C0662 means the ABS control module has detected a voltage higher than expected on the signal circuit of the left rear wheel speed sensor B. This usually indicates an electrical fault in the sensor, its wiring, or the module's input.
The sensor may have an internal short to power, causing a high voltage reading on its signal circuit.
Damaged insulation or chafed wiring can allow the sensor signal wire to contact a 12‑V source, raising the measured voltage.
Moisture, corrosion, or a poor connection can increase resistance or create a false high voltage condition.
If the tone wheel is damaged or the sensor is mounted too far away, the sensor may output a spurious high signal.
Internal failure of the module’s input stage for that sensor can cause it to read a constant high voltage.
Although sometimes suggested, the powertrain control module is very unlikely to be the cause; only consider after all sensor, wiring, and ABS module checks are exhausted.
No. The PCM/ECM is rarely at fault for this code; the issue is almost always in the wheel speed sensor, its wiring, or the ABS module. Replace the PCM only after those components have been tested and found good.
You can drive, but ABS and traction control may be disabled or behave unpredictably, which can increase stopping distance on slippery surfaces.
Clearing only removes the warning; if the underlying fault remains, the code will return after the next self‑test.
A damaged tone wheel or excessive air gap can cause erratic sensor signals, but wiring and sensor faults are more frequent.