor
What C0037 means
Covers the left rear wheel speed sensor and its circuit, the rear-axle counterpart of C0031 and C0034. The active sensor reports rear wheel rotation to the ABS/ESC module for anti-lock, traction and stability control and electronic brake-force distribution. The module monitors the circuit for opens, shorts to power or ground, a signal outside the valid range and a missing signal while moving. Ford documents C0037 on 2020-2022 F-53 motorhome and F-59 commercial chassis, frequently caused by a bent or damaged sensor, and lists it with C003A/C0036 on 2021 Bronco and Ranger. A fault disables ABS, traction and stability control and lights the ABS warning lamp while base braking remains.
C0037 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of C0037
- ABS warning lamp on
- ABS and stability control disabled
- Speedometer may read erratically
Common causes of C0037
- Most likelyWheel speed sensor bent or failed
- PossibleOpen, shorted or chafed sensor wiring
- Less likelyCorroded sensor connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Lr wss
What each part of C0037 means
| C | Chassis system: brakes, ABS, steering and suspension. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 37 | The exact fault in that area. |
What to do next
- Note C0037 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 C0037
What does C0037 mean?
C0037 means "Left Rear Wheel Speed Sensor". Covers the left rear wheel speed sensor and its circuit, the rear-axle counterpart of C0031 and C0034. It is a generic code, so it means the same on every make.
Is it safe to drive with C0037?
Drive gently and only to a workshop. With C0037 the car can go into limp mode (reduced power) to protect itself.
Will C0037 fail an emissions test?
C0037 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 C0037 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will C0037 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.