94B5

What the Code Means

94B5 flags a faulty signal from the steering angle sensor. The sensor sits in the SZL module (the electronic unit on the steering column) and feeds the current steering angle to the DSC and ABS modules — those systems need this data for stability control and traction control. A common cause is contamination on the sensor or failure of the component itself. When the signal drops out or turns implausible, the control module loses track of where the wheel is pointed and shuts off the functions that depend on that data.

Symptoms

• DSC fault indicator on the instrument cluster.
• ABS warning light on.
• Traction control warning.

All three are linked: without a valid steering angle signal, DSC, ABS, and traction control drop into fail-safe mode.

Diagnosis and Repair

1. Read the fault codes with diagnostic equipment (ISTA, INPA) and note any companion codes — they help separate a sensor failure from wiring or SZL power supply problems.
2. Clean the steering angle sensor — contamination is a frequent cause of an implausible signal.
3. If cleaning doesn't restore a correct signal, replace the SZL as a unit, since the sensor is built into that module.
4. Calibrate the steering angle sensor after service or replacement — without it, the control modules won't accept the signal as valid.

Secondary Problems

• Loss of DSC and ABS function — the car runs without stability control and anti-lock brakes, which cuts safety during emergency braking and on slippery surfaces.
• Progressive SZL module failure if the root cause is component degradation rather than contamination.