1, 2 and 3 Digit Codes: 59

Scan Tool 59 (MIL 16):

Trouble Code Number
- Scan tool 59
- General scan tool P0325
- MIL 16

Fault Message
- Knock Sensor #1 Circuit

Background
- The sensor consists of a piezoelectric material that constantly vibrates, sending a voltage signal to the PCM when the engine is operating.
- When the signal exceeds a threshold, the PCM retards engine ignition timing to reduce knock.

Set Condition
- Knock sensor signal below minimum acceptable threshold voltage.
OR
- Knock sensor output voltage is above 5.0 Volts.

Probable Cause
- Knock sensor failed
- Open or shorted knock sensor circuit
- PCM failed