You can test both the knock sensor and the circuit wiring with an ohmmeter. Refer to the service manual for your vehicle's sensor and circuit resistance specifications.

Thus, with an ESC system a knock sensor is employed. The purpose of this primer is to establish methods to eliminate or minimize evoking the knock sensor circuit.

Repairing the connection to the knock sensor circuit can cost anywhere from $50 to $500, while updating the ECM may not cost you anything at all if you have it done at a dealer.