Conditions for Setting the DTC

P0642

• The ECM detects the 5-volt reference 1 circuit voltage is less than 4.7 volts.
• The above condition is present for 2 seconds.

P0643

• The ECM detects the 5-volt reference 1 circuit voltage is more than 5.2 volts.
• The above condition is present for 2 seconds.