EPS Motor Position Sensor Signal Loss
Code C1442 indicates that the Electric Power Steering (EPS) control unit is not receiving the phase B signal from the motor position sensor (resolver). This sensor is critical for determining the rotor's angular position, which the ECU uses to calculate the correct amount of steering assist. Without this signal, the ECU cannot precisely control the EPS motor, and the system typically disables power assist as a safety measure.
1. Commonly Affected Makes
2. Most Common Causes
- Faulty motor position sensor (resolver) inside the EPS rack
- Open, short-to-ground, or short-to-battery in the sensor wiring or connector
- Loose or corroded connections at the EPS ECU or motor connector
- Internal failure of the EPS ECU
- Mechanical damage to the rack or column affecting the sensor rotor
3. Symptoms You Will Notice
- Steering becomes very heavy or stiff
- EPS warning light illuminated on the dashboard
- Loss of power steering assist
4. Step-by-Step Diagnosis
Scan for additional codes and check freeze frame data
Visually inspect the EPS wiring and connectors for damage, corrosion, or looseness
Test the resolver sensor circuits for continuity, shorts, and proper voltage reference
If wiring is OK, replace the EPS rack assembly (includes resolver) or the EPS ECU as per manufacturer procedure
5. Frequently Asked Questions
Is it safe to drive?▼
No, it is not safe to drive. The power steering assist will be disabled, making the vehicle difficult to steer, especially at low speeds. This increases the risk of an accident.
How much does it cost to fix?▼
Repair costs typically range from $800 to $2,500, depending on whether the EPS rack assembly or ECU needs replacement, and labor rates.