What does it mean?
U1037 is a Network (CAN bus, module communications) fault code. It indicates: Data Circuit Message .
Symptoms
- ABS and stability control lamps on, often together with the traction control lamp
- Speedometer or odometer readings erratic, low or frozen
- Traction and stability control unavailable or intervening at the wrong moment
- Cruise control refusing to set or cancelling by itself
- Automatic transmission shifting harshly because it lacks reliable speed data
- Fault appearing only once the vehicle exceeds a certain speed
Likely causes
- Wheel speed sensor circuit fault, so the transmitting module has no valid wheel data to send
- Damaged reluctor ring or a sensor clogged with metal debris
- Open circuit, high resistance or a short on the serial data line between the sending and receiving modules
- Corroded connector at the brake or chassis control module that originates the message
- Poor ground on the transmitting module, distorting the data it sends
- Mismatched tyre sizes or a fitted temporary spare, making wheel data implausible
- Software or configuration mismatch after a wheel speed related component or module was replaced
How to fix it
- Watch all wheel speed values in live data during a road test and identify any that disagree with the others
- Inspect each wheel speed sensor, its air gap, the reluctor ring and the connector at the wheel arch
- Check the sensor harness where it flexes near the suspension for chafing and internal breaks
- Confirm tyre sizes match on all corners and remove any temporary spare before retesting
- Test the serial data circuit between the transmitting and receiving modules for continuity and shorts
- Clean and reseat the connectors on the transmitting module and do a voltage drop test on its ground
- Verify module configuration and software after any recent component replacement
- Repair the wiring or replace the failed sensor as the tests indicate, then clear codes and confirm the data is now plausible