P0653 Sensor Reference Voltage 2 Circuit High

P0653 code - The primary  5-volt supply circuit supplies the Camshaft Position Sensor (CMP), Camshaft position sensor 2 MAP sensor, and accelerator pedal position (APP) sensor 2. 

For self protection, if the 5-volt supply circuit is shorted to ground or if one of the sensors is internally shorted, the Powertrain Control Module (PCM) will turn off the 5-volt supply circuit until the next ignition cycle. Set condition this DTC when the Powertrain Control Module (PCM) recognizes the secondary 5-volt supply circuit voltage is too high, one trip fault. ETC light is flashing.

Possible causes P0653 code

- 5-volt supply shorted to voltage
- 5-volt supply shorted to voltage
- Powertrain Control Module (PCM)

Diagnose P0653 code

Step 1. Active DTC
Improperly installed aftermarket accessories can cause this DTC to set. Check for any improperly installed aftermarket accessories before continuing with this test. Turn the ignition on for at least 60 seconds, with a scan tool read the active DTCs.

Is the DTC active at this time?

Yes, go to step 2.

Step 2. Check the 5-volt supply circuit and the 5-volt supply circuit for a short to voltage
Turn the ignition off, disconnect all the sensors that share the 5-volt supply circuit. Disconnect the APP sensor harness connector. Ignition on engine not running, measure the voltage on the 5-volt supply circuit at the CMP sensor harness connector.

Is the voltage reading above 5.2 volts?

Yes, repair the 5-volt supply circuit or the 5-volt supply circuit for a short to voltage.
No, go to step 3.

Step 3. Powertrain Control Module (PCM)

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