P0040
Powertrain Codes
P0040 - CHRYSLER - 1/1 And 2/1 O2 Sensor Harness Connectors Reversed
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
- 1/1 And 2/1 O2 sensors harness circuit shorted - 1/1 And 2/1 O2 sensors harness circuit connectors (wrong connection) - Faulty Powertrain Control Module (PCM)
Description
At ignition on the Powertrain Control Module (PCM) checks the voltage on the ground side of the O2 sensor harness connector. If voltage is higher than two volts the P0040 code will set.